OPERATOR’S MANUAL FOR ARMY CH-47D HELICOPTER (EIC: RCD, 2003)

TM 1-1520-240-10

(2)

Several beeps will be heard in the headset.

(1)

Continuous beeping, with background

This means that the old CNV is being replaced by a new

noise, is a crypto alarm. This occurs when power is first

CNV..

applied to the KY-58 or when the KY-58 is zeroized. This

beeping is part of normal KY-58 operation but must be

(3)

Using this new CNV, the net controller will

cleared by momentarily keying the No.1 VHF AM/FM

Radio before communications can be achieved.

ask for a radio check.

(2)

Background noise indicates that the KY-58

(4)

After the radio check is completed, the net

is working properly. This noise should occur at power on

controller instructions will be to resume normal commu-

of the KY-58 and when the KY-58 is generating a crypto-

nications. No action should be taken until the net control-

variable. If the background noise is not heard at power

ler requests a radio check.

on, the equipment must be checked out by maintenance

personnel.

d. Manual remote keying procedures. The net con-

troller will make contact on a secure voice channel with

(3)

Continuous tone should indicate a parity

instructions to stand by for a new CNV by a manual

alarm. This will occur whenever an empty storage regis-

remote keying (MK) action. Upon instructions from the

ter is selected while holding the PTT button in. This tone

net controller:

can mean any of three conditions:

(1)

Set the FILL switch to position 6. Notify the

(a) Selection of an empty storage register.

net controller by radio and stand by.

(b) A bad cryptovariable is present.

(2)

When notified by the net controller, set the

MODE switch to RV (receive variable). Notify the net

clear this tone, follow the loading procedures in TM

controller and stand by.

11-5810-262 -OP. If this tone continues, have the equip-

ment checked out by maintenance personnel.

(3)

When notified by the net controller, set the

FILL switch to any storage position selected to receive

(4)

Continuous tone could also indicate a crypto

the new CNV (may be unused or contain the variable

alarm. If this tone occurs at any other time other than in

being replaced). Notify the net controller and stand by.

(3) above, equipment failure may have occurred. To clear

this tone, repeat the loading procedures in TM

11-5810-262 -OP. If this tone continues, have the equip-

NOTE

ment checked out by maintenance personnel.

When performing step (3), the storage posi-

(5)

Single beep, when DELAY switch is

tion (1 through 6) selected to receive the new

down(not selected), can indicate any of three normal

CNV may be unused or it may contain the

conditions.

variable which is being replaced.

(4)

Upon instructions from the net controller:

(a) Each time the PTT button is pressed

when the KY-58 is in C (cipher) and a filled storage regis-

(a) Listen for the beep on your headset.

ter is selected, this tone will be heard. Normal use

(speaking) of the KY-58 is possible.

(b) Wait two seconds.

(b) When the KY-58 has successfully re-

ceived a cryptovariable, this tone indicates that a good

cryptovariable is present in the selected register.

(d) Confirm.

sion, this tone indicates that the received signal is in a

(5)

If the MK operation was successful, the net

secure voice.

controller will now contact you via the CNV.

(6)

A single beep, when the DELAY switch is up

(6)

If the MK operation was not successful, the

(time delay) occurring after the preamble is sent, indi-

net controller will contact you via clear voice (plain) trans-

cates you may begin speaking.

mission, with instructions to set your FILL selector switch

to position 6 and stand by while the MK operations re-

(7)

A single beep, followed by a burst of noise

peated.

and a seemingly dead condition, indicates that your re-

ceiver is on a different variable than the distant transmit-

e. It is important to be familiar with certain KY-58

ter. If this tone occurs when in C/RAD1: Turn FILL switch

audio tones. Some tones indicate normal operation while

to the CNV, Plain-Cipher switch to PLAIN and contact the

others indicate equipment malfunction. These tones are

transmitter in clear text and agree to meet on a particular

heard only in the cipher mode and are:

variable.

3-2-15

TM 1-1520-240-10

3-2-21. HF Radio Set (AN/ARC-220).

Data Connector (6)

Interfaces ARC-220 system to

data transfer device for datafill.

WARNING

Key Connector (7)

Interfaces ARC-220 system to

data transfer device for keyfill.

ANTENNA DANGERS

Mode Switch (8)

Five position rotary switch se-

The HF Radio Liaison Facility AN/ARC-220

lects mode of operation.

in the ALE mode sounds (transmits short

MAN

Selects HF conventional com-

tone bursts) and replies to ALE calls auto-

munications. Operating fre-

matically without operator action. Anytime

quency and emission mode

local flight directives forbid HF emissions,

are selected manually. Se-

such as during ordinance loading and re-

lected information can be

fueling, or when personnel are working

stored in preset channels for

near the aircraft, ensure the radio set con-

future recall.

trol function switch is set to SILENT, STBY,

or OFF.

PRE

Selects conventional HF com-

The HF radio set (AN/ARC-220) provides communica-

munications. Channel/net se-

tions in a 28 MHz high frequency band between 2.0 and

lector is used to select prepro-

29.9999 MHz. Channels are spaced at 100-Hz incre-

grammed preset channel. Fre-

ments, giving 280,00 possible frequencies. Preset chan-

quency and emission mode

nels can be manually programmed or preprogrammed

cannot be changed during pre-

as part of the communications mission load information.

set operation.

A total of 72 channels can be programmed: 20 manual

simplex or half-duplex, 20 programmable simplex or half-

ALE

Selects automatic link estab-

duplex, 20 programmable ALE scan lists and 12 pro-

lishment mode of operation.

grammable ECCM hop-sets (with ALE capability). Oper-

ECCM

Selects electronic counter-

ating modes of the HF radio set using either simplex or

countermeasure mode of op-

half-duplex operation are Upper and Lower sideband

eration.

(USB, LSB), amplitude modulation equivalent (AME),

and continuous wave (CW). Data may be transmitted or

EMER

Used during emergency to

received in USB or LSB modes. Both standard and ad-

place a distress call. The

vanced narrow-band digital voice terminal (ANDVT) are

mode, frequency, net, etc., is

supported. DC power to operate the HF radio set is sup-

determined by the datafill.

plied by the No. 2 DC bus through the COMM ARC-220

HF circuit breaker on the No. 2 PDP.

SQL (9)

Two pushbutton switches

which controls squelch and au-

3-2-22. Controls and Function, HF Radio Set (AN/

dio muting.

ARC-220). (fig. 3-2-8)

VOL (10)

Eight-position rotary switch

CONTROLS/

FUNCTION

varies the receive audio output

INDICATOR

level.

Cursor (1)

Four pushbutton switches

Function Switch

Five-position rotary switch se-

position the cursor verticallyor

(11)

lects system operation func-

horizontally.

tion.

Line-Select (3)

Pushbutton switches to select

options displayed to left of

OFF

Turns the ARC-220 off.

each switch.

STBY

Selects the standby function

Brightness (4)

Pushbutton switches to vary

where built-in test (BIT), setup,

display brightness.

or fill operations can be per-

formed.

Channel/Net Selec- Seven-position rotary switch

tor (5)

used to select programmed

SILENT

Used in ALE or ALE ECCM

operating channels or nets.

modes to prevent the ARC-220

CONTROLS/

FUNCTION

from automatically responding

INDICATOR

to incoming calls.

3-2-16

TM 1-1520-240-10

CONTROLS/

FUNCTION

CONTROLS/

FUNCTION

INDICATOR

Line 3

T/R

Allows the ARC-220 to trans-

mit and receive in the selected

Receive Frequency

Numeric display (2.0 to

mode of operation.

29.9999 MHz) with a display

format of RCV xx.xxxx.

ZERO

Erases all data (including data-

fill and keyfill) which has been

ECCM Station Type

Character display (MEMBER,

loaded into the system.

ALTERNATE, MASTER, NET

ENTRY, ALT NET ENT). De-

Value (12)

Two pushbutton switches in-

fault is MEMBER.

crements a field value or single

Lines 3, 4

Character display of emission

character value, depending on

mode (USB, LSB, AME, CW)

cursor position.

one space to right of frequen-

cy. Default is USB.

Line 4

3-2-23. Display Lines, HF Radio Set (AN/ARC-220).

Transmit Frequency

Numeric display (2.0 to

29.999 MHz) with format of

The information displayed on each line is dependent

XMT xx.xxxx.

upon the operation being performed. This section speci-

fies what information can be displayed on each particular

Time

Numeric display (00:00:00 to

line.

23:59:59) with a format of -

Hour:Minute:Second.

CONTROLS/

FUNCTION

Line 5

INDICATOR

Link Protection

Character display (OFF, ON)

Line 1

Alpha-numeric display of 15

with a format of - LINK

characters maximum contain-

PROT: xxx. Default is ON

ing channel title (call sign).

(OFF if no link protection da-

Default value - Mode: chan-

nel#

tafill.

Line 2

Date

Alphanumeric display (01

JAN 00 to 31 DEC 99) with

ALE Address

Alpha-numeric display of 15

format of - dd MM yy.

characters maximum contain-

ing the Call To (ADRS: xxx)

Antenna Type

Character display (T/R, RCV)

or Self (SELF: xxx) Addresss.

with format of - ANT: x xx.

(ADRS:) and (SELF:) labels

Default is T/r.

are removed for addresses

greater than 10 characters in

Line 6

length.

Power Level

Character display (LOW,

Noise Reduction

Character display (ON, OFF)

MED, HIGH) with format of -

having a display format of -

PWR: xxxx. Default is HIGH.

NOISE REDUCE: xxx. De-

Squelch

Alpha-numeric display

fault value is ON.

(TONE, 0 to 5) with format of

Fill Type

Character display (KEY,

- SQ: xxx.

DATA) having a display For-

Volume

Numeric display (1 to 8) with

mat - TYPE: xxxx x. Default

is DATA.

format of - VOL: x.

Contention Control Character display (ON, OFF)

Listen Before Talk

Character display (ON, OFF)

having a display format of -

with format of - LBT: xxx. De-

LBC: xxx. Default is OFF.

fault value is OFF.

3-2-17

TM 1-1520-240-10

3-2-24. Operating Modes/Functions, HF Radio Set

CONTROLS/

FUNCTION

(AN/ARC-220). (fig. 3-2-8)

INDICATOR

Receive/Transmit

2.0 - 29.9999 MHz, program-

CONTROLS/

FUNCTION

Frequency

mable in 100 HZ steps. To

INDICATOR

change frequencies, depress

the EDIT line select switch.

Power ON/OFF

On function Switch.

While in the Edit screen use

the Cursor switches to posi-

CRT Brightness

Two pushbuttons switches

tion cursor under the ap-

used to vary brightness. The

propriate frequency. Use the

↑ (up arrow) increases inten-

VALUE switches to change

sity while the ↓ (down arrow)

frequency. (Note: The XMT

decreases intensity.

frequency will automatically

change with the RCV fre-

System Turn-On

Turning the Function Switch

quency, but the reverse is not

clock-wise from OFF to

true).

STBY turns system on and

selects standby function.

Squelch Level/ Audio

Two pushbutton switches

SYSTEM TESTING is dis-

Muting

-SQL +, when pressed dis-

played while power-up BIT

plays the squelch status on

(P-BIT) is in process. SYS-

line 6 of display for 5 se-

TEM -GO will be displayed if

conds. Settings are TONE

all tests good, SYSTEM-

and 0 through 5. TONE pro-

NOGO if not.

vides no muting and no

squelch. Position 0 provides

Audio Volume

Eight-position rotary switch

muting but no squelch. Posi-

varies output level. Setting is

tions 1 through 5 provide

muting and increasing levels

displayed on line 6 (bottom)

of squelch. Muting is normal-

of display for 5 seconds

ly enabled during ALE and

when system first turned on

ALE ECCM operation.

or when VOL setting is chan-

ged. The display level are 1,

Output Power Level

Three output levels are se-

2, 3 thru 8.

lectable for the display

screen by using the EDIT

Channel Selection

Channel number may be

line-select switch, which

changed using the Channel

brings up the edit mode,

Selector seven-position

moving the cursor under the

rotary switch. The + position

power character field and us-

of the greater to be selected

ing the VALUE switches to

using the VALUE switch.

change the field. Depress the

Modulation Mode

Four modes are available:

RTN line-select switch which

USB, LSB, AME, and CW. To

stores the change and re-

change modes, depress the

turns to normal operating

EDIT line select switch.

mode. There are two Built-in-

While in the Edit screen use

Test (BIT) features which

the CURSOR switches to

concerns the operator, P-BIT

position cursor under the ap-

and C-BIT. The Power-UP Bit

propriate emission mode

(P-BIT) test the ARC-220

when initially turned on. P-Bit

(RCV or XMT). Use the VAL-

exercise basic radio control

UE switches to change

functions which must be op-

mode. (Note: The XMT mode

erational prior to entering a

will automatically change with

system operational mode. A

RCV mode, but the reverse is

GO/NO/-GO status appears

not true). Depress RTN line

on the display and defaults to

select switch to enter the

standby mode upon comple-

edited data and return to op-

tion. When NO-GO status ap-

erational mode.

pears, depressing the

3-2-18

TM 1-1520-240-10

CONTROLS/

FUNCTION

CONTROLS/

FUNCTION

INDICATOR

INOP line-select switch dis-

Key Fill

Loads secure keys. From

plays INOP MODES so an

STBY screen, press FILL

operator can see if limited ca-

line-select switch. Use VAL-

pability exists. The Continu-

UE switched to select KEY in

ous Bit (C-BIT) is automati-

fill TYPE: field. Connect DTD

cally performed during sys-

to KEY connector on radio

tem operation without any

set cotnrol panel. Use VAL-

operator intervention. Critical

system functions are monito-

UE right arrow switch to se-

red. Any failures cause a NO-

lect key number (1 through 6)

GO advisory, accomplished

to be loaded. Initiate keyfill

by the portion of system

from DTD. LOADING is dis-

which failed, to appear on

played during keyfill, LOAD

line 5 of the display. C-Bit fail-

COMPLETE if successful.

ures are stored in nonvolatile

LOAD FAIL may cause inter-

memory.

ference to other stations. De-

Store

RTN line-select key, used to

fault is ON. LBT: (listed be-

terminate edit mode, auto-

fore talk) - This field is used

matically stores any

for manual, preset, or con-

change(s) made.

ventional (non-ALE) ECCM

operation and turns LBT ON

DataFill

Contains preset frequencies,

scan lists, addresses, data

or OFF. When OFF, transmis-

messages and ALE and/or

sion is accomplished without

ECCM parameters. With sys-

regard to traffic and may

tem in STBY, press the FILL

cause interference to other

line-select switch. Use VAL-

stations. Default is OFF.

UE switches to select DATA

ANT: (antenna) - Useful if

in the fill TYPE: field (line 2).

system uses both receive-

Connect data transfer devise

only and transmit/ receive an-

(DTD) of DATA connector on

tennas.

radio set control front panel

and initiate fill from the DTD.

When T/R is selected, the

LOADING is displayed dur-

system transmits and re-

ing datafill. LOAD COM-

ceives on the same antenna.

PLETE is displayed for suc-

When RCV is selected the

cessful fill, LOAD FAIL dis-

system transmits on one and

played if fill cannot be com-

receives the other antenna.

pleted. (NOTE: using an AN/

Default is T/R

CYZ-10 DTD, the radio set

LINK PROT: (link protection)

control displays DTD DE-

TECTED when DTD is de-

- This field turns ALE link

tected). A copy of loaded da-

protection ON or OFF. De-

tafill can be sent to DTD by

fault is ON (OFF if no link

pressing COPY line-select

protection datafill). Press

switch. COPYING is dis-

RTN line-select switch when

played during operation,

setup edit is complete to en-

COPY COMPLETE displayed

ter all data and return to

if successful, COPY FAIL if

STBY screen.

copy cannot be completed.

Press RTN line-select switch

to return to STBY screen

when datafill is complete.

Disconnect the DTD.

3-2-19

TM 1-1520-240-10

CONTROLS/

FUNCTION

CONTROLS/

FUNCTION

INDICATOR

General Editing

Select desired channel and

as required. Set to desired

press the EDIT line-select

channel. Press microphone

switch. Use the CURSOR

PTT switch, wait until tune

switches to position cursor

tone stops and begin com-

under character position or

munications. When PTT

data field to be edited. Use

switch is pressed, the XMT

VALUE switches to change

frequency is displayed.

the character or data field to

desired value. If available,

Normal ALE Commu- Set function switch to T/R

the data setup can be modi-

nication

and mode switch to ALE.

fied by pressing the DATA

(NOTE: If the selected net is

line-select switch in the EDIT

configured for link protection

screen, using the VALUE

but does not have accurate

switches to scroll through the

time, SYNC instead of POSN

list of modem set configura-

will appear on display, line 2

tion. Press theRTN line-se-

right side along with an UN-

lect switch when all changes

SYNC advisory at bottom of

are complete to store the

screen. An ALE link protec-

changes and return to normal

tion time sync needs to be

operation mode.

performed. If ALE data is not

loaded for the selected scan

Transmit Position

Set function switch to T/R

list, a CHANNEL INOP advi-

Report

and mode switch to proper

sory is displayed). Use - SQL

mode. Press the POSN line

+ switch too set squelch to

select switch. (NOTE: POSN

line-select is available only if

TONE. Adjust VOL for com-

configuration data indicates

fortable listening level. Use -

GPS is installed).

SQL + switch to set squelch

to 0. Headset is muted until a

Manual Operation

Set function switch to T/R

link is established. If channel

and mode switch to MAN.

Use - SQL switch to set

is noisy, adjust squelch. High-

squelch to 0. Adjust VOL

er squelch levels are not rec-

control to comfortable listen-

ommended for ALE mode of

ing level. Use SQL + switch

operation.

to set squelch to 1, the opti-

mum for manual mode. If ra-

Normal ALE

When ALE call is received

dio breaks in and out of

Communication

INCOMING CALL is dis-

squelch, increase as requi-

Receiving

played with the address field

red. Set to desired channel.

displaying xcaller’s ALE ad-

Press microphone PTT

dress. LINKED is displayed

switch, wait until tune tone

and short gong tone sounds

stops and begin communica-

when an ALE link is establi-

tions. When PTT switch is

shed. Communication can

pressed, the XMT frequency

is displayed.

now begin. Proper protocol is

for calling station to make

Preset Operation

Set function switch to T/R

first transmission.

and mode switch to PRE.

Use - SQL switch to set

Normal ALE

Select ALE address to be

squelch to 0. Adjust VOL

Communication -

called by doing a, b, or c:

control for comfortable listen-

Transmitting

a. Set channel/net

ing level. Use SQL + switch

switch to desired prepro-

to set squelch to position 1,

grammed net.

the optimum setting for pre-

b. Use VALUE switch

set mode. If radio breaks in

to scroll through and select

and out of squelch, increase

preprogrammed address.

3-2-20

TM 1-1520-240-10

CONTROLS/

FUNCTION

CONTROLS/

FUNCTION

INDICATOR

c. Press EDIT line-select

ECCM Tune/Sync

Press either TUNE line-select

switch, then use CURSOR

Operation

switch or microphone PTT

and VALUE switches to

switch to initiate combined

manually select an address

tune and sync. TUNING fol-

character-by-character.

lowed by SYNCING is dis-

(NOTE: NET INOP advisory

played during process. Sys-

is displayed if a selected

tem, will return to ECCM

channel or net contains: no

screen without UNTUNED

data or corrupted data; or

and/or UNSYNC advisories if

hardware cannot support the

successful.

selected mode). Press mi-

ECCM Operation

Use -SQL switch to set

crophone PTT switch CALL-

squelch to TONE. Adjust

ING is displayed LINKED is

VOL control for comfortable

displayed with a short gong

listening level. Use SQL +

tone and headset audio is re-

switch to set squelch to 0. If

stored when link established.

channel is noisy, set to 1.

Start transmission. The sys-

Higher settings are not rec-

tem terminates the link and

ommended for ECCM opera-

returns to ALE scanning after

tion.

a period of inactivity (30 sec-

onds typical). GPS position

ECCM Operation -

RCVING PREAMBLE and/or

can also be transmitted by

Receiving Calls

INCOMING CALL is dis-

using the steps above plus

played.

the Transmit Position Report

steps.

ECCM Operations -

Press microphone PTT

Transmitting

switch. Wait for preamble

ALE Link Protection

Press PTT switch or SYNC

tones to cease then begin

Time Sync

line-select switch. System re-

communications. If an ALE/

turns to scan and the net de-

ECCM channel is used,

fault address if sync success-

CALLING is displayed while

ful, but if unsuccessful press

call in process. LINKED is

ABORT line-select switch to

displayed and a short gong

return to ALE screen.

tone sounds, and headset

audio is restored when link

ECCM Net Initializa-

Set function switch to T/R

established. (NOTE: Press

tion

and mode switch to ECCM.

ABRT line-select switch to

(NOTE: If ECCM data or

abort calling process). Call

keys are not loaded for net

initiator should make first

selected, a CHANNEL INOP

transmission. The system ter-

advisory is displayed). Set

minates link and returns to

channel/net switch to desired

scan after a period of inactiv-

net. If selected channel is an

ity (30 seconds typical). GPS

ALE/ECCM channel, the ad-

position can also be trans-

dress of station being called

mitted by using the steps

is displayed on line two.

above plus the Transmit

(NOTE: NET INOP advisory

Position Report steps.

is displayed if selected chan-

nel or net contains: no or cor-

Data Messages

The ARC-220 radio set can

rupted data; or hardware

store up to 10 transmit and

cannot support selected

10 received data messages

mode. If screen displays UN-

up to 500 characters long

TUNED or UNSYNC adviso-

each. Received data mes-

ries proceed with system

sages are stored in memory

Tune/Sync operation, other

and can be retransmitted.

wise proceed with ECCM op-

eration.

3-2-21

TM 1-1520-240-10

CONTROLS/

FUNCTION

CONTROLS/

FUNCTION

INDICATOR

5. To delete messages,

An advisory alerts when a

position cursor under mes-

data message is received.

sage number to delete, press

Data can be transmitted or

the DEL line-select switch

received in any mode (manu-

until NO MESSAGES is dis-

al, ALE, or ECCM). Proce-

played mode.

dure to send/receive (recall)

messages is the same for all

modes, except in manual

Data Messages -

Press SEND line-select

mode when ALE link is not

Transmit

switch to transmit last se-

established.

lected address in ALE or

ECCM mode, or to transmit

message using current mode

Data Messages - Re- Received messages are

and frequency in manual

ceived

stored in MSG location 1.

mode. In ALE or ECCM

MSG 10 is the oldest mes-

modes advisories are dis-

sage and is deleted from

played during tuning, synch-

memory upon receipt of an

ing and linking which is done

incoming message. Received

automatically. SENDING

messages can be read and/

DATA is displayed while

or forwarded, but not edited.

message is transmitted.

A CHECK MSG advisor is

displayed when data mes-

sage received. To recall data

Program/Edit Data

Press MSG line-select switch

messages perform the follow-

Messages

to go to MESSAGE screen,

ing:

then press PGRM line-select

1. Press MSG line-select

switch. NO MESSAGES is

switch to view message. If

displayed if none exists. Use

operator desires to check

the CURSOR up/down ar-

messages even though a

rows to position the cursor,

CHECK MSG advisory was

then use VALUE switches to

nor displayed, press MSG

enter desired data (if a pre-

line-select switch, then

viously programmed mes-

RCVD line-select switch to

sage is to be edited, use

view messages. NO MES-

CURSOR an VALUE

SAGES advisory appears if

switches to obtain appropri-

no messages exists.

ate message and line as de-

2. Use the CURSOR up/

scribed earlier). To delete a

down arrow to view message

character in cursor position

one line at a time and left/

and to shift remaining char-

right arrows to move cursor

acters one position to the left,

to left margin. Use VALUE

press DEL line-select switch.

switches to page up or down.

A built-in word dictionary is

3. To view additional

available (either default or

messages, use CURSOR

filled). To access word dictio-

switches to position cursor

nary, press WORD line-select

under the MSG number the

switch to obtain INSERT

use. VALUE switches to

screen. Use CURSOR and

scroll to next consecutive

VALUE switches to scroll dic-

message number.

tionary. Place cursor under

4. To retain messages in

desired word and press

memory, press RTN line-se-

SELCT line-select switch to

lect switch. Press RTN line-

insert a blank and the se-

select switch to return to op-

lected word at cursor position

erational

of message edit screen or if

no word found, press CANCL

3-2-22

TM 1-1520-240-10

plied by the No. 2 DC bus through the HF KY-100 circuit

CONTROLS/

FUNCTION

breaker located on the No. 2 PDP.

INDICATOR

line-select switch to return to

edit CONTROLS/screen.

3-2-26. Controls, Indicators, Connectors and Func-

When complete, press RTN

tion (TSEC/KY-100-, Z-AVH) (fig. 3-2-9)

line-select switch to load

message into memory and to

return to top-level screen.

Shutdown Procedures Set

CONTROLS/

FUNCTION

function switch to OFF. Gent-

INDICATOR

ly pull and turn function

MODE Switch

Six position rotary switch

switch to zeroize.

used to select one of the op-

(ZERO) position to erase pre-

erational modes.

programmed information, in-

cluding all fills. Zeroize func-

Plaintext mode. Allows re-

tion is operational regardless

ception or transmission of un-

if system is on or off.

encrypted analog voice.

Emergency Commu- The mode used during emer-

Emergency Back-up mode.

nication

gencies is determined by the

Uses the emergency back-up

datafill. The equipment oper-

key to encrypt voice for trans-

ates normally for mode selec-

mission or reception.

ted. Set mode switch to EM-

Ciphertext mode. Allows

ER. Press the PTT switch to

transmission of encrypted

transmit. If in ALE mode, an

voice or data and reception

ALE call is placed to the se-

of encrypted or unencrypted

lected address.

voice or data, and non-coop-

erative terminal rekeying.

Remote Keying mode. Per-

mits KY-100 to perform auto-

matic and manual rekey op-

erations.

OFFLINE

Disables communications

and gives access to the sys-

tem of menus used to select

mode settings, self-test fea-

tures, and filling the KY-100

with crypto-variables.

Z ALL

Zeroize mode. Erase all cryp-

(PULL)

tographic data stored in the

KY-100 except the Emergen-

cy Back-up Key.

CIK Receptacle

Interfaces with a Crypto-

graphic Ignition Key which is

needed to enable all secure

voice and data communica-

Figure 3-2-8. Control/Display Panel, HF Radio Set

tions. This function is cur-

(AN/ARC-220)

rently disabled.

DSPL/OFF BRT

Two-function rotary switch

Control

which controls the on/off sta-

tus and backlight intensity of

3-2-25. Voice Security Equipment TSEC/KY-100.

the LCD display.

PNL/OFF BRT

Two-function rotary switch

Voice security equipment (TSEC/KY-100), when

Control

which controls the on/off sta-

installed, provides two-way clear or secure half-duplex

tus and backlight intensity for

voice/data communication for the HF radio system (AN/

the overall front panel.

ARC-200). Power to operate the TSEC/KY-100 is sup-

3-2-23

TM 1-1520-240-10

CONTROLS/

FUNCTION

CONTROLS/

FUNCTION

INDICATOR

PRESET Switch

Rotary selector switch which

Simultaneous (↑→)

Used to exit a submenu.

controls unit operating power

Display, LCD

Back-lighted Liquid Crystal

and settings which are stored

Display (LCD) indicates op-

in memory.

erational status, operator

prompts and messages.

OFF

Removes power from

KY-100.

3-2-27. Display

Annunciators/Fields

(TSEC/

MAN

Manual position which allows

KY-100, Z-AVH). (fig. 3-2-10)

operating modes to be se-

lected using both OFFLINE

CONTROLS/

FUNCTION

and online menu system.

INDICATOR

1 thru 6

Six separate preset modes

TX Annunciator (1)

Displayed when KY-100 is

which can only be set up in

transmitting.

the OFFLINE mode.

RX Annunciator (2)

Displayed when KY-100 is re-

FILL Connector

Used to load cryptographic

ceiving.

keys through the use of com-

Wb Annunciator (3)

Displayed when KY-100 is in

mon fill devise such as

the Wideband (VINSON)

KYK-13/TSEC Electronic

configuration.

Transfer Devise, KYX-15/

TSEC Net Control Devise,

Nb Annunciator (4)

Displayed when KY-100 is in

AN/CYZ-10 Data Transfer

the Narrowband (ANDVT)

Devise (DTD), or the

configuration.

KOI-1//TSEC General pur-

Eb Annunciator (5)

Displayed when MODE con-

pose Tape Reader.

trol switch is in the Emergen-

Three Button

Momentary pushbutton

cy Backup (EB) position.

Keypad

switches active in both OF-

Alphanumeric

Provides prompts, mes-

FLINE and on-line modes.

Display (6)

sages, and mode indications.

Used to enter and exit sub-

PT Annunciator (7)

Displayed when KY-100 is

menus, activate the selected

processing plaintext voice.

mode, select fields,and to

scroll through menus and op-

Key Symbol (8)

Displayed when menu sys-

tions.

tem is locked.

INIT

Initiate switch. In the OF-

D Annunciator (9)

Displayed when in Data

FLINE mode activates the

mode.

displayed menu mode and

V Annunciator (10)

Displayed when in Voice

provides entry into subme-

mode.

nus. In on-line modes (CT,

Rate Display (12)

3-character display indicates

RK, EB,PT), it selects the dis-

voice or data rate.

play field to be change.

Up Arrow (↑)

In the OFFLINE mode, it is

3-2-28. Turn-On Procedure.

Switch

used to scroll through menus

from top to bottom. In on-line

When the KY-100 is turned on, tests are automatically

modes (CT, RK, EB, PT), it is

performed to determine the equipment’s operating sta-

used to scroll through avail-

tus. The results of these tests will be presented on the

able options for the display

display. Also, a Cld START message will be displayed.

field being changed.

a. Cold start turn-on. (Initiated if no traffic encryption

Right Arrow (→)

In the OFFLINE mode, it is

key (TEK) is contained in the KY-100).

Switch

used to scroll through menus

(1)

Turn on the KY-100 by turning the PRESET

from bottom to top. In the on-

switch to the MAN position.

line modes (CT, RK, EB, PT)

it is used to select the display

(2)

The KY-100 will initiate a self -test. The dis-

field to be changed.

play reads Cld STRT and then PSH INIT.

3-2-24

TM 1-1520-240-10

(3)

Connect a fill devise to the KY-100 fill con-

f. Push the INIT button. LOAD N with a flashing N will

nector using a fill cable. Select the fill position containing

be displayed. The flashing N indicates the currently se-

the valid key and turn it on.

lected key location.

(4)

Press the INIT pushbutton (PUSH INIT).

g. Press the ↑ (up arrow) or → (right arrow) button

until the required location (1, 2, 3, 4, 5, 6, or U) is dis-

(5)

The KY-100 displays KEY 1 01, PASS,

played.

WORKING, LOCKED, READY.

h. Press the INIT button. The entire LOAD N mes-

NOTE

sage will now be flashing.

If a fill devise is not connected to the KY-100

i. Turn on fill devise and select key to be loaded.

when the INIT pushbutton is pressed, a dEV

NOTE

ERR (Devise Error) message will be dis-

played. When this occurs, the only available

DO NOT press the INITIATE pushbutton (or

communication mode will be PT (Plaintext).

pull tape through tape reader) on fill devise.

(6)

If a FAIL message is displayed, notify the

j. Press the INIT button. (When using a KOI-18 pull

next level of maintenance.

tape through tape reader at a steady rate after the termi-

nal INIT button is pressed). Upon completion of a suc-

(7)

To load additional keys (up to a total of 6),

cessful load, a pass tone will be heard and the display will

proceed to Key Loading Section.

momentarily indicate KEY N, where N is the key location

b. Normal turn-on.

loaded.

(1)

Set the front panel MODE control to the OF-

k. The display will again show LOAD N with N fla-

FLINE position.

shing. To load additional keys, repeat steps g. through j.

until all desired key locations have been loaded.

(2)

Rotate the DSPL and PNL switches clock-

l. Turn off and disconnect the fill devise from the

wise, out of the OFF detent positions and adjust the

KY-100.

display and panel lighting for comfortable viewing.

m. Rotate MODE switch out of OFFLINE to exit Key

(3)

Set the PRESET switch to the MAN (manu-

Load.

al) position to apply power to the KY-100 electronics.

Power -on tests will automatically be run when primary

3-2-30. Zeroize Procedures.

power is applied.-

a. Zeroize ALL keys. This procedure is active even if

(4)

Upon successful completion of the power-

primary Power is removed from the KY-100. All key loca-

on tests, the test results should appear in the display. If

tions within the KY-100 will be zeroized. Once zeroized,

PASS is displayed, continue with the turn-on procedures.

only PT voice communications are possible until a new

However, if a FAIL message appears in the display, notify

Traffic Encryption Key (TEK) is loaded.

the next level of maintenance. If PUSH INIT is displayed,

(1)

Pull the MODE switch and rotate it to the Z

perform the cold start procedures as described above in

ALL position. All keys stored in locations 1-6 and U will

paragraph a.

be erased.

3-2-29. Key Loading Procedures.

(2)

If the KY-100 is on when this procedure is

performed, ZEROIZED will be displayed, and a tone will

Key loading may be accomplished using a KYX-15,

be heard.

KYK-13 or a KOI-18. One Key Encryption Key (KEK), up

to six Traffic Encryption Keys (TEKs), and one Emergen-

(3)

If the KY-100 power is on when the MODE

cy Backup (EB) key can be loaded in the KY-100. A Fill

switch is rotated out of Z ALL position, PUSH INIT will be

Cable (ON190191) is required when using one of these

displayed. Follow the COLD START procedures.

devises. Proceed with the following generic Key Loading

b. Zeroize SPECIFIC key locations.

procedures:

(1)

Place the KY-100 MODE switch to the OF-

a. Place the KY-100 MODE switch in OFFLINE posi-

FLINE position.

tion.

(2)

If the KY-100 is not on, turn PRESET switch

b. If the KY-100 is not on, turn PRESET switch to

to MAN position.

MAN position.

(3)

Push the ↑ (up arrow) or → (right arrow)

c. Connect a fill devise to the KY-100 fill connector.

button until KEY OPS is displayed.

d. Push the ↑ (up arrow) or → (right arrow) button

(4)

Push the INIT button. LOAD KEY will be

until KEY OPS is displayed.

displayed.

e. Push the INIT button. LOAD KEY will be dis-

(5)

Push the ↑ (up arrow) or → (right arrow)

played.

button until ZERO is displayed.

3-2-25

TM 1-1520-240-10

(6)

Push the INIT button. ZERO N with a flash-

k. Press the→ (right arrow) button. The Data Rate

ing N will be displayed. The flashing N indicates the cur-

field will be flashing.

rently selected key location to be zeroized.

l. Press the ↑ (up arrow) button until the desired Data

(7)

Press the ↑ (up arrow) or → (right arrow)

Rate (300, 600, 1.2K, or 2.4K) is flashing.

button until the required location (1, 2, 3, 4, 5, 6, U) is

m. After all fields have been set properly: Press the

displayed.

INIT button to save the settings and return to Standard

(8)

Press the INIT button. The entire ZERO N

Operations.

message will now be flashing.

3-2-32. Cipher/Plain Text Level Modification.

(9)

Press the INIT button. The display will go

blank while the key zeroize process is being performed.

The following procedures are used to modify the Receive

Upon completion of a successful key zeroizing, a pass

Cipher Text Level, Receive Plain Text Level, and CT/PT

tone will be heard and display will briefly indicate

or Cipher Text Only menus.

ZEROED N, where N is the key location.

a. Place the KY-100 MODE switch to the CT posi-

tion.

(10) To zeroize additional keys, wait until the dis-

play indicates ZERO N (with N flashing), then repeat

b. Rotate the KY-100 PRESET switch to the CT posi-

steps 7 through 9.

tion.

(11) Rotate MODE switch out of OFFLINE to exit

c. To modify the Receive Ciphertext Volume, go to

Key Load.

step d, to modify the CT/PT or Ciphertext Only setting, go

to step i, and to modify the Receive Plaintext Volume go

3-2-31. Online Mode Selection Menu.

to step n.

This procedure is used to modify the Online MODE con-

d. Push the ↑ (up arrow) or → (right arrow) button

figuration.

until RXCTV N (where N represents the current receive

level) is displayed.

a. Place the KY-100 MODE switch to the CT posi-

tion.

e. Push INIT button. The N in RXCTV N will begin to

flash.

b. Rotate the KY-100 PRESET switch to the MAN

position. If the PRESET switch is in position 1, 2, 3, 4, 5,

f. Push the ↑ (up arrow) or → (right arrow) button until

or 6, the MODE selections cannot be modified. Refer to

the desired receive level is displayed.

the section on changing PRESET settings to modify the

PRESET configuration.

g. Push the INIT button. The N in RXCTV N will stop

flashing.

c. Press the INIT button. The WB (Wide Band) or NB

(Narrow Band) (which ever mode is active) enunciator

h. Push the ↑ (up arrow) or → (right arrow) button

will begin flashing.

until the Operating Mode is displayed. This completes

the Receive Ciphertext Volume adjustment.

NOTE

i. Push the ↑ (up arrow) or → (right arrow) button until

The KY-100 will be operated in Narrow Band

CT or CT ONLY is displayed.

mode only with the ARC-220 Radio Set.

d. Press the ↑ (up arrow) button until the desired

j. Push the INIT button. The CT or CT ONLY will begin

enunciator (WB or NB) is flashing.

to flash.

e. Press the → (right arrow) button. The Mode field

k. Push the ↑ (up arrow) or → (right arrow) button

will be flashing.

until CT (Ciphertext and Plaintext operation) or CT ONLY

(Ciphertext only operation) is displayed.

f. Press the ↑ (up arrow) button until the desired

MODE setting (CT or PT) is flashing.

l. Push INIT button. The CT or CT ONLY will stop

flashing.

g. Press the→ (right arrow) button. The Modem field

will be flashing.

m. Push the ↑ (up arrow) or → (right arrow) button

until the Operating Mode is displayed. This completes

h. Press the ↑ (up arrow) button until the desired

the CT/PT or CT Only setting.

Modem setting (HF, LOS, or bd) is flashing.

n. Push the ↑ (up arrow) or → (right arrow) button

i. Press the→ (right arrow) button. The Key field will

until RXPTV N (where N represents the current receive

be flashing.

level) is displayed.

j. Press the ↑ (up arrow) button until the desired Key

o. Push INIT button. The N in RXPTV will begin to

location (1, 2, 3, 4, 5, or 6) is flashing.

flash.

3-2-26

TM 1-1520-240-10

p. Push the ↑ (up arrow) or → (right arrow) button

The off-line TEST menu consist of automatic (AUTO)

until the desired receive level is displayed.

tests, user-selectable (USER) tests and software version

(VERSION) checking procedures.

q. Push the INIT button. The N in RXPTV N will stop

flashing.

a. Preliminary.

(1)

Set the KY-100 MODE control to the OF-

r. Push the ↑ (up arrow) or → (right arrow) button until

FLINE position.

the Operating Mode is displayed. This completes the

Receive Plaintext Volume adjustment.

(2)

The display will indicate TEST which is the

first OFFLINE menu.

3-2-33. Standard Operation.

(3)

Press the INIT pushbutton to access the

These procedures describe normal transmit/receive op-

TEST submenus.

eration for cipher text and plaintext voice messages.

(4)

Press the ↑ (up arrow) or → (right arrow)

a. Rotate the KY-100 PRESET switch to MAN (for

pushbutton until the desired sub-menu option (AUTO or

manual selection) or the desired preset position.

USER) is displayed.

(5)

Proceed to paragraph b, c or d as applica-

b. For ciphertext operation: Place the MODE switch

ble.

in CT. Ciphertext messages can now be transmitted or

received. If the CT, CT ONLY menu is set for CT, plaintext

b. Automatic (AUTO) Tests.

messages can also be received. When transmitting in

ciphertext, the TX an V enunciators will be lit. When

(1)

With AUTO displayed, press the INIT push-

receiving a ciphertext message, the RX and V enuncia-

button to start the automatic tests.

tors will be lit. When receiving a plaintext message, the

(2)

At the conclusion of the automatic tests, the

PT enunciator will be lit.

test results will be presented in the display.

c. For plaintext operation: Place the MODE switch in

(3)

If the automatic test are successful, PASS

PT. The CT, CT ONLY menu must be set for CT to be able

will be displayed and a pass tome will be heard. Next, the

to transmit or receive plaintext messages. When trans-

display will indicate USER which is the next sub-menu.

mitting in plaintext, the TX enunciator will be lit. When

To perform the USER tests, proceed to paragraph c. To

receiving a plaintext message, the RX and PT enuncia-

exit, rotate the MODE control switch out of the OFFLINE

tors will be lit.

position.

(4)

If a failure is detected during the automatic

3-2-34. Troubleshooting.

tests, a FAIL message will be displayed.

Follow these procedures if the KY-100 displays a FAIL

c. User Tests.

message during equipment configuration or operation.

(1)

With USER displayed, press the INIT push-

a. Rotate the KY-100 PRESET switch to the PWR

button to start the user tests.

OFF position.

(2)

PT LOOP will be momentarily displayed to

b. Place the MODE switch in the OFFLINE position.

indicate that a plaintext loopback test will be performed.

Next, a PTT prompt is displayed.

c. Rotate the RESET switch to MAN.

(3)

Depress and hold the PTT switch and, with

d. If the KY-100 does not display a FAIL message

a TALK prompt displayed, speak into the microphone.

after self test: Return to normal operation.

Looped back plaintext voice will be heard in the handset

receiver.

e. If the KY-100 does display a FAIL message after

self test: Rotate the PRESET to the PWR OFF position.

(4)

Release the PTT switch.

f. Pull the MODE switch and rotate it to the Z ALL

(5)

CT LOOP will be momentarily displayed in-

position.

dicating that the KY-100 is in the cipher text loopback

mode. Next, a PTT operator prompt is displayed.

g. Follow the COLD START Procedures.

(6)

Press and hold PTT switch and, with a TALK

h. If the KY-100 does not display a FAIL message

prompt displayed, speak into the microphone until the

after self test: Return to normal operation.

TALK prompt disappears (approximately 15 seconds).

i. If the KY-100 does display a FAIL message after

(7)

Release the PTT switch. The LISTEN

self test: Notify maintenance.

prompt is displayed. Listen to synthesized speech at the

receiver. Upon completion of the speech loopback, ob-

3-2-35. Off-Line Tests.

serve that PANEL is displayed.

3-2-27

TM 1-1520-240-10

NOTE

(22) Set the PRESET switch to 5. A ’6’is dis-

To exit and skip remaining USER tests, press

played.

the ↑ (up arrow) or → (right arrow) pushbutton

(23) Set the PRESET switch to 6. A pass tone will

switch within 5 seconds.

be heard indicating that the panel test was completed

(8)

Within 5 seconds after completion of the CT

successfully.

loopback test, observe that all liquid crystal display (LCD)

segments are on. At completion of the display test a

(24) Upon completion of the USER tests, the

momentary INIT operator prompt is displayed indicating

menu will sequence to VERSION. Exit the user test mode

the start of front panel switch test.

at this time by rotating the MODE control switch out of the

OFFLINE position.

NOTE

Failure to perform any of the panel pushbut-

ton and switch prompts within 30 seconds will

result in a fail tone and the display will indicate

FAIL FP (Front Panel.

(9)

Press the INIT pushbutton switch. An →

(right arrow) is displayed.

(10) Press the

→ (right arrow) pushbutton

switch. An ↑ (up arrow) is displayed.

(11) Press the ↑ (up arrow pushbutton switch. PT

is displayed.

(12) Set the MODE control switch to PT. CT is

displayed.

Figure 3-2-9. Remote Control Unit TSEC/KY-100

(13) Set the MODE control switch to CT. RK is

(Z-AVH)

displayed.

(14) Set the MODE switch to RK. OFL is dis-

played.

(15) Set the MODE control switch to OFFLINE.

Eb is displayed.

(16) Set the MODE control switch to EB. PRE-

SET will be momentarily displayed, followed by MAN.

(17) Set the PRESET switch to MAN. A ’1’ is

displayed.

(18) Set the PRESET switch to 1. A ’2’ is dis-

played.

(19) Set the PRESET switch to 2. A ’3’ is dis-

played.

(20) Set the PRESET switch to 3. A ’4’ is dis-

played.

(21) Set the PRESET switch to 4. A ’5’ is dis-

played.

Figure 3-2-10. LCD Display TSEC/KY-100 (Z-AVH)

3-2-28

TM 1-1520-240-10

SECTION III. NAVIGATION EQUIPMENT

3-3-1. VHF NAVIGATION AND INSTRUMENT LAND-

3-3-2. OPERATION CHECK/SELF - TEST.

ING SYSTEM (AN/ARN-123).

The VHF navigation and instrument landing system (AN/

NOTE

ARN-123) is an integrated navigation receiver consisting of

a 160 channel VOR receiver, a 40-channel localizer receiv-

This test requires an external VOR RF signal

er, a 40 channel glideslope receiver, and a market beacon

generated by a ground station, or ramp test

receiver. Each receiver operates independently. The sys-

set.

tem consists of a control panel on the console, a receiver

on the avionics shelf, and three antennas on the fuselage.

a. Set the course indicator OBS control for a 315

The set includes VOR and marker beacon self-test capabil-

degrees indication under the course index.

ity.

a. VOR/Localizer Receiver. The VOR/localizer re-

ceiver processes signals in the frequency range 108.00

b. Move the control unit VOR/MB switch to the test

through 117.95 MHz. The VOR/localizer information is pre-

position (down).

sented on the course deviation bar of the HSI on the pilot’s

and copilot’s instrument panels. VOR bearing information is

displayed on the No. 2 pointer of the indicator. If the received

c. The CDI deviation needle should indicate center

signal is weak or the set malfunctions, a red NAV flag will

"2 dots.

appear on the indicator. The VOR/localizer antenna is on the

bottom of the helicopter at sta. 79.

d. The VOR/LOC flag should be buried.

b. Glideslope Receiver. The glideslope receiver sec-

tion of the AN/ARN-123 processes signals in the frequency

range of 329.15 through 335.00 MHz. Glideslope informa-

e. The RMI should point to the 315 degrees ra-

tion is displayed on the HSI. The set will also cause a red

dial("5 degrees).

GS warning flag to appear on the indicator when the re-

ceived signal is unreliable or the glideslope receiver mal-

functions. The glideslope antenna is on the forward pylon

The marker beacon lamp(s) should illuminate.

above the windshield.

c. Marker Beacon Receiver. The marker beacon re-

ceiver is a fixed -frequency receiver (75 MHz) which re-

3-3-3. Controls and Function, VHF Navigation and

ceives signals from a ground marker beacon transmitter

Instrument Landing System Set. (fig. 3-3-1)

to determine helicopter position. The audio output of the

marker beacon receiver is applied through the inter-

phone system to the headsets as a direct input (no inter-

phone control box switch setting necessary). Three

CONTROLS/

FUNCTION

marker beacon lights are on each HSI MODE SELECT

INDICATOR

panel. The lights are labeled MKR BCN and indicate

marker beacon passage. Also specific tones will be

NAV VOL

Provides power to set

heard over the interphone while flying over each beacon.

when turned from OFF.

Table 3-3-1 presents the indication as each beacon is

Turning knob clock-wise

passed. The lights are tested by momentarily pressing

increases volume.

any one of three lights. The marker beacon antenna is

under the fuselage is under the fuselage forward of the

VOR/MB TEST

Switch spring-loaded

forward cargo hook. Power to operate the set is from the

from TEST position. At

DC essential bus through the NAV VOR circuit breaker

TEST, the MKR BCN

on the No.1 PDP. Power is supplied by the 26-volt AC

lights illuminate.

instrument bus through the NAV VOR circuit breaker on

Megahertz Select Knob

Selects last two digits of

the No. 1 PDP.

frequency in 50 -kilohertz

Table 3-3-1. Marker Beacon Indicator

increments.

BEACON

LIGHT COLOR TONE (HERTZ)

MB VOL

Adjusts audio output lev-

Outer (O)

Blue/Green

400

el of marker beacon re-

ceiver. Provides power to

Middle (M)

Blue/Green

1300

the marker beacon when

Inner (I)

Blue/Green

3000

turned from OFF.

3-3-1

TM 1-1520-240-10

(2)

MB SENS - HI for enroute. Lo for ap-

CONTROLS/

FUNCTION

INDICATOR

proach.

MB SENS

Labeled HI and LO. LO

sensitivity is used for

(3)

MKR BKN lamps on HSI MODE SELECT

positive identification of

panels - Check lit at corresponding station passage.

marker beacon passage.

HI is used for station

passage identification at

d. Stopping - NAV VOL and MB VOL switches -

the outer marker or en-

OFF

route.

Marker Beacon Indicator

Three lights marked 0,M,

Lights

and I on both HSI MODE

3-3-5. Direction Finder Set (AN/ARN-89).

SELECT panels. Lights

illuminate when passing

over beacons.

Direction finder set (AN/ARN-89) is an airborne automat-

ic direction finder (ADF) operating within the frequency

3-3-4. Normal Operation - VHF Navigation and In-

range of 100 to 3,000 kHz. The equipment provides visu-

strument Landing System. The following paragraphs

provide navigation radio set operating procedures.

al and aural facilities for ADF homing and position fixing.

It is used as a navigational radio aid to continuously and

a. Starting.

visually indicate the magnetic bearing of a radio station

(1)

Interphone AUX switch - ON

while providing aural reception. The bearing of a radio

station is displayed on the No. 2 bearing pointer on the

HSI. Power to operate the direction-finder set is supplied

by the No. 1 DC bus and the AC instrument bus through

the NAV ADF circuit breakers on the No. 1 PDP.

3-3-6. Controls and Function, Direction Finder Set

(AN/ARN-89). (fig. 3-3-2)

Figure 3-3-1. VHF Navigation and Instrument

CONTROLS/

FUNCTION

Landing System Control (AN/ARN-123)

INDICATOR

Mode Switch OFF

OFF position deener-

gizes the direction finder

(2)

NAV VOL switch - ON.

set.

b. VOR/Localizer/ILS Operation.

COMP

COMP position selects

(1)

Megahertz and kilohertz selector - Set fre-

automatic direction find-

quency of facility.

ing.

(2)

VOR SEL switch on HSI MODE SELECT

ANT

ANT position permits re-

panel - Press. Check SEL light lit.

ception for radio naviga-

(3)

VOR ADF switch on HSI MODE SELECT

tion or as a broadcast

panel - Press, if VOR segment is not lit

receiver.

(4)

Volume control - Adjust. Identify facility

LOOP

LOOP position, used in

conjunction with LOOP

(5)

HSIs - Check for correct indications.

switch, permits aural null

c. Marker Beacon operation.

homing and manual di-

rection finding.

(1)

MB VOL switch - ON.

3-3-2

TM 1-1520-240-10

CONTROLS/

FUNCTION

KILOHERTZ Indicator

Displays operating fre-

INDICATOR

quency to which receiv-

er is tuned.

AUDIO Control

Adjusts audio level in

COMP position. Used as

TUNE Meter

Provides indication of

RF gain control in LOOP

relative signal strength

or ANT position.

while tuning receiver to

specific radio signal.

LOOP Switch

When function switch is

set to LOOP, LOOP

CW-VOICE-TEST Switch Three position toggle

switch enables manual

switch. Spring-loaded

rotation of ADF loop an-

from TEST.

tenna and bearing indi-

Enables the beat fre-

cator pointer left or right

quency oscillator (BFO)

for manual direction

to permit tuning to con-

finding, or when homing

tinuous wave stations.

to a radio station. Re-

turning LOOP switch to

VOICE

Enables the set to oper-

center position stops

ate as an AM receiver.

rotation of bearing indi-

TEST

Rotates the bearing indi-

cator pointer at any de-

cator approximately

sired position.

180_ to check operation

of the set. The TEST

switch functions when

the function switch is at

COMP only.

3-3-7. Normal Operation

- Direction Finder

Set. The following paragraphs discuss ADF set opera-

tion.

a. Starting.

(1)

Interphone control panel - Receivers NAV

switch - ON.

(2)

Mode switch - ON.

(3)

CW-VOICE-TEST - CW or VOICE.

(4)

Tune controls - Set frequency. Tune for

maximum signal strength on the tuning meter.

(5)

AUDIO control - Adjust.

b. ADF Operation.

(1)

VOR ADF switch on HSI MODE SELECT

panel - Press, if ADF segment is not lit.

Figure 3-3-2. Direction Finder Control

(2)

Check for the correct bearing indication, on

CONTROLS/

FUNCTION

HSI No. 2 bearing pointer.

INDICATOR

c. Radio Receiver Operation.

Coarse Tune Control

Tunes receiver in 100

(1)

Function switch - ANT

kHz steps as indicated

(2)

Tune control - Set frequency; then tune for

by first two digits of KI-

maximum signal strength on the tuning meter.

LOHERTZ indicator.

d. Aural Null.

Fine Tune Control

Provides selection of 10

kHz digits (continuous

(1)

CW-VOICE-TEST switch - CW.

tuning) as indicated by

(2)

Function switch - LOOP.

last two digits of KI-

(3)

Loop switch - Rotate for audio and tune

LOHERTZ indicator.

indicator null. Release switch. Observe bearing to station

CONTROLS/

FUNCTION

on indicators. Two null positions, 180_ apart, may be

INDICATOR

obtained.

3-3-3

TM 1-1520-240-10

3-3-8. Gyromagnetic Compass Set (AN/ASN-43).

CONTROLS/

FUNCTION

INDICATOR

The gyromagnetic compass set (fig. 3-3-3) is a direction

HDG Flag

A red flag on both HSIs

sensing system which provides a visual indication of the

indicates failure of the

heading of the helicopter with respect to the earth’s mag-

gyromagnetic compass

netic field or referenced to a free directional gyro. Head-

system when displayed.

ing information is displayed on both HSIs. The display is

used in a navigation to maintain flight path direction.

Also, any heading selected with the heading bug on ei-

3-3-10. Operating Procedures

- Gyromagnetic

ther HSI can be automatically maintained by the AFCS.

Compass Set. (fig. 3-3-3)

Power to operate the system is supplied by the No. 1 AC

bus and the AC instrument bus through the NAV CMPS

circuit breakers on the No. 1 PDP.

a. Slaved Gyro Operation. With compass slaving

switch at SLAVED, the system operates in the slaved

mode and the directional gyro precesses to align the

3-3-9. Controls and Function, Gyromagnetic Com-

compass cards on the HSIs with the magnetic heading

pass Set (AN/ASN-43). (fig 3-3-3 and 3-3-4)

of the helicopter. During the first 2 minutes after power is

applied, the system operates in a fast slave mode while

the gyro attains its speed. After this initial alignment peri-

CONTROLS/

FUNCTION

od is complete, the gyromagnetic compass will return to

INDICATOR

the normal slaved mode. During this mode of operation,

the compass cards will remain aligned with the magnetic

LATITUDE Switch

Two-position switch on

the directional gyro lo-

heading of the helicopter. The annunciator pointer will

cated on the avionics

occasionally point to a dot (Ĥ) or a plus sign (+) indicat-

shelf. This switch is

ing that corrections are automatically being made.

used to correct for gyro

precession for the hemi-

b. Free Directional Gyro Operation. If the compass

sphere of operation: N

slaving switch is at FREE, the system operates in the free

for northern hemisphere

directional mode. In this mode, the compass cards can

and S for southern

be set to any heading by pressing the PUSH TO SET

hemisphere.

knob and turning it until the cards reach the selected

LATITUDE Control Switch

Rotary control on direc-

setting. Normally, the free directional gyro mode is

tional gyro labeled 0 to

employed only in polar regions of the earth where mag-

90. It is used to set the

netic references are unreliable. However, it can be useful

local latitude into the di-

if the slaving system malfunctions. For proper operation,

rectional gyro for free

the latitude controls on the directional gyro (fig. 3-3-4)

gyro operation.

must be set to the local latitude.

SLAVED-FREE Switch

On compass control

panel. When switch is at

SLAVED, the compass

cards on both HSIs are

slaved to the output of

the remote compass

and-stabilized by the di-

rectional gyro. At FREE,

the cards are referenced

to the directional gyro

only and act as turn indi-

cators. FREE is used

primarily in polar regions

where magnetic indica-

tions may be unreliable.

PUSH TO SET synchro-

Rotated in (Ĥ) or (+) di-

nizing knob

rection as indicated by

annunciator pointer to

align compass cards

Figure 3-3-3. Gyromagnetic Compass Set Control

with gyro-compass.

Panel

3-3-4

TM 1-1520-240-10

NOTE

3-3-11. Doppler Navigation Set (AN/ASN-128).

If synchronizing becomes necessary in flight

with the AFCS on, position the SWIVEL

NOTE

switch to UNLOCK. After synchronization is

complete, position the SWIVEL switch to

When the Airborne Navigation Set AN/

LOCK. This prevents unwanted yaw axis in-

ASN-149 (Global Positioning System GPS) is

puts.

installed, the Doppler Navigation Set AN/

c. Manual Synchronization. If power has been ap-

ASN-128 is controlled by the GPS CDU. For

plied to the system with the compass slaving switch at

a description of the Airborne navigation Set

FREE or if the system has been operated in the free

and Doppler Navigation Set.

directional gyro mode for a period of time, the compass

a. The doppler navigation set (fig. 3-3-5) is a self-

cards will not be aligned with the magnetic heading of the

contained navigation system that does not require any

helicopter. The system can be reset to the correct mag-

ground-based aids. The system provides worldwide nav-

netic heading by pushing and turning the PUSH TO SET

igation with position readout available in both universal

knob in the direction of the symbol indicated by the an-

transverse mercator (grid) (UTM) and latitude and longi-

nunciator pointer until the pointer is centered. If the slav-

tude (lat/long). Navigation and steering is done using

ing switch is then set to SLAVED, the compass cards will

lat/long coordinates, and bilateral UTM-lat/long conver-

maintain correct magnetic heading.

sion routine is provided for UTM operation.

b. The system in conjunction with heading data from

the gyro compass, and pitch and roll data from the copi-

lot’s attitude gyro, provides velocity, position, and steer-

ing information from ground level to 10,000 feet.

c. The computer-display unit (CDU) is on the canted

console, between the pilot and copilot positions. Course

deviation, bearing, distance to destination, and NAV GO/

NOGO are also presented to the HSI. Built in test equip-

ment (BITE) continuously monitors system operation. If

a failure occurs, a malfunction indicator lamp will light

and coded data, indicating the failed component, will be

displayed on the CDU when the MODE switch is set to

TEST. Power to operate the set is supplied by the No. 2

DC bus through the NAV DOPPLER circuit breaker on

the No. 2 PDP, and the No. 1 AC instrument bus through

the NAV DOPPLER circuit breaker on the No. 1 PDP.

Figure 3-3-4. Directional Gyro (CN-998/ASN-43)

3-3-5

TM 1-1520-240-10

3-3-12. Controls and Function -- Doppler Naviga-

CONTROLS/

FUNCTION

tion Set. (fig. 3-3-5 and table 3-3-2)

INDICATOR

GS/TK

CONTROLS/

FUNCTION

INDICATOR

(Left Display)

Ground speed (GS) in

MODE Selector

Selects doppler naviga-

km/hr.

tion mode of operation as

(Right Display)

Track angle in degrees

follows:

relative to true north.

OFF

Turns set off. Pull knob

PP with mode switch

out to move from, or to

set to UTM

this position.

(Center Display)

Present position UTN

LAMP TEST

Checks operation of all

zone.

lamps and lamp seg-

ments.

(Left Display)

Present position UTM

square designator and

TEST

Initiates (BIT) for set.

easting in km to nearest

System reverts to backup

10 meters.

navigation operation dur-

ing mode.

(Right Display)

Present position UTM

UTM

Selects universal trans-

northing in km nearest 10

verse mercator coordi-

meters.

nate system for display

PP with MODE switch

and insertion of informa-

set to LAT/LONG

tion.

LAT/LONG

Select latitude/longitude

(Left Display)

Present latitude position

coordinate system for

in degrees, minutes, and

display and insertion of

tenths of minutes.

information.

(Right Display)

Present longitude posi-

BACKUP

Places set in remem-

tion in degrees, minutes,

bered velocity mode of

and tenths of minutes.

operation.

DIST/BRG/TIME

DISPLAY Selector

Selects navigation data

for display as follows:

(Center Display)

Time to the destination

set on FLY-TO DEST

WIND SP/DIR

Used only with BACKUP

thumbwheel in minutes

mode.

and tenths of minutes.

(Left Display)

Windspeed kilometer(s)

(Left Display)

Distance to the destina-

per hour.

tion set on FLY-TO DEST

(Right Display)

Direction (degrees) rela-

thumbwheel in km and

tive to true north.

tenths of a km.

XTK/TKE

(Right Display)

Bearing to the destination

set on FLY- TO DEST

(Left Display)

Distance crosstrack error

thumbwheel is degrees.

(XTK) in km and tenths of

Bearing is also indicated

a km left or right of heli-

by the No. 1 bearing

copter. Track error will

pointer on both HSIs.

also be displayed by the

course deviation indicator

DEST/TGT

(CDI) on the HSI when

DOP.

(Center Display)

UTM zone of destination

SEL on the HSI MODE

set on DEST DISP

SELECT panel is

thumbwheel.

pressed.

(Left Display)

UTM square designator

(Right Display)

Track angle error (TKE)

and easting or latitude (N

in degrees and right or

84_ to S 80_ approx) of

left of present helicopter

destination set on DEST

heading.

DISP thumbwheel.

3-3-7

TM 1-1520-240-10

CONTROLS/

FUNCTION

CONTROLS/

FUNCTION

INDICATOR

SPH/VAR

Keyboard

Used to enter data into

system. Keys set up data

(Left Display)

Spheroid code of desig-

on display. All resulting

nation set on DEST DISP

actions are initiated upon

thumbwheel.

release of the key.

(Right Display)

Magnetic variation (in de-

FLY-TO-DEST Thumb-

Selects destination to

grees and tenths of de-

wheel Switch

which steering informa-

grees) of destination set

tion is desired. Destina-

on DEST DISP thumb-

tions are 0 through 9, P

wheel.

(present position) and H

(home).

MAL Indicator Lamp

Lights when set malfunc-

tions. In case of an inter-

ENT Key

Enters data set up on

mittent malfunction, sys-

keyboard into memory

tem may operate correct-

when pressed.

ly, but must be cycled to

CLR Key

Clears last entered char-

OFF and then to on to

acter when pressed

put MAL light off.

once. Clears entire dis-

MEM Indicator Lamp

Lights when radar portion

play panel under key-

of set is not tracking. May

board control when

occur over smooth water.

pressed twice.

DIM Control

Controls light intensity of

3-3-13. Display and Keyboard Operation.

display characters.

In LAT/LONG coordinates, the two fields of control are

Left, Right, and Center

Alphanumeric and nu-

Display Lamp

meric characters that dis-

the left and right displays. In UTM coordinates, the first

play data as determined

field of control is the center display and the second field

by setting of DISPLAY

is the combination of the left and right displays. When

switch, mode switch, and

pressing the KYBD pushbutton, one or other of the fields

keyboard.

described above is under control. If it is not desired to

change the information in the field under control, the pilot

Target Storage Indicator

Displays destination

can advance to the next field of the display panel by

number (memory loca-

tion) in which present

pressing the KYBD pushbutton again.

position will be stored

when TGT STR pushbut-

3-3-14. Data Entry

ton is pressed.

To enter a number, press the corresponding key. To enter

TGT STR Pushbutton

Stores present position

a letter, first press the key corresponding to the desired

data when pressed.

letter. Then press a key in the LEFT, MID, or RIGHT

column corresponding to the position of the letter on the

KYBD Pushbutton

Used in conjunction with

pushbutton.

keyboard to allow data

entry. KYBD pushbutton

Example: To enter an L, first press L, then either 3, 6, or

is always lighted when

9 in the RIGHT column. The computer program is de-

system is on.

signed to reject unacceptable data (for example, a UTM

DEST DISP Thumbwheel

Destination display

area of WI does not exists, and will be rejected). If the

Switch

thumbwheel switch is

operator attempts to insert unacceptable data, the dis-

used along with DEST/

play will be blank after ENT is pressed.

TGT and SPH/VAR posi-

tions of DISPLAY switch

3-3-15. Starting Procedure.

to select destinations

whose coordinates or

a. MODE selector - LAMP TEST. All lights and lamp

magnetic variation to be

segments should be lit.

displayed or entered.

(1)

Left, right, center and target storage indica-

Destinations are 0

through 9, P (present

tor - Lit (fig. 3-3-5). All other lights should be on.

position) and H (home).

(2)

Turn DIM control fully clockwise, then fully

counterclockwise, and return to full clockwise; all seg-

ments of the display should alternately glow brightly, go

off, and then glow brightly.

3-3-8

TM 1-1520-240-10

Table 3-3-2. Computer-Display Unit Data Displays

CENTER DISPLAY

LEFT DISPLAY

RIGHT DISPLAY

SWITCH POSI-

DATA

RANGE

DATA

RANGE

DATA

RANGE

TION

WIND SP/DIR

Windspeed

999 km/h

Wind Direc-

359_

tion

XTK/TKE

Crosstrack Dis-

L/R 999.9

Track Angle

R/L 180_

tance Error

Error

GS/TK

Groundspeeed

999 km/h

Track

359_

UTM

UTM Zone Note 2

Area/Easting

WV9999

Northing

9999

LAT/LONG

Latitude

N 84_00.0”

Longitude

E/W

S 80_00.0”

180_00.0”

DIST/BRG/TIME

Time

99.9 Min.

Distance to Go

999.9 km

Bearing

359_

DEST/TGT UTM

UTM Zone Note 2

Area/Easting

WV9999

Northing

9999

Note 3

LAT/LONG

Latitude

N 84_00.0”

Longitude

E/W

S 80_00.0”

180_00.0”

SPH/VAR

Spheroid

Note 1

Variation

E/W 180_

Note 4

NOTES:

1. See table 3-3-3 for spheroid data codes and covered areas.

2. Numeric: 01-60.

Alpha: C-X, except I and O.

3. Typical 100 km Designator:

Column Designator: A-Z, except I and O.

Row Designator: A-V, except I and O.

4. Variation displayed is for destination indicated by DESP DISP thumbwheel.

b. MODE selector - TEST. After about 15 seconds,

DISPLAY

left display should display GO. Ignore the random display

of alpha and numeric characters which occurs during the

LEFT

RIGHT

REMARKS

first 15 seconds. Also ignore test velocity and angle data

displayed after the display has frozen. After about 15

Display

System is operating satisfac-

seconds, one of the following five displays will be ob-

blanks

torily.

served in the first two character positions in the left dis-

play.

If right display is P, then pitch

or roll data is missing or in er-

NOTE

ror. In this case, pitch and roll

If the MAL lamp lights during any mode of

in the computer are both set

operation except LAMP TEST, the computer-

to zero and navigation is de-

display unit MODE switch should be set to

graded. Problem may be in

OFF, and then to TEST, to verify the failure. If

the vertical gyroscope or heli-

the MAL lamp remains on at TEST, notify

copter wing.

maintenance.

C, R, S,

A failure has occurred and the

If the TEST mode display is MN or NG, the MODE switch

or H fol-

system has automatically

should be recycled through OFF to verify that the failure

lowed

switched to a BACKUP mode

is not a momentary one. If the TEST mode display is MN,

by a nu-

of operation using last re-

the data entry may be made in the UTM or LAT/LONG

meric

membered velocities for na-

mode, but any navigation must be carried on with the

code

vigation. The operator can, as

system in the BACKUP mode.

3-3-9

TM 1-1520-240-10

NOTE

DISPLAY

It is not necessary to enter destinations un-

LEFT

RIGHT

REMARKS

less steering information is required, unless it

an option, enter his best esti-

is desired to update present position by over-

mate of ground speed and

flying a destination, or unless a present posi-

track angle.

tion MAG VAR computation is desired. If a

present position MAG VAR running update is

C, R, S,

A failure occurred and the

desired, destination MAG VAR must be enter-

or H fol-

BACKUP mode used for

ed. The operator may enter one or more des-

lowed

manual navigation (MN) is the

tination variations to effect the variation up-

by a nu-

only means of valid naviga-

date; it is not necessary for all destinations to

meric

tion. The operator may use

have associated MAG VAR entered.

code

the computer as a dead reck-

oning devise by entering

e. Variation of destinations.

ground speed and track data.

3-3-17. Entering Spheroid and/or Variation.

The operator should update

present position as soon as

a. MODE selector - UTM, LAT/LONG or BACKUP.

possible, because it is pos-

b. DISPLAY selector - SPH-VAR.

sible significant navigation er-

rors may have accumulated.

c. DEST DISP thumbwheel - P, numeral, or H as

C, R, S,

A failure has occurred in the

desired.

or H fol-

system and the operator

d. KYBD pushbutton - Press. Observe display

lowed

should not use the system.

freezes and TGT STR indicator blanks. Press KYBD

by a nu-

pushbutton again and observe left display blanks. If no

meric

spheroid data is to be entered, KYBD pushbutton -

code

Press again, go to step g.

The 9V battery has failed. The

e. Spheroid data (table 3-3-3) - Entry. (Example:

system will still operate but all

IN0). Press keys 3, 3, 5, 5, and 0. Left display should

stored data will be lost when

indicate IN0.

set is turned off. Data must be

re-entered.

f. ENT key - Press if no variation data are to be

entered.

Random

A failure occurred and the op-

display

erator should not use the sys-

g. KYBD pushbutton - Press, if variation data is to

tem.

be entered, and note right display blanks.

h. Variation data - Enter. (Example: E001.2, press

keyboard keys 2, 2, 0, 0, 1 and 2. Press ENT key, the

3-3-16. Entering Data.

entire display will blank and TGT STR number will re-

appear, display should indicate IN0 E001.2.)

This initial data is inserted before navigating with the

NOTE

doppler.

If operation is to occur in a region with relative-

a. Spheroid of operation, when using UTM coordi-

ly constant variation, the operator enters vari-

nates.

ation only for present position, and the com-

puter will use this value throughout the flight.

b. UTM or LAT/LONG coordinates of present posi-

tion.

Table 3-3-3 Spheroid Data Codes

c. Magnetic Variation (MAG VAR) of present posi-

SPHEROID

CODE

AREA COV-

tion.

ERED

CLARKE 1866

CL6

United States

d. Coordinates of desired destination - 0 through 5

north through

and H: (6 through 9 are normally used for target store

North Pole

locations; but may also be used for destinations.) It is not

CLARKE 1880

CLφ

Africa west

necessary to enter all destinations in the same coordi-

through Algeria

nate system.

3-3-10

TM 1-1520-240-10

Table 3-3-3. Spheroid Data Codes (Continued)

is deleted. The order of entry for present position is irrele-

vant.

SPHEROID

CODE AREA COVERED

a. MODE selector - LAT/LONG.

INTERNATIONAL

INφ

All of Europe, Saudi

b. DISPLAY selector - DEST-TGT.

Arabia, Greenland,

c. DEST DISP thumbwheel - P, numeral, or H as

South America, Indian

desired.

Ocean, Pacific

Ocean, and Atlantic

d. Present position or destination - Enter. (Exam-

Ocean.

ple: Entry of N41_ 10.1 minutes and E035_ 50.2 min-

BESSEL

BEφ

Indonesia, Manchu-

utes.)

rian, to Eastern Rus-

(1)

KYBD pushbutton - Press. Observe that

sia.

display freezes and TGT STR indicator blanks.

EVEREST

EVφ

Mt. Everest, India,

(2)

KYBD pushbutton - Press. Observe that

and Pakistan

left display blanks.

AUSTRALIAN

AUφ

Australia

(3)

Key 5, 5, 4.1, 1, 0, and 1 - Press.

NATIONAL

(4)

KYBD pushbutton - Press. Observe right

display blank.

3-3-18. Entering Present Position or Destination in

UTM.

(5)

Key 2, 2, 0, 3, 5, 5, 0, and 2- Press.

The variation of a destination must be entered after the

(6)

ENT key - Press. Left, right, and center

associated destination coordinates are entered, since

displays will momentarily blank and TGT STR number

each time a destination is entered its associated variation

will reappear. Displays should indicate N41_ 10.1 E035_

is deleted. The order of entry for present position is irrele-

50.2.

vant.

3-3-20. Entering Ground Speed and Track.

a. MODE SELECTOR - UTM.

a. MODE selector - BACK UP.

b. DISPLAY selector - DEST-TGT.

b. DISPLAY selector - GS-TK.

c. DEST DISP thumbwheel - P, numeral, or H as

c. Ground speed and track - Enter. (Example; Enter

desired.

131 km/h and 024_. Press KYBD pushbutton, observe

d. Present position and destination - Enter. (Exam-

that left display freezes and TGT STR indicator blanks.

ple: Entry of zone 31T, area CF, easting 0958 and north-

Press KYBD pushbutton and observe that left display

ing 3849).

blanks.

d. Press keys 1, 3, and 1. Left display indicates 131.

(1)

KYBD pushbutton - Press. Observe that

Press KYBD pushbutton, control shifts to right display,

display freeze and TGT STR indicator blanks.

and right display blanks. Press keys 0, 2 and 4.

(2)

KYBD pushbutton - Press. Observe that

e. ENT key - Press. The entire display will blank,

center display blanks.

and TGT STR number will reappear. Display should indi-

(3)

Key 3, 1, 7, and 8 - Press.

cate 131 024_.

(4)

KYBD pushbutton - Press. Observe left

3-3-21. System Initialization.

and right displays blank.

a. DEST DISP thumbwheel - P.

(5)

Key 1, 3, 2, 3, 0, 9, 5, 8, 3, 8, 4, 9- Press.

b. Present position spheroid and/or variation (para.

(6)

ENT key - Press. Left, right and center dis-

3-39) - Enter.

plays will momentarily blank and then display CF 0958,

NOTE

3849, 31T, respectively, TGT STR number will appear.

Do not press ENT key after entering initial

3-3-19. Entering Present Position or Destination in

position fix.

LAT/LONG.

c. Initial fix position (para. 3-3-18 or 3-3-19) - En-

ter.

The variation of a destination must be entered after the

associated destination coordinates are entered, since

d. When the helicopter is sitting over or overflies the

each time a destination is entered its associated variation

initial fix position - ENT.

3-3-11

TM 1-1520-240-10

e. FLY-TO DEST thumbwheel - Set to desired des-

(2)

DEST DISP thumbwheel - P. Present posi-

tination. The computer calculates a course between the

tion coordinates should be displayed.

destination and the helicopter position at the time the

(3)

KYBD pushbutton - Press, observe that

destination was selected.

display freezes.

3-3-22. Flight Procedures.

NOTE

If present position update is not desired, as

3-3-23. Update of Present Position from Stored Des-

indicated by a small difference between the

tination.

displayed coordinates and the landmark

coordinates, set the DISPLAY selector to

a. FLY-TO DEST thumbwheel - Set to destination to

some other position; this aborts the update.

be overflown.

(4)

Landmark coordinates - Manually enter via

b. DISPLAY selector - DIST/BRG-TIME.

keyboard.

(5)

ENT key - Press when overflying land-

c. KYBD pushbutton - Press and release when heli-

mark.

copter is over the destination. Display freezes upon re-

lease of the pushbutton.

3-3-25. FLY-TO-DEST Operation.

NOTE

a. When the FLY-TO-DEST thumbwheel is selected

If a present position update is not desired, as

to a new position, the helicopter’s present position at the

indicated by an approximately small value of

time is stored in the computer. A course is then computed

distance to go on overflying the destination,

from the helicopter’s present position, as stored, to the

set the DISPLAY selector to some other posi-

destination selected. If the helicopter deviates from this

tion; this aborts the update mode.

course, crosstrack error (XTK) is computed.

d. ENT key - Press if update is required.

b. Range and bearing to destination, current track

made good, and track angel error (TKE) correction are

3-3-24. Update of Present Position from Land-

computed from the helicopter’s present position to se-

mark.

lected destination.

There are two methods for updating from landmark.

Method 1 is used if the landmark comes up unexpectedly

3-3-26. Left-Right Steering Signals.

and the operator needs time to determine the coordina-

Flying the shortest distance to the destination from pres-

tes. Method 2 is used when the landmark update is antici-

ent position:

pated.

a. FLY-TO-DEST thumbwheel - Select desired des-

a. Method 1.

tination.

(1)

DISPLAY selector - PP.

NOTE

(2)

KYBD pushbutton - Press as landmark is

If the desired destination is already selected

overflown. Present position display will freeze upon re-

but an updated course is needed, then the

lease of pushbutton.

FLY-TO-DEST thumbwheel must be cycled to

another destination and back so the computer

(3)

Compare landmark coordinates with those

will recalculate the new course.

on display.

b. DISPLAY selector - XTK/TKE.

NOTE

c. Fly to keep the left display at L or R 000.0 and the

right display to L or R 000.

If present position update is not desired, as

indicated by a small difference between the

3-3-27. Target Store (TGT STR) Operation.

display coordinates and the landmark coordi-

nates, set the DISPLAY selector to some oth-

Two methods may be used for target store operation.

er position; this aborts the update.

Method 1 is normally used when time is not available for

(4)

Landmark coordinates - Enter if difference

preplaning a target store operation. Method 2 is used

warrants an update.

when time is available and it is desired to store a target

in a specific DEST DISP position.

(5)

ENT key - Press if update is required.

a. Method 1.

b. Method 2.

(1)

TGT STR pushbutton - Press when flying

(1)

DISPLAY selector - DEST/TGT.

over target.

3-3-12

TM 1-1520-240-10

(2)

Present position at the time the pushbutton

3-3-30. Dead Reckoning Navigation.

is released is automatically stored and the destination

As a BACKUP mode, dead reckoning navigation can be

location is that which was displayed in the target store

done using ground speed and track angle estimates pro-

indicator (position 6, 7, 8 or 9) immediately before press-

vided by the operator.

ing the TGT STR pushbutton.

a. MODE selector - BACKUP.

b. Method 2.

b. DISPLAY selector - GS/TK.

(1)

MODE selector - UTM or LAT/LONG, de-

c. Best estimate of ground speed and track angle -

pending on coordinate format desired.

Enter via keyboard.

(2)

DISPLAY selector - DEST/TGT.

d. Set MODE selector to any position to abort this

mode.

(3)

DEST DISP thumbwheel -P.

3-3-31. Operation During and After Power Interrup-

(4)

KYBD pushbutton - Press when over flying

tion.

potential target. Display should freeze.

During a DC power interruption inflight, or when all heli-

NOTE

copter power is removed, the random access memory

Do not press ENT key while DEST DISP

(RAM) (stored destination and present position) data is

thumbwheel is at P.

retained by power from an 8.4 volt DC dry cell battery.

This makes it unnecessary to reenter any navigational

(5)

If it is desired to store target, turn DEST

data when power returns or before each flight. If the

DISP thumbwheel to destination location desired and

battery does not retain the stored destination data during

press ENT key.

power interruption the display will indicate an EN when

(6)

If it is not desired to store target, place DIS-

power returns. This indicates to the pilot that previously

PLAY selector momentarily to another position.

stored data has been lost, and that present position,

spheroid/variation, and destinations must be entered.

The computer, upon return of power, resets present posi-

3-3-28. Transferring Stored Target Coordinates from

tion variation to E000.0, destination and associated vari-

One Location to Another.

ations to a non-entered state, sets wind to zero and

The following procedure allows the operator to transfer

spheroid to CL6. The following data must be entered

stored target coordinates from one thumbwheel location

following battery failure:

to another. For example, it is assumed that the pilot wants

a. Spheroid.

to put the coordinates of stored target 7 into location of

destination 2.

b. Present position variation.

NOTE

c. Present position.

Throughout this procedure, range, time-to-

d. Each destination and its associated variation.

go, bearing and left/right steering data are

3-3-32. Stopping Procedure.

computed and displayed for the destination

selected via the FLY-TO-DEST thumbwheel.

MODE selector - OFF.

a. DISPLAY selector - DEST/TGT.

3-3-33. Horizontal Situation Indicator (HSI).

b. DEST DISP thumbwheel - 7.

Two horizontal situation indicators (HSI) (fig. 3-3-6), one

on each pilot’s instrument panel, are installed. Each indi-

c. KYBD pushbutton - Press.

cator can display helicopter heading, FM homing, and

d. DEST DISP thumbwheel - 2.

position relative to a selected course or bearing. Also,

during an ILS approach, the indicator displays helicopter

e. ENT key - Press.

position relative to the glide slope and localizer. The auto-

matic heading select feature of the AFCS is also con-

3-3-29. Transferring Variation from One Location to

trolled through the HSI. Selection of navigational equip-

Another.

ment to be displayed on each HSI is controlled through

the HSI MODE SELECT panel on each instrument panel

The procedure to transfer variation data to the same

below each HSI. Each HSI receives electrical power from

location where the associated stored target coordinates

three different sources (copilots sources are in paren-

has been transferred is the same as in previous para-

theses): 28 volt DC from the No. 2 (No. 1) DC bus through

graph. Transferring Stored Target Coordinates from One

the NAV PLT (COPLT) HSI MODE SEL circuit breaker,

Location to Another, except that the DISPLAY selector is

115 volt AC from the No. 2 (No. 1) AC bus through the

placed at SPH/VAR.

NAV PLT (COPLT) HSI circuit breaker, and 26 volt AC

3-3-13

TM 1-1520-240-10

from the No. 2 (No.1) instrument bus through the NAV

CONTROLS/

FUNCTION

PLT (COPLT) HSI circuit breaker.

INDICATOR

lubber line when the helicop-

3-3-34. Controls and Indicators - Horizontal Situa-

ter heading is the same as

tion Indicators. (fig, 3-3-6)

the selected course.

CONTROLS/

FUNCTION

Range indicator

Digital distance display in ki-

INDICATOR

lometers (KM) to destination

Compass Card

The compass card is a 360_

set on GPS Control Display

Unit (CDU) (para. 3-3-36) or

scale that turns to display

doppler control FLY-TO-

heading data obtained from

DEST thumbwheel (para.

the gyro magnetic compass

3-3-12).

(AN/ASN-43). The helicopter

headings are read at the up-

HDG Knob

Heading select (HDG) knob

per lubber line.

operates in conjunction with

Bearing Pointer No. 1 The pointer operates in con-

the heading bug. It allows

junction with doppler or

the pilot to select any one

mixed GPS/DOPPLER. With

heading. With CMD SEL (fig.

Doppler Only, indicates

3-3-6) selected on the HSI

magnetic bearing to doppler

MODE SELECT panel, the

destination. With mixed

AFCS (chapter 2) will turn

GPS/Doppler, indicates

the helicopter to and main-

magnetic bearing to GPS

tain the selected heading.

destination. (With GPS Only,

HDG Flag

The HDG flag is in view

bearing information is not

when the signal from the

available.)

gyro magnetic compass is

Bearing pointer No. 2 The pointer operated in con-

unreliable or power to the in-

junction with selected VOR

dicator is lost.

or ADF receiver. The pointer

is read against the compass

To-From Arrow

To-from arrow indicates that

card and indicates the mag-

the helicopter is flying to or

netic bearing to the VOR or

away from the selected

ADF station.

VOR.

Course Deviation Indi-

This indicator indicates

NAV Flag

The NAV flag turns with the

cator.

lateral deviation from se-

compass card. The flag will

lected VOR course or GPS/

retract from view when a re-

Doppler computed course or

liable VOR, GPS/Doppler or

heading in the case of FM

FM homing signal is being

homing. When the helicopter

applied to the instrument.

is flying to correct course,

the course indicator will be

Aircraft Symbol

Corresponds to longitudinal

aligned with the course

axis of the helicopter; shows

pointer and will be centered

helicopter position and

on the fixed aircraft symbol.

heading relative to the se-

The two dots on either side

lected course.

of the indicator indicate

amount of course deviation.

Glide Slope Pointer

Displays glide slope position

One dot displacement is

relative to the helicopter or

equivalent to 5_ off VOR or

FM homing signal strength.

GPS/Doppler and 1 1/4 de-

When pointer is above cen-

gree off localizer course.

ter, helicopter is below glide

These displacements do not

slope, conversely when

apply to FM homing.

pointer is below center, heli-

copter is above glide slope.

CRS Knob

The COURSE indicator and

Increasing homing signal

Course Indicator

course pointer operate in

strength is shown by pointer

Course Pointer

conjunction with the course

rising. decreasing signal

selected (CRS) knob, and

strength is shown by pointer

allow the pilot to select any

falling.

VOR course. The course

pointer turns with the com-

Glide Slope (GS)

Indicates loss of or an unre-

pass card and will be

Warning Flag

liable glide slope or FM

aligned with the with the

homing signal.

3-3-14

TM 1-1520-240-10

3-3-35. Horizontal Situation Indicator Mode Se-

d. A MKR BCN light will illuminate during marker bea-

lect. (fig. 3-3-6)

con passage. The light labeled O comes on when pass-

ing through an outer marker beam. The light labeled M

comes on when passing through a middle marker and

The HSI MODE SELECT panel is on each pilots instru-

finally the light labeled I comes on when passing through

ment panel below HSI. The panel allows the pilot to se-

an inner marker. As each light illuminates, a distinctive

lect the navigation mode to be displayed on the HSI,

tone identifying the beacon will be heard over the inter-

command AFCS heading select feature, and visually in-

phone (table 3-2-1). The lights have a press-to-test fea-

dicates marker beacon passage. The panel is divided

ture; pressing any one of the three lamps will cause all

into three sections labeled CRS, BRG, and MKR BCN.

MKR BCN lamps to illuminate on both pilots HSI MODE

SELECT panels.

a. The CRS (course) section consists of four push-

3-3-36. Doppler/GPS Navigation Set AN/ASN-128B

button selector switches labeled VOR SEL, GPS/DOP

(DGNS).

SEL, FM SEL, and CMD SEL. Pressing VOR SEL, GPS/

DOP SEL, or FM SEL causes the output of the selected

The AN/ASN-128B DGNS is an AN/ASN-128 LDNS with

navigation set to be electrically connected to the course

embedded GPS receiver. The AN/ANS-128B in conjunc-

deviation indicator on the corresponding HSI and lights

tion with the aircraft’s heading, vertical references, and

SEL legend in the switch. These switches are electrically

position and velocity updates from its internal GPS, pro-

interlocked so only one set may be selected at a time.

vides accurate aircraft velocity, position and steering in-

Selecting another navigational modes, automatically dis-

formation from ground level to 10,000 feet. The system

engages the mode in use, turns out the SEL legend of the

provides world-wide navigation, with position readout

mode in use, engages the selected mode, and lights the

available in both Military Grid Reference System

SEL legend of the selected mode. Each pilot may inde-

(MGRS) and Latitude and Longitude (LAT/LONG) coor-

pendently select different navigational modes for display

dinates. Navigation and steering is performed using LAT/

on his HSI.

LONG coordinates and a bilateral MGRS-LAT/LONG

conversion routine is provided for MGRS operation. Up

to 100 destinations may be entered in either format and

b. Pressing CMD SEL engages the AFCS heading

not necessarily the same format.

select feature, and will illuminate the SEL legend on the

3-3-37. Controls, Displays and Function.

switch. Due to electrical interlocks between the two HSI

control panels, both CMD SEL switches cannot be en-

The control and displays for the AN/ANS-128B are on the

gaged at the same time. The engaged switch is indicated

front panel (fig. 3-3-7). The function of each control is as

by the lit SEL legend. If the opposite CMD SEL switch is

follows:

pressed when operating with heading select, the HDG on

NOTE

the AFCS panel will release and heading select will be

The MODE switch is locked in the OFF posi-

disengaged. Control of the course deviation indicator in

tion and must be pulled out and turned to get

the VOR mode relative to bearing and course deviation

into or out of OFF position.

to or from a VOR is assigned to the pilot who has CMD

SEL engaged. If the pilot who does not have CMD SEL

CONTROLS/

FUNCTION

engaged makes an adjustment on his CRS knob, it will

INDICATOR

have no effect on the CDI relative to the course.

MODE switch

Selects navigation set mode

of operation.

c. Pressing VOR/ADF pushbutton on the BRG side

OFF

In this position the naviga-

selects the navigational aid, the bearing of which will be

tion set is inoperable; non-

indicated by the HSI No. 2 pointer. The switch is divided

volatile RAM retains stored

into two segments labeled VOR and ADF. If VOR seg-

data.

ment is lit, the No. 2 pointer will indicate the bearing to a

LAMP TEST

Checks operation of all

VOR station to which the VHF navigation set is tuned.

lamps.

Pressing the switch will cause the VOR segment to go

out and the No. 2 pointer will indicate the bearing to the

TEST

Initiates built-in-self-test ex-

station to which the ADF set is tuned out and light the

ercise for the Doppler and

ADF segment. The opposite action occurs if the ADF

GPS functions of the naviga-

tion set.

segment is lit and the switch is pressed.

3-3-16

TM 1-1520-240-10

CONTROLS/

FUNCTION

CONTROLS/

FUNCTION

INDICATOR

MGRS

Selects Military Grid-Ref-

BRT and DIM Keys

Used to brighten or dim the

ence System (MGRS) navi-

light intensity of the LCD dis-

gational mode of operation.

play.

LAT/LONG

Selects latitude/longitude

Four Line Alpha-

Displays alphanumeric char-

navigational mode of opera-

Numeric Display

acters, as determined by the

tion.

setting of the DISPLAY

GPS

Places navigation set in

switch, the MODE switch

LDG

GPS landing mode of opera-

and operation keyboard.

tion. This mode provides

The keys activate function

real-time, tactical precision

upon release and are to be

landing guidance informa-

released immediately after

tion to the HSI indicator.

being depressed.

DISPLAY switch

Selects navigation data for

display.

TGT STR Key

Stores present position data

in the indicated target store/

WIND-UTC

Used for wind speed and di-

memory location (90-99)

DATA

rection, UTC time, sea cur-

when depressed and re-

rent, surface wind, GPS sta-

leased.

tus and data load functions.

KYBD Key

Used in conjunction with the

XTK/TKE

Displays steering (cross

KEY

track distance and track

keyboard to allow data dis-

angle error) information and

play and entry into comput-

GPS variable key status.

er.

Selection of fly to destination

by direct entry of two digit

Keyboard and LTR

Used to set up data for entry

destination number.

Keys

into memory. When DIS-

PLAY switch is set to a posi-

GS/TK

Displays ground speed,

tion in which new data is re-

NAV M

track angle and selection of

quired and KYBD key is

GPS and navigation mode.

pressed, data may be dis-

played on the appropriate in-

Displays present position, al-

put field of display. To dis-

titude and magnetic varia-

play a number, press the

tion.

corresponding key or keys

DIST BRG

Displays distance, bearing

(6 through 9). To display a

TIME

and time information to the

letter, first depress the LTR

destination or course selec-

key corresponding to the

ted. Selection of fly to des-

position of the desired letter

tination can be accom-

on a key. Then depress the

plished by direct entry of two

key which contains the de-

digit destination number.

sired letter. Example: To en-

ter an L, first depress the

Accesses waypoint or target

LTR RIGHT key then de-

TGT

data (landing data, variation,

press the 4 key.

motion). Selection of des-

INC and DEC Keys

Used to increment or decre-

tination for display/entry by

ment the displaced WAY-

direct entry of two digit des-

point/Target number when

tination number.

the DIPLAY switch is set to

DATUM

Accesses datum and steer-

WP/TGT. To access P, de-

press the LTR LEFT key fol-

ROUTE

ing/route functions.

lowed by the 6 key, display

MAL Indicator

Lights when navigation set

waypoint 99 then depress

Lamp

malfunction is detected by

the inc key, or display way-

the built-in test circuitry. In

point 99 then depress the

the event of an intermittent

INC key, or display waypoint

malfunction, the system may

00 key then depress the

operate correctly but must

DEC key. Also used to incre-

be cycled to OFF position

ment or decrement the Fly-

then to on, to extinguish the

To-Destination number when

MAL light.

the DISPLAY switch is

3-3-17

TM 1-1520-240-10

3-3-38. Modes of Operation.

selected and the GPS becomes invalid (para. 3-3-41

above), the AN/ASN-128B will not navigate.

Control of the AN/ASN-128B, including selection of

3-3-43. Doppler Mode.

modes and displays, and entry and readout of data is

performed via the Computer Display Unit (CDU) front

Doppler position and velocity data are used for naviga-

panel. The AN/ASN-128B has four basic modes of op-

tion. If Doppler mode is selected and the Doppler be-

eration: off, navigate, test and GPS landing. In navigate

comes invalid (para. 3-3-41 above), the AN/ASN-128B

mode three submodes may be selected manually or au-

will automatically switch remembered velocity since a

tomatically. These are combined mode (default or prima-

TAS sensor is not available. If Doppler mode is manually

ry mode of operation), GPS only mode, or Doppler only

selected at the start of the flight an initial present position

mode.

must be obtained and entered prior to flight. Navigation

is performed in a latitude/longitude for computational

convenience only. At the same time, distance, bearing

3-3-39. Off Mode.

and time-to-go to any one of 100 preset destinations are

computed (as selected by FLY-TO-DEST.

In the off mode the system is inoperable. However, the

Edge lighting is lighted by an external aircraft power

3-3-44. Test Mode.

source and is independent of the AN/ASN-128B mode

The test mode contains two functions: LAMP TEST, in

switch setting. Edge lighting may not be available if the

which all display segments are lit; and TEST , in which

helicopter is modified with the night vision MWO.

system operation is verified. In lamp test, system opera-

tion is identical to that of the navigate mode except that

all lamp segments and the MAL indicator lamp are lighted

3-3-40. Navigate Mode.

to verify their operation. In TEST, the RTA no longer

transmits or receives electromagnetic energy; instead,

In the navigation mode (MGRS or LAT/LONG) position of

self generated test signals are inserted into the electron-

the CDU MODE switch) power is applied to all system

ics to verify operation of the DRVS. At this time a self test

components, and all required outputs and functions are

is performed by the GPS and navigation computations

provided. The Doppler radar velocity sensor (DRVS)

continue using remembered velocity. In the TEST mode,

measures aircraft velocity, and converts analog heading,

Doppler test results are displayed on the CDU front panel

pitch and roll into digital form. This data and Embedded

for the first 15 seconds (approximate). At the end of this

GPS Receiver (EGR) velocity and position data are then

period either GO ALL is displayed if there is no malfunc-

sent to the CDU for processing. Baro altitude is used for

tion in the navigation set, or a failure code is displayed if

aiding the GPS when only three space vehicles are avai-

a malfunction has occurred. A rotating bar on the display

lable. Present position is computed by using one of three

indicates that the GPS has not completed self test. If the

navigation submodes which can be selected manually or

navigation set is maintained in the TEST mode, no navi-

automatically. These submodes are as follows:

gation data can be displayed on the CDU front panel. If

a Doppler malfunction is detected, the MAL indicator

lamp lights and DF is displayed. At the completion of

3-3-41. Combined Mode (Default or Primary Mode of

GPS self test (up to two minutes), The rotating bar is

Operation).

replaced with a complete test result code. the failed unit

and the failed circuit card are also indicated by a code on

Doppler and GPS position and velocity data are com-

the CDU display.

bined to provide navigation. This mode is used when a

minimum of three (with baro) or four space vehicles are

The CDU is continuously monitored for failures, using its

available. GPS Estimated Position Error (EPE) is less

own computer as built-in-test-equipment (BITE). Any

than approximately 150 meters, and the Doppler is not in

BITE malfunction the MAL indicator lamp on the CDU to

memory. If GPS becomes invalid (e.g., due to increased

light. If the MODE switch on the CDU is set to TEST,

EPE), the AN/ASN-128B will automatically switch to

identification of the failed LRU is indicated by a code on

Doppler mode until a valid GPS status is received. If the

the display panel. Aircraft heading, pitch and roll are also

displayed in this mode by depressing the ENT key after

Doppler becomes invalid (e.g., flight over glassy smooth

Doppler test is completed. GPS test status is displayed

water causing memory), the AN/ASN-128B will automati-

if the ENT key is depressed a second time. Malfunction

cally switch to GPS mode if GPS is valid or an alternate

codes are automatically latched and can only be cleared

Doppler mode if the GPS is not valid.

by recycling the CDU power via the CDU mode switch

(OFF/ON).

3-3-42. GPS Mode.

3-3-45. GPS Landing Mode.

GPS positions and velocities are used for navigation by

In the GPS landing mode, the Doppler navigation system

the Doppler navigation processor in the CDU. If GPS

provides information to the HSI indicator for real-time

mode is

landing guidance to a touch down point previously en-

3-3-19

TM 1-1520-240-10

tered in any of the 100 fly-to destinations. The landing

b. Target-of-opportunity can be stored by pressing

approach is determined by present position and the en-

TGT STR (target store) key when the target is overflown.

tered touch down altitude, glideslope and inbound ap-

This operation stores the coordinates of the target in one

proach course.

of ten destination locations in the computer; locations 90

through 99 sequentially incrementing each time the TGT

3-3-46. CDU Operation.

STR key is depressed. The location is displayed in the

appropriate display field. The computer can keep track of

Various required operating data, such an initial present

individual target positions which may include speeds and

position (if GPS is not valid or Doppler mode is selected).

directions input by the operator.

destination coordinates with or without GPS landing

c. Self test of the AN/ASN-128B is accomplished

data, and magnetic variation can at any time be entered

using built-in-test-equipment (BITE) with the RTA, SDC,

into the CDU via its keyboard, or the dataloader via the

and CDU units connected an energized for normal op-

preprogrammed dataloader cartridge. In most cases,

eration. Self test enables the unit to isolate failures to one

these data will be entered before the aircraft takes off.

of the four main functions (RTA, SDC, CDU or EGR) or

to one of the circuit cards in the SDC or CDU. Self test is

accomplished as follows: Self test of the AN/ASN-128B

a. The GPS provides present positions to AN/

is accomplished using built-in-test-equipment (BITE)

ASN-128B. If GPS is not available or Doppler is selected

with the RTA, SDC, and CDU units connected an ener-

present position can be initialized as follows:

gized for normal operation. Self test enables the unit to

isolate failures to one of the four main functions (RTA,

(1)

The MODE switch should be set to MGRS or

SDC, CDU or EGR) or to one of the circuit cards in the

LAT/LONG, the WT/TGT display position of the DISPLAY

SDC or CDU. Self test is accomplished as follows:

switch is selected, the destination number is set to P and

KYBD key is pressed. The coordinates of the initial posi-

(1)

The CDU (except for the keyboard and dis-

tion is overflown, the ENT key is pressed. The computer

play) is checked on a continuous basis, and any failure

then determines changes from the initial position contin-

is displayed by illumination of the MAL indicator lamp on

uously, and the coordinates of the current present posi-

the CDU. If the MODE switch on the CDU is set to the

tion can be read either by remaining in this configuration

TEST position, identification of the failed circuit card in

or by setting the DISPLAY switch to PP (present position)

the CDU is indicated by a code on the display panel.

and the MODE switch to MGRS or LAT/LONG.

(2)

The DRVS and EGR are tested by setting

(2)

To update present position over a stored

the MODE switch on the CDU to the TEST position.

destination, KYBD key is depressed and released when

Failure of the DRVS or EGR are displayed on the CDU

the aircraft overflies this destination. If an update is de-

by illumination of the MAL indicator lamp, and identifica-

sired, the ENT key is depressed and released and the

tion of the failed unit or circuit card is indicated by a code

update is completed. The DISPLAY switch is in the DIST/

on the display panel of the CDU.

BRG/TIME position and the FLY-TO-DEST is set to this

(3)

Continuous monitoring of the Signal Digital

destination during this process. The distance-to-go, dis-

Data Converter and Receiver Transmitter Antenna is

played while over the stored destination, is the position

provided by the system status indication. The system will

error of the system at that moment.

not use Doppler velocities in normal operation when fly-

ing over glassy smooth water. However, if the system

(3)

To update present position over fixed point

continues to not use Doppler (e.g., using GPS only when

not previously stored in the computer, the DISPLAY

combined has been selected) for excessive periods of

switch is placed PP and KYBD key is depressed and

time (e.g. more than10 minutes) over land or rough wa-

released as the fix point is overflown. This freezes the

ter, then a malfunction may exist in the navigation set and

display while allowing computation of changes in present

the operator should set the MODE switch to TEST to

position to continue within the computer. If an update is

determine the nature of failure.

required, the coordinates of the fix point are entered via

the keyboard, and ENT key is pressed. The position

(4)

The display portion of the CDU is tested by

change which occurred since over-flying the fix point

illuminating all the lamp segments in each alphanumeric

automatically added to the fix point coordinates to com-

characters in the LAMP TEST mode.

plete the position update.

(5)

Keyboard operation is verified by observing

(4)

Magnetic variation can be entered for each

the alphanumeric characters as the keyboard is exer-

destination, and the system will compute present posi-

cised.

tion magnetic variation. If operation is to occur in a region

3-3-47. Route Sequencing Modes.

with relatively constant magnetic variation, the operator

enters magnetic variation only for present position and

The system has the ability to fly a preprogrammed se-

the computer will use this value throughout the flight. If

quence of waypoints. This sequence can be either con-

MGRS data are to be entered or displayed, the MGRS

secutively numbered in which case a start and end way-

datum of operation is also entered.

point are entered or randomly numbered in which case

3-3-20

TM 1-1520-240-10

all waypoints are put in a list and the start and end way-

c. Destination Variation Constraint. The magnetic

points are entered. Both sequence modes can be flown

variation associated with a destination must be entered

in the order they are in the list or in reverse order. Direc-

AFTER the coordinates for that destination are entered.

tions will be displayed to the waypoint next on the list until

The order of entry for present position is irrelevant.

approximately 10 seconds before overflying the way-

d. Impossibility of Entering Unacceptable Data. In

point at which time the display will advance to the next

most cases the computer program will reject unaccept-

waypoint and the new waypoint number will blink for ten

able data (for example, a MGRS area W1 does not exists

seconds. One consecutive and one random sequence

and will be rejected). If the operator attempts to insert

may be stored in the system.

unacceptable data, the unacceptable data will be dis-

played on the panel and then the selected field will blink

3-3-48. To-To Route Mode.

after ENT key is pressed displaying the last valid data.

NOTE

The system has the ability to provide steering information

onto a course defined by the start and end waypoints.

The computer cannot prevent insertion of er-

Only the second waypoint will be overflown. The distance

roneous data resulting, for example, from hu-

displayed is the distance to the course when outside 2

man or map errors.

nautical miles of the course and the distance to the sec-

e. Procedure for Displaying Wind Speed and Direc-

ond waypoint when inside 2 nautical miles of the course.

tion.

NOTE

3-3-49. General Operating Procedures for Entering

Data.

In MGRS mode, wind speed is displayed in

km/hr; in LAT/LONG mode, wind speed is dis-

The panel display consists of four line LCD readout. The

played in knots. Wind direction is defined as

top line of the display is reserved for the display of Fly-To-

the direction from which the wind originates.

destination number and destination name/International

(1)

Set MODE switch to LAT/LONG (MGRS

Civil Aeronautic Organization (ICAO) identifier, EPE in

may also be used).

meters, mode of GPS and mode of AN/ASN-128B opera-

(2)

Set DISPLAY switch to WIND-UTC/DATA

tion and target store number. The remaining lines will

and observe display.

display data in accordance with the DISPLAY and MODE

switches. When depressing the KYBD key for the first

(3)

The display indicates:

time in an entry procedure, the display freezes, kybd is

displayed in the bottom right corner indicating the display

SP;XXXKn

is in the keyboard mode and the input field under key-

DIR:XXX_

board control blinks. If it is not desired to change the

f. Procedure for Displaying/Entering UTC and Dis-

display field under control, the pilot can advance to the

playing GPS Status.

next field of the display by depressing the KYBD key

again. Depressing ENT key (whether or not new data has

(1)

Set MODE switch to LAT/LONG (MGRS

been entered) causes the display to blank momentarily

may also be used).

and return with the latest computed data. To abort a

(2)

Set DISPLAY switch to WIND-UTC/DATA

keyboard operation, move the mode or display switch to

and observe the wind speed/direction display.

another position.

(3)

Depress ENT key. Observe that the CDU

NOTE

display indicates year XX, day XXX and indicates hours,

minutes, and seconds of UTC time: XX Hours, XX Min-

All keys activate upon release after being de-

utes, XX Seconds.

pressed. Keys should be depressed and im-

mediately released in one continuous motion.

(4)

To enter year, day, and time depress the

KYBD key to select the field for input shown as a blinking

a. Data Entry. To display a letter, first depress the LTR

field, enter the desired data and depress the ENT key.

key corresponding to the position of the desired letter on

a key. Then depress the key which contains the desired

(5)

To display GPS status depress the ENT to

letter. For example, to enter an L, first depress The LTR

display selection menu.

RIGHT key, then depress the 4 key.

1>SEA CURRENT

2>SURFACE WIND

b. Keyboard Correction Capability. The last charac-

3>GPS STATUS

ter entered may be cleared by depressing the CLR key.

4>DATA LOAD end

If the CLR key is depressed twice in succession, the field

is cleared but remains under control (indicated by blink-

(6)

To select the GPS STATUS page depress

ing) and the last valid data entered is displayed.

the 3 key.

3-3-21

TM 1-1520-240-10

(7)

Observe the CDU display. The display indi-

NOTE

cated the GPS test mode status as of one of the follow-

Destinations are entered manually when

ing.

steering information is required to a destina-

GPS TEST: IN PROCESS

tion that was not in the set of data loaded via

GPS TEST: NOT RUN

the data loader, or it is desired to update pres-

GPS TEST: PASSED

ent position by overflying a destination, or a

GPS TEST: FAILED

present position variation computation is de-

sired. (See CDU operation). If a present posi-

g. Procedure for Displaying GPS Key and GPS

tion variation update is desired, destination

Space Vehicle Status.

variation must be entered. The operator may

enter one or more destination variations; it is

(1)

Set the DISPLAY switch to XTK/TKE/KEY.

not necessary for all destinations to have as-

(2)

Set the MODE switch to LAT/LONG (MGRS

sociated variations entered and also not nec-

may also be used).

essary to enter all destinations in any case,

but variations must be entered AFTER des-

(3)

The display indicates GPS daily key status,

tination coordinates are entered.

time remaining on the currently entered keys and how

The Doppler outputs true heading and accepts magnetic

many Space Vehicles (SV) are currently being used by

heading from gyromagnetic heading reference. If accu-

the GPS.

rate magnetic variations are not applied, then navigation

accuracy will be affected.

KEY

STATUS

TIME

REMARKS

b. System Initialization

Days or hours still GPS daily key

available on key

in use and

(1)

Enter GPS mode “M”.

verified.

NOTE

No GPS daily

You must select GPS mode “M” during initial-

key available

ization. If “Y” mode is selected before Crypto-

Key variables are loaded the system will lock-

GPS daily key

up forever.

available but

not verified.

You must select GPS mode “M” during initial-

ization. If “Y” mode is selected before Crypto-

Key variables are loaded the system will lock-

3-3-50. Preflight Procedures.

up forever.

a. Data Required Prior to DGNS Turn-on

(2)

Perform self test (para d. below).

The following initial data must be entered by the pilot after

(3)

Perform download (para c. below) of data

system turn-on and initialization, unless previously en-

loader cartridge if necessary, or manually enter datum,

tered data is satisfactory:

destinations, magnetic variations, and present position

(para. f or g. below).

Datums of operation, when using MGRS coordinates.

This data may be part of the data load if preprogrammed.

(4)

Load Crypto-Key variables (unless pre-

viously loaded and still valid) necessary for operation of

In combined or GPS mode the GPS provides preset posi-

the GPS in Y mode.

tion. If Doppler only mode is selected MGRS coordinates

of present position - zone area, easting and northing;

NOTE

latitude/longitude coordinates may also be used to input

It is necessary to wait at least 12 minutes for

present position. This data may be part of the data load

key validation when new keys have been en-

if preprogrammed. Variation of present position to the

tered, or collection of almanac data when set

nearest one-tenth of a degree.

has no previous almanac data. During this

Coordinates of desired destinations 00 through 99. It is

time the GPS operating mode must be M and

not necessary to enter all destinations in the same coor-

uninterrupted. After this time the GPS operat-

dinate system. This data may be part of the data load if

ing mode may be switched to Y. Observe the

preprogrammed.

GPS Key status and number of SVs tracked

after switching to Y mode. If the SV number

Variation of destinations to the nearest one-tenth of a

goes to zero repeat this procedure. The Key

degree.

status shall switch from DK IN to DK OK

sometime during the 12 minutes.

Crypto-Key variables necessary to enable the GPS re-

ceiver to operate in Y code are entered via remote fill data

(5)

Check datum of operation, if MGRS is being

only and not via the CDU keyboard.

used.

3-3-22

TM 1-1520-240-10

(6)

Check destinations in MRGS or LAT/LONG

DATA LOADER

coordinates as desired.

ENTER DATA:N

(7)

Check associated destination variations as

end

desired. Remove all incorrect variations by setting DIS-

(7)

To begin the download depress the KYBD

PLAY switch to WP/TGT, setting the destination number

and enter Y (yes).

to appropriate destination, and depressing the KYBD key

and ENT key in that order. Variations of at least two

(8)

Observe the CDU display. The CDU shall

destinations must be entered for automatic variation up-

display DOWNLOAD WAYPTS and WAIT ACK. If a

date computation to be performed. For accurate naviga-

transmission error occurs the CDU display shall change

tion it is advised to enter variation after each destination

to ERROR-RETRYING.

unless the variations are the same.

(9)

When the transmission is complete the CDU

shall display DOWNLOAD WAYPTS COMPLETE. If this

display is not obtained within one minute of beginning the

(8)

Select DGNS operating mode (para e. be-

download check the data programming and connection.

low).

(10) Set the CDU mode switch to OFF, remove

NOTE

the data loader cartridge if desired, and then set the CDU

mode switch to desired setting.

The set will automatically select combined

mode (default or primary operating mode) as

d. Self-Test

this allows the system to select the best pos-

(1)

Set the MODE switch to LAMP TEST. Enter

sible navigation method available.

GPS mode “M” or “Y”. Verify the following:

(9)

Set the FLY-TO DEST to the desired des-

(a) All LCD on four-line display are illumi-

tination location.

nated.

c. Procedure for Downloading Data From Dataload-

(b) The MAL lamp is illuminated.

er Cartridge.

(2)

Rotate the center lighting control. Verify the

(1)

Set the CDU mode switch to OFF.

following:

(2)

Insert the preprogrammed data loader car-

(a) All edge lighting is illuminated.

tridge.

(b) All keyboard keys are illuminated.

(3)

Set the CDU mode switch to MGRS (LAT/

(3)

Set MODE switch to TEST.

LONG may be used). Enter desired GPS code (M or Y)

(a) While test is performing, depress the

mode of operation.

DIM pushbutton several times, then the BRT pushbutton

(4)

Set the DISPLAY switch to WIND-UTC/

several times. The LCD display should glow dimmer then

DATA.

brighter. Adjust LCD display for comfortable viewing.

(b) After Doppler and/or GPS self test have

(5)

To display the select menu depress the ENT

completed (approximately 15 seconds for Doppler, up to

key twice.

2 minutes for GPS), one of the following displays will be

1>SEA CURRENT

observed in the left and right displays:

2>SURFACE WIND

NOTE

3>GPS STATUS

In the event the TEST mode display is not GO

4>DATA LOAD end

ALL the system should be recycled through

(6)

To select the DATA LOADER page depress

OFF to verify the failure is to a momentary

the 4 key.

one.

3-3-23

TM 1-1520-240-10

LEFT DISPLAY

RIGHT DISPLAY REMARKS

Doppler has completed Built in Test (BIT) and is operating satisfactorily,

GPS is still performing BIT (GPS has 2 minute BIT cycle maximum).

Note that a rotating bar in the display indicates that the GPS is still per-

forming self test.

ALL

The entire system has completed BIT and is operating satisfactorily.

Pitch or Roll data is missing or exceeds 90_. In this case, pitch and roll in

the computer are both set to zero and navigation in the Doppler mode

continues with degrade operation. Problem may be in the vertical gyro or

aircraft cabling.

C, R, S, or H fol-

A failure has occurred in the Computer Display Unit or the Signal Data

lowed by a nu-

Converter Power Supply. The operator should not use the system.

meric code

GPS failure code

GPS has failed but operator can use doppler to perform all navigation.

Doppler failure

Doppler has failed. GPS is still performing self test.

code

Doppler failure

Doppler has failed but operator can use GPS to perform all navigation.

code

e. Procedure for Displaying or Selecting GPS M or Y

are automatic fall back modes used when

Operating Mode, Doppler, GPS, or Combined Operation,

both the Doppler and GPS are unavailable.

and Displaying Groundspeed and Track.

(4)

Selection of GPS mode of operation:

(1)

Set MODE switch to MGRS position (LAT/

As an example, consider selection of Y-only mode. De-

LONG or GPS LDG position may also be used).

press KYBD key. Observe that the GPS mode blinks. To

enter Y (for Y mode) depress key LTR LEFT followed by

(2)

Set DISPLAY switch to GS/TK/NAV M.

key 9. A Y will be displayed. Depress ENT key. The entire

display will blank out for less than one second and the

(3)

The display indicates the current GPS and

center display will now indicate: Y.

navigation mode on the top line:

(5)

Selection of DGNS mode of operation.

(a) Selected Fly to waypoint.

As an example, consider selection of GPS-only mode of

(b) EPE (GPS Estimated Position Error in

operation. Depress KYBD key twice. Observe that the

Meters. An asterisk (*) in the character position of the

DGNS mode blinks. To enter G (for GPS mode) depress

EPE display indicates an EPE of greater than 999 or data

key LTR LEFT followed by key 3. A G will be displayed.

unavailable.

Depress ENT key. The entire display will blank out less

than one second and the DGNS Mode will now indicate:

G (or * if GPS is not available).

M for mixed C\A and P/Y code GPS reception

Y for only Y code GPS reception.

(6)

Ground Speed and Ground Track Angle are

displayed on lines 3 and 4.

(d) DGNS mode of operation:

f. Procedure for Entering/Displaying Present posi-

C for combined Doppler and GPS

tion or One of the 100 Possible Destinations in MGRS.

D for Doppler only

G for GPS only

The DGNS has the capability to display 100 destinations

R for remembered velocities

(numbered 00 through 99).

* for no navigation.

100 destinations

(e) Target destination where the present

position will be stored next time TGT/STR is depressed.

-00 to 69

Standard Waypoints

-70 to 89

Data Load-only Waypoints, Ob-

NOTE

servable but not changeable via

CDU keyboard. Used for Nation-

In MGRS mode, ground speed is displayed in

al Airspace Data Such as VORs,

km/hr; in LAT/LONG mode, ground speed is

NDB’s and intersections.

displayed in knots.

-90 to 99

Target Store Waypoints (Usable

Only mode C, G, and D may be selected as

as Standard Waypoints)

the primary navigation mode. Modes R and *

3-3-24

TM 1-1520-240-10

As an example, consider display of destination number

-70 to 89

Data Load-only Waypoints, ob-

25.

servable but not changeable via

CDU keyboard. Used for Nation-

(1)

Enter datum as described in paragraph j be-

al Airspace Data Such as VORs,

low.

NDB’s and intersections.

(2)

Set MODE switch to MGRS.

-90 to 99

Target Store Waypoints (Usable

as Standard Waypoints)

(3)

Set DISPLAY switch to WP/TGT.

(4)

Notice the current destination number dis-

As an example, consider display of destination number

played. To display destination number 25 depress the

25.

INC or DEC keys, or depress keys 2 then 5. this is a direct

key entry action.

(1)

Enter the datum as described in paragraph

(5)

Observe that the current destination MGRS

j. below.

zone, area, and easting/northing coordinates are now

displayed. The destination number 25 and location

(2)

Set MODE switch to LAT/LONG.

name/ICAO identifier also appears in the display.

(6)

Entry for destination coordinates and loca-

(3)

Set DISPLAY switch TO WP/TGT.

tion name/ICAO identifier: As an example, consider entry

of zone 18T, area WN, easting 5000, northing 6000, and

(4)

Notice that the current destination number is

ICAO identifier BANDO.

displayed. To display destination number 25 depress the

INC or DEC keys, or depress keys 2 then 5. This is a

(7)

To enter keyboard mode depress the KYBD

direct key entry action.

key. Observe “kybd” displayed in the bottom right corner

of the display. (Destination number blinks.) Depress

KYBD again. (Zone field blinks.) To enter 18T depress

(5)

Observe that the current Latitude and Longi-

keys 1, 8, LTR MID, 7.

tude coordinates are now displayed. The destination

number 25 and location name/ICAO identifier appears in

(8)

Depress KYBD. (Area and northing/easting

the display.

blinks.) To enter WN5000 6000 depress keys LTR MID,

8, LTR MID, 5, KYBD, 5, 0, 0, 0, 6, 0, 0, 0.

(6)

Entry of destination coordinates and loca-

tion name/ICAO identifier: As an example, consider entry

(9)

Depress KYBD. (Location name/ICAO iden-

tifier blinks.) To enter BANDO depress keys LTR MID, 1,

of Latitude N41_ 10.13 minutes and longitude E035_

LTR LEFT, 1, LTR MID, 5, LTR LEFT, 2, LTR RIGHT, 5.

50.27 minutes and ICAO identifier BANDO.

(10) To store the displayed information into the

(7)

To enter keyboard mode depress KYBD key.

selected destination display position depress the ENT

Observe “kybd” displayed in the bottom right corner of

key.

the display. (Destination number blinks.) Depress KYBD

NOTE

again (Latitude field blinks.) To enter N41_ 10.13 depress

keys N, 4, 1, 1, 0, 1, 3.

To access P, depress the LTR LEFT key fol-

lowed by the 6 key. Another way to access P

(8)

Depress KYBD. (longitude field blinks.) To

is to display waypoint 99 then depress the INC

enter E035_ 50.27 depress keys E, 0, 3, 5, 5, 0, 2, 7.

key or display waypoint 00 then depress the

DEC key.

(9)

Depress KYBD. (Location name/;ICAO

Way points cannot be recalled by location

identifier blinks.) To enter BANDO depress keys LTR

name/ICAO identifier.

MID, 1, LTR LEFT, 1, LTR MID, 5, LTR LEFT, 2, LTR

g. Procedure for Entering/Displaying Present Posi-

RIGHT, 5.

tion or one of the 100 Possible Destinations in LAT/

LONG.

(10) To store the displayed information into the

selected destination display position depress the ENT

The DGNS set has the capability to display 100 destina-

key.

tions (number 00 through 99).

Display indicates:

100 destinations

-00 to 69

Standard Waypoints

N41_ 10.13 E035_ 50.27.

3-3-25

TM 1-1520-240-10

NOTE

(10) Depress the KYBD key to blink the inbound

approach course field. Enter a three digit inbound ap-

To access P, depress the LTR LEFT key fol-

proach course angle. In the example enter 2, 7, 0 to enter

lowed by the 6 key. Another way to access P

a 270 degree inbound approach course. Depress the

is to display waypoint 99 then depress the INC

ENT key to complete the operation.

key or display waypoint 00 then depress the

DEC key.

i. Procedures for Entering Target Motion and Direc-

tion

Waypoints cannot be recalled by location

name/ICAO identifier.

In MGRS mode, target speed is entered in km/h; in LAT/

LONG mode, target speed is entered in knots.

h. Procedures for Entering Variation and Landing

Mode Data.

(1)

Set the MODE switch to LAT/LONG (MGRS

may be used).

(1)

Set MODE switch to MGRS position-altitude

entered/displayed in meters (LAT/LONG may also be

(2)

Set the DISPLAY switch to WP/TGT and se-

used-altitude entered/displayed in feet).

lect the target number desired (00-69 or 90-99) by direct-

ly entering the two digit target number or INC/DEC keys.

(2)

Set DISPLAY switch to WP/TGT position.

Observe the waypoint number entered and position

data.

(3)

Select the waypoint desired by directly en-

(3)

Depress the ENT key and observe the way-

tering the two digit target number or depressing the INC/

point number, variation and/or landing data if entered.

DEC keys. Observe the waypoint number entered and

position data.

(4)

Depress the ENT key and observe the target

speed and direction page.

(4)

Depress the ENT key and observe the way-

point number, variation and/or landing data if entered.

(5)

To select target speed depress the KYBD

key twice and enter the target speed. The maximum

(5)

To enter a magnetic variation and/or landing

target speed that may be entered is 50 knots. Fill leading

mode data depress the KYBD key to select the field for

zeros before entering.

entry and enter the desired data as shown in steps 6

through 10 below. To end the entry operation depress the

(6)

To select the target direction depress the

ENT key.

KYBD key and enter the target direction.

(7)

To end the entry operation depress the ENT

(6)

Entry of variation: as an example, consider

key. At the time ENT key is depressed and released, the

entry of a variation of E001.2. Depress keys E, 0, 0, 1,

target position will begin to be updated as a function of

and 2. The decimal point is inserted automatically. If no

time based on the speed and direction entered.

landing mode data is to be enter depress ENT to com-

plete the operation. Display indicates: E001.2_.

NOTE

To abort/cancel an entry of target motion, en-

ter a target speed of 000 using the above

An asterisk appearing in the variation fielded

procedure.

indicates the variation is not entered. Varia-

j. Procedure for Entering/Displaying Datum or

tions may not be entered for waypoints con-

Cleaning All Waypoints.

taining target motion.

(1)

Set the MODE switch to MGRS position

(7)

The bottom two lines indicate the MSL alti-

(LAT/LONG may also be used).

tude, desired glideslope, and the desired inbound ap-

proach course (IAC) to the indicated destination. As an

(2)

Set the DISPLAY switch to DATUM/

example, consider entry of a glideslope of 8_ an IAC of

ROUTE.

270_ and an altitude of +230 meters, for destination num-

ber 25.

(3)

To select the datum field depress the KYBD

KEY.

(8)

Depress the KYBD key to blink altitude field.

(4)

Entry of datum: as an example consider

Depress the INC/+ key to enter a positive altitude, de-

entry of 25. Depress keys LTR 2, 5. Depress the ENT key.

press keys 2, 3, 0 (the leading zeros may be omitted) for

The display shall show DATUM:25.

the altitude of 230 meters in the example.

(5)

To clear all waypoints, variations, landing

(9)

Depress the KYBD key to blink the glide

data and target motions, enter RDW for the spheroid.

slope field. Enter glideslope. The maximum allowable

glideslope is 9 degrees. In the example enter 8 for an

k. Procedure for Entering Sea Current Speed and

eight degree glideslope.

Direction for Water Motion Correction.

3-3-26

TM 1-1520-240-10

NOTE

(1)

Set MODE switch to LAT/LONG (MGRS

may also be used).

In MGRS mode, wind speed is displayed in

km/hr; in LAT/LONG mode, wind speed is dis-

(2)

Set DISPLAY switch to WIND-UTC/DATA

played in knots. Leading zeros must be enter-

and observe the wind speed/direction display.

ed. Sea current direction is defined as the

(3)

Depress ENT key twice to display the selec-

direction the current is flowing.

tion menu.

(1)

Set MODE switch to LAT/LONG (MGRS

may be used).

1>SEA CURRENT

2>SURFACE WIND

(2)

Set DISPLAY switch to WIND-UTC/DATA

3>GPS STATUS

and observe the standard wind speed and direction dis-

4>DATA LOAD end

play.

(4)

Depress the 2 key to select SURFACE

(3)

Depress the ENT key twice to display the

WIND. The display indicates:

selection menu.

SURFACE WIND

SP:XXXKn

1>SEA CURRENT

DIR:XXX_

2>SURFACE WIND

3>GPS STATUS

(5)

Entry of wind speed and direction: as an

4>DATA LOAD end

example, consider the entry of 20 knots and 150 de-

grees. Depress KYBD key. Observe that the wind speed

(4)

Depress the 1 key to select SEA CURRENT.

field blinks.

The display indicates:

(6)

To enter speed, depress keys 0, 2 and 0. The

SEA CURRENT

wind speed indicates 020. The maximum surface wind

SP;XXXKn

speed is 50 knots.

DIR:XXX_

(7)

Depress KYBD key. The direction display

(5)

Entry of sea current speed and direction: as

blinks.

an example, consider the entry 4 knots and 135 degrees.

Depress KYBD key. Observe that the speed field blinks.

(8)

To enter direction, depress keys 1, 5, and 0.

Wind direction indicates 150_.

(6)

To enter speed, depress keys 0, 0 and 4. The

(9)

Depress ENT key. The display momentarily

speed indicates 004Kn. The maximum sea current

blinks and then reappears.

speed that may be entered is 50 knots.

NOTE

(7)

Depress KYBD key. The direction display

blinks.

To abort entry of surface wind speed and di-

rection, enter a surface wind speed of 000

(8)

To enter direction, depress keys 1, 3, and 5.

using the above procedure.

Direction indicates 135_.

3-3-51. Flight Procedures.

(9)

Depress ENT key. The display momentarily

NOTE

blinks and then reappears.

This procedure is applicable to the Doppler

NOTE

only mode. Present position is automatically

updated when DGNS is in combined mode.

To abort entry of sea current, enter a sea cur-

a. Updating Present Position from a Stored Destina-

rent speed of 000 using the above procedure.

tion.

l. Procedure for Entering Surface Wind Speed and

NOTE

Direction for Water Motion Correction.

The preface is: The aircraft is flying to a des-

NOTE

tination, that is, the FLY-TO Destination is set

Not required or necessary when in combined

to the number of the desired destination.

or GPS mode. In MGRS mode, surface wind

(1)

Set DISPLAY switch to DIST/BRG/TIME

speed is entered in km/hr: in LAT/LONG

position. Distance, bearing and time-to-go to the fly-to

mode, surface wind speed is entered in knots.

destination are displayed.

Leading zeros must be entered. Wind direc-

tion is defined as the direction from which the

(2)

When the aircraft is over the destination,

wind originates.

depress KYBD key. Observe that the display freezes.

3-3-27

TM 1-1520-240-10

(3)

Position update can be effected by depress-

Method 2 (Anticipated update)

ing the ENT key. The computer updated the present posi-

1. Set DISPLAY switch to WP/TGT position.

tion at the time the KYBD key was depressed by using the

2. Access P by depressing the LTR LEFT key

stored destination coordinates, and adding to them the

followed by the 6 key, entering destination

distance traveled between the time the KYBD key was

00 then depressing the DEC key, or enter-

depressed and the ENT key was depressed. In addition,

ing destination 99 then depressing the INC

if an associated variation for the stored destination ex-

key.

ists, the present position variation is also updated.

3. Depress KYBD key. Observe that the dis-

play freezes.

4. Manually enter the landmark coordinates

(4)

If a present position update is unnecessary

by depressing the KYBD key to blink the

(as indicated by an appropriately small value of DIS-

field to be changed and enter the coordi-

TANCE to go on overflying the destination), set the DIS-

nates.

PLAY switched to some other position - this action aborts

5. When overflying landmark, depress ENT

the update mode.

key.

6. If an update is not desired, set the DISPLAY

b. Updating Present Position from a Landmark.

switch to some other position. This action

aborts the update mode.

NOTE

3-3-52. Fly-To Destination Operation.

a. Initialization of Desired Course.

There are two methods for updating present

When a fly-to destination is selected such as at the start

position from a landmark. Method 1 is particu-

of a leg, the present position at the time is stored in the

larly useful if the landmark comes up unex-

computer. A course is then computed between the se-

pectedly and the operator needs time to de-

lected point and the destination. If the aircraft deviates

termine the coordinates. Method 2 is useful

from this desired course, the lateral offset or crosstrack

when a landmark update is anticipated.

distance error is computed.

Distance and bearing to destination, actual track angle,

Method 1 (Unexpected update)

and track angle error correction are computed from pres-

ent position to destination. See figure 3-3-8 for graphic

(1)

Set DISPLAY switch to PP position.

definition of these terms.

b. Procedure for Selecting One of 100 Possible Fly-

To Destinations (Direct Mode).

(2)

Overfly landmark and depress KYBD key.

The Doppler/GPS navigation set has the capability of

The present position display shall freeze.

selecting a fly-to destination from 100 destinations (num-

ber 00 through 99).

(3)

Compare landmark coordinates with those

As an example, consider selecting Fly-To destination

on display.

number 43.

(1)

Set MODE switch to MGRS (LAT/LONG or

GPS LDG may also be used).

(4)

If the difference warrants an update, enter

(2)

Set DISPLAY switch to XTK/TKE. Observe

the landmark coordinates by depressing the KYBD key

e standard Cross Track (XTK) and Track angle error

to blink the field to be changed, enter coordinates, then

(TKE) display. (DIST/BRG/TIME may also be used)

depress the ENT key. The computer updates the present

position (from the time the KYBD key was depressed) to

(3)

To display Fly-To destination 43 depress the

INC or DEC keys, or depress keys 4 then 3. This is a

the landmark coordinates, and adds to the updated pres-

direct key entry action.

ent position the distance traveled between the time the

Left-Right Steering Signals

KYBD key was depressed and the ENT key was de-

pressed.

There are two methods the pilot may use to fly-to destina-

tion, using left-right steering signals displayed on the

computer-display unit. Left-right steering signals may be

(5)

If an update is not desired, set the DISPLAY

used when flying the shortest distance to destination

switch to some other position. This action aborts the

from present position (Method 1) or when flying a ground

update mode.

track from start of leg to destination (Method 2).

3-3-28

TM 1-1520-240-10

Figure 3-3-8. Graphic Definition of Course Terms

METHOD 1

been selected then the pilot may use the “#1”

needle and course deviation indicator (CDI)

When flying shortest distance to destination from

for navigation to the Fly-To destination se-

present position, set DISPLAY switch to DIS/BRG/

lected on the CDU.

TIME position and steer vehicle to bearing dis-

Select CDI by depressing, then releasing the DPLR GPS

played. As an aid to maintaining course, set DIS-

lens on the HSI Mode Select PAnel.

PLAY switch to XTK/TKE position and steer

aircraft to keep track angle error (TKE) nominally

c. Procedure to Enter Route-Sequence To-To Mode

zero. If the display indicates a L (left) TKE, the

aircraft must be flown to the left to zero the error.

The Doppler/GPS navigation set has the capability to

navigate a course set up between to destinations.

METHOD 2

As an example, consider navigation onto a course start-

When flying a ground track, set DISPLAY switch

ing from destination number 62 and ending at destination

to XTK/TKE position. Steer vehicle to obtain zero

number 45.

for crosstrack error (XTK). If XTK is left (L), aircraft

(1)

Set MODE switch to MGRS (LAT/LONG

is to right of the desired course and must be flown

may also be used).

to the left to regain the initial course.

NOTE

(2)

Set DISPLAY switch to DATUM/ROUTE.

Since the aircraft has the Horizontal Situation

(3)

Depress the ENT key. Observe that a menu

Indicator (HSI) and when the Doppler has

of special steering functions appears.

3-3-29

TM 1-1520-240-10

(4)

To select the Route-Sequence To-To display

(7)

Repeat step 6 until a maximum of ten des-

depress key 1. Observe that TO-TO and selection mode

tinations are entered or if less than ten need to be en-

appears in the display. The display provides entry of

tered, asterisks are left for remaining destinations.

starting and ending destinations numbers.

(8)

To complete the entry of the random se-

(5)

To enter keyboard mode depress the KYBD

quence of waypoints depress ENT key.

key. (START field blinks.) To enter starting destination 62

(9)

Depress ENT key to select next page.

depress keys 6, 2.

(10) To select the start field and enter the starting

(6)

Depress KYBD key. (END field blinks.) To

destination depress KYBD key.

enter ending destination 45 depress keys 4, 5.

(11) To select the ending field and enter the end-

(7)

Depress KYBD key. (SELECT field blinks.)

ing destination depress KYBD key.

Enter Y (yes) for mode selection. N may be entered to

(12) Depress KYBD key. (SELECT field blinks.)

arm the system with the start and end destinations but

Enter Y (yes) for mode selection. N may be entered to

without entering the Route-Sequence To-To mode, or to

arm the system but without entering the ROUTE-Se-

exit the Route-Sequence To-To mode if the system is

quence Random mode, or to exit the ROUTE-Sequence

currently in that mode.

Random mode if the system is currently in that mode. An

NOTE

entry Y and R indicates a choice of Y-flying in forward

order, or R-flying in reverse order. To clear the random

If an entry is changed after Y is entered for

sequence, enter C for selection.

selection, and N must be entered for the

NOTE

selection then it may be changed to Y. The

sequence must be flown from the beginning

If an entry is changed after Y or R is entered

waypoint.

for selection, an N must be entered for the

selection then it may be changed to Y or R.

No target destinations or destinations with

The sequence must be flown from the begin-

target motion may be included as To-To way-

ning waypoint. No target destinations or des-

points.

tinations with target motion may be included

d. Procedure to Enter Route-Sequence Random

as Route Sequence Random waypoints.

Mode.

(13) After all entries are made, depress ENT

key.

The Doppler/GPS navigation set has the capability to

navigate through a sequence of randomly number des-

e. Procedure to Enter Route-Sequence-Consecu-

tinations.

tive Mode

As an example, consider navigating through destination

The Doppler/GPS navigation set has the capability to

numbers 32, 25, 74, 01, 48, 83, 35.

navigate through a sequence of consecutively numbered

destinations.

(1)

Set MODE switch to MGRS (LAT/LONG

As an example, consider navigating through destination

may also be used).

numbers 32 through 35.

(2)

Set DISPLAY switch to DATUM/ROUTE.

(1)

Set MODE switch to MGRS (LAT/LONG

may also be sued).

(3)

Depress the ENT key. Observe that a menu

of special steering functions appears.

(2)

Set DISPLAY switch to DATUM/ROUTE.

(4)

To select the Route-Sequence Random dis-

(3)

Depress the ENT key. Observe that a menu

play depress key 2. Observe that RT SEQ RANDOM now

of special steering functions appears.

appears in the display followed by the sequence of des-

(4)

To select the Route-Sequence-Consecutive

tination numbers and a continuation prompt.

display depress key 3. Observe that RT SEQ CONSEC

now appears in the display, followed by starting and end-

(5)

Enter the sequence of destination numbers

ing destination numbers, and mode selection.

by depressing the KYBD key to enter keyboard mode.

(First destination field is blinks.) To enter first destination

(5)

To enter keyboard depress the KYBD key.

32 depress 3, 2.

(START field blinks.) To enter starting destination 32 de-

press leys 3, 2.

(6)

Depress KYBD key. (Next destination field is

blinked.) Depress keys 2, 5 to enter second destination

(6)

Depress KYBD key. (END field blinks.) De-

25.

press keys 3, 5 to enter destination 35.

3-3-30

TM 1-1520-240-10

(7)

Depress KYBD key. (SELECT field blinks.)

h. Target Store (TGT STR) Operation

Enter Y (yes) for mode selection. N may be entered to

Two methods may be used for target store operation.

arm the system but without entering the Route-Se-

Method 1 is normally used when time is not available to

quence-Consecutive mode, or to exit the Route-Se-

preplan a target store operation. Method 2 is used when

quence-Consecutive mode if the system is currently in

time is available and it is desired to store a target in a

that mode. An entry of Y or R indicates a choice of Y-flying

specific location.

in the forward order, or R-flying in reverse order.

NOTE

Method 1 (uses location 90-99)

If an entry is changed after Y or R is entered

(1)

Depress the TGT STR key while flying over

for selection, and N must be entered for the

target.

selection then it may be changed to Y or R.

(2)

Present position and variation are automati-

The sequence must be flown from the begin-

cally stored in the target destination location which was

ning waypoint. No target destinations or des-

displayed in the target store field immediately prior to

tinations with target motion may be included

depressing the TGT STR key.

as Route Sequence Consecutive waypoints.

f. Procedure for Displaying Distance/Bearing/Time

Method 2 (uses locations 00-69 and 90-99)

Information.

1. Set MODE switch to MGRS or LAT/LONG

(1)

Set MODE switch to MGRS (LAT/LONG or

position, depending on coordinate from de-

GPS LDG may also be used).

sired.

(2)

Set DISPLAY switch to DIS/BRG/TIME.

2. Set display switch to WP/TGT position.

(3)

Observe that the distance-to-go in kilome-

3. To access P, depress the LTR LEFT key

ters (to the fly-destination), bearing, and time-to-go ap-

followed by the 6 key. Another way to ac-

pears on the bottom two lines of the display. (Distance is

cess P, is to display waypoint 99 then de-

in nautical miles when MODE switch position is LAT/

press the INC key or display waypoint 00

LONG.) Bearing-to-destination is displayed in hours,

then depress the DEC key.

minutes, and tenths of a minute.

4. Depress KYBD key when overflying poten-

(4)

The display of the second line depends on

tial target. Observe that display freezes and

the current steering mode as follows:

kybd is displayed in the bottom right corner

of the display indicating keyboard mode.

(a) Direct-To Steering (default): Fly-to des-

The destination number is now under key-

tination number and ICAO identifier are displayed. Ex-

board control indicated by a blinking field.

ample: 58:BANDO

(b) To-To Steering: TO-TO-:XX TO YY

CAUTION

where XX is the ’To-To’ start-of-leg destination number,

and YY is the ’To-To’ fly-to destination number.

Do not depress ENT key while destination

is set to P.

secutive and random): RT-RANDOM: XXTOYY where

5. If it desired to store the target enter the two

XX is current Route-Sequence fly-to destination number,

digit destination number and depress the

and YY is the next destination number in the sequence.

ENT key.

Approximately 10 seconds before overflying the fly-to

destination, the system automatically ’pickles’ to the next

6. If is not desired to store the target , set the

destination, and the new fly-to number blinks for 10 sec-

DISPLAY switch momentarily or perma-

onds then stops blinking.

nently to another position.

g. Procedure for Displaying Present Position and

i. Procedure for Entering Landing Mode

GPS Altitude

(1)

Set the Fly-to destination by setting the DIS-

(1)

Set the MODE switch to MGRS (LAT/LONG

PLAY switch to either XTK/TKE/KEY or DIST/BRG/

or GPS LDG may also be used). Set the DISPLAY switch

TIME. Directly enter the two digit destination number or

to PP and observe present position display.

use the INC or DEC keys.

(2)

To display present position variation and

(2)

Set MODE switch to GPS LDG.

GPS altitude depress the ENT key. Present position vari-

ation may be entered by depressing the KYBD key to

(3)

The DISPLAY switch continues to function

select the variation field. A variation is entered and the

as before. To switch between metric and English units,

ENT key is depressed.

depress the ENT key.

3-3-31

TM 1-1520-240-10

NOTE

In the event the CDU is initialized, the display will indicate

only EN when the CDU is operated. This is an indication

In this mode, the DGNS provides real-time

to the operator that previously stored data has been lost

landing guidance information to the HSI indi-

and that spheroid/variation, destinations, and calibration

cator. To display course deviation indication

data must be entered. Present position needs to be en-

(CDI) on VSI and HSI, depress then release

tered only if Doppler only mode has been selected. The

the DPLR GPS button on the HSI Mode Se-

KYBD key must be depressed to clear the EN.

lect Panel.

j. Procedure for Transferring Stored Destination/Tar-

The computer initializes to the following: operating mode

get Data From One Location to Another.

to combined, present position variation to E000.0, des-

tinations and associated variations to a non-entered

The following procedure allows the operator to transfer

state, wind speed (water motion) and sea current speed

stored destination/target data from one destination/tar-

000, DATUM:

00, present position to N45_

get location to another destination location. The trans-

00.00’E000_ 00.00’ (until updated by GPS), target store

ferred data consists of destination name/ICAO identifier,

location to 91, along track calibration correction to 00.0

location, variation, and landing information. For illustra-

percent, and magnetic compass deviation corrections to

tive purposes only, it is assumed that the operator wants

000.0 degrees. The following data must be entered:

to put the coordinates of stored target 97 into the location

for destination 12.

(1)

Depress KYBD key.

(1)

Set DISPLAY switch to WP/TGT position.

(2)

Set MODE switch to OFF momentarily, to

(2)

Depress keys 9 then 7.

LAMP TEST for approximately one second, and then to

MGRS or LAT/LONG.

(3)

Depress KYBD key, depress keys 1 then 2.

(3)

Select GPS or Y mode.

NOTE

(4)

Select DGNS operating mode if other than

Location name/ICAO identifier, variation, and

combined.

landing data may be deleted by first display-

ing the waypoint, depressing KYBD key, then

(5)

Enter datum.

the ENT key.

(6)

Enter present position if Doppler only has

(4)

Depress ENT key.

been selected.

k. Operation During and After a Power Interruption

(7)

Enter each destination and its associated

During a power interruption, the stored destination and

variation.

target data and present position are retained by non-vol-

l. Procedure for Display Aircraft heading, Pitch, and

atile RAM inside the CDU. This makes it unnecessary to

roll (Maintenance Function)

reenter any navigation data power returns. GPS satellite

data are also retained by a rechargeable battery inside

(1)

Set the CDU mode switch to test and ob-

the SDC. This makes it unnecessary to reload the crypto

serve the CDU test mode display.

key or wait for the collection of any almanac. Navigation

will be interrupted during the absence of power; however

(2)

After the Doppler test is completed depress

the present position will be updated when the GPS data

the ENT key.

becomes valid provided the DGNS mode has not been

selected as Doppler only. The pilot will have to re-enter

(3)

Observe the CDU display. The top indicates

the GPS operating mode (M or Y) using a single key (5

in degrees and tenths of a degree, aircraft system head-

or 9).

ing, pitch, and roll.

Table 3-3-4. Map Datum Codes.

Map Datum

Data Code

ADINDAN

ARC1950

AUSTRALIAN GEODETIC 1966

BUKIT RIMPAH

CAMP AREA ASTRO

DIAKARTA

EUROPEAN 1950

3-3-32

TM 1-1520-240-10

Table 3-3-4. Map Datum Codes - (Continued).

Map Datum

Data Code

SD, INDIAN SPECIAL

SD, LUZON SPECIAL

SD, TOKYO SPECIAL

SD, WGS-84 SPECIAL

WGS-72

WGS-84 (Default map datum)

3-3-53. GPS Data Loader Receptacle. (fig. 3-3-9)

(4)

If other selections are to be checked,

The GPS data loader receptacle allows the operator to

rotate Data Select switch to position desired. Then

load pre-programmed navigation information into the

compare data displayed with the known programmed

GPS receiver. This navigational information, such as way

data.

point position, DTM or almanac data is pre-loaded on a

(5)

Repeat steps (1) thru (5) as desired for any

data loader module, part number 164191-01-02 or

or all remaining way points.

164191-03-01, if Unit Operations and mission dictates.

(6)

GPS should now be ready for use during

flight operations.

3-3-54. Controls and Function - GPS Data Loader

Receptacle.

3-3-56. GPS KYK-13 Remote Fill Panel. (fig. 3-4-2)

Controls of the GPS Data Loader Receptacle are as

The GPS KYK-13 Remote Fill Panel allows encryption

follows:

data to be loaded from a KYK-13 or KOI-18 fill devise.

Reference will only be made to the KYK-13.

CONTROLS/

FUNCTION

3-3-57. Controls and Function - GPS KYK-13 Re-

INDICATOR

mote Fill Panel. (fig. 3-4-2)

RELEASE

When Pressed, releases

Controls of the GPS KYK-13 Remote Fill Panel are as

Pushbutton

Data Loader Module from

follows:

Data Loader Receptacle.

CONTROLS/

FUNCTION

3-3-55. Normal Operation - GPS Data Loader Recep-

INDICATOR

tacle.

LOADS

Provides positive indication that

Perform the following steps in sequence to operate the

STATUS

GPS receiver has successfully

data loader system:

LED

received crypto key fill.

a. Turn on the GPS System. Allow system to warm up

INIT

When pressed, causes the

and time in for approximately one minute.

LOAD

transfer of crypto key from fill

switch

devise (KYK-13 or KOI-18) to

NOTE

GPS receivers

Loading data loader must be done in INIT

Mode.

3-3-58. Normal Operation - GPS KYK-13 Remote Fill

b. Insert data loader module into data loader recep-

Panel.

tacle. Wait at least 30 seconds before switching to anoth-

To load keys from KYK-13 into the GPS receiver:

er mode. Display momentarily flashes when information

NOTE

has been successfully transferred.

The GPS receiver does not need to be on to

c. Locate module release button on left side of data

load keys with the KYK-13 Fill Devise.

loader receptacle. Release and remove data loader

a. Connect KYK-13, either directly or using a fill

module from data loader receptacle.

cable, to KYK/GPS FILL J1 receptacle located on the

Remote Fill Panel (Figure 3-4-2).

d. Verify operation of data loader system by:

b. Turn KYK-13 Fill switch to desired position.

(1)

Turn GPS Data Select switch to POS.

c. Turn KYK-13 Mode switch to ON.

(2)

Select a way point that is known to be pre-

d. Press LOAD INIT switch on the Remote Fill Panel

programmed.

(Figure 3-4-2). Wait approximately 5 seconds. If key was

(3)

Compare data displayed with known pro-

successfully loaded, Load Indicator light on the Remote

grammed data.

Fill Panel will flash.

3-3-34

TM 1-1520-240-10

e. Repeat steps b. thru d. to load additional keys.

(3)

If ZEROIZED message is displayed on

STAT Page 1, Line 2, the GPS receiver is declassified.

f. Turn KYK-13 Mode switch to OFF.

(4)

If ZERO FAIL message is displayed, zer-

g. Disconnect KYK-13 from aircraft receptacle.

oization was not successful and the GPS receiver re-

3-3-59. GPS Zeroize Switch. (fig. 2-1-8)

mains classified.

The GPS Zeroize switch is located on center instrument

panel, right side of AN/APR-39AV(1) Indicator, and is

used to erase any crypto data and all navigational infor-

mation stored in the GPS Receiver.

This zeroize switch consists of a guarded toggle switch.

3-3-60. Normal Operation GPS Zeroize Switch.

NOTE

Aircraft battery must be connected, or power

applied to aircraft.

a. Lift protective guard from zeroize toggle switch

and activate switch.

b. If GPS receiver is on, turn Data Switch to Stat.

Observe message on Page 1, Line 2.

The message ZEROED indicates a successful attempt

to erase information stored in the GPS receiver.

The message ZERO FAIL indicates an unsuccessful at-

tempt to erase the information. The GPS receiver re-

mains classified.

c. An alternate method to zeroize the GPS receiver

is to use the C-11702/UR and GPS Control Unit keyboard

as follows:

(1)

Select STAT page 1.

(2)

Enter ZZ on line 4, and push Line Select Key

Figure 3-3-9. Remote GPS Data Loader

Receptacle/KYK-13 Fill Panel

3-3-35/(3-3-36 blank)

OPERATOR’S MANUAL FOR ARMY CH-47D HELICOPTER (EIC: RCD, 2003) - page 4