JEPPESEN GENERAL AIRWAY MANUAL (Issue Date 1 JUL 21)

Crossing constraints (CSTU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

CSTU-14 Instruction that

the specified po-
sition is to be
crossed at the
level within the
vertical range as
specified, and at
the specified
speed.

CROSS (posi-
tion) AT (level)
AT (speed)

W/U

UM61 CROSS
(position) AT AND
MAINTAIN (alti-
tude) AT (speed)
NOTE 1: A vertical
range cannot be
provided.
NOTE 2: This
message element
is equivalent to
CSTU-14 plus
LVLU-5 in Doc
4444.

UM61 CROSS (po-
sition) AT AND
MAINTAIN (level)
AT (speed)

CSTU-15 Instruction that

the specified po-
sition is to be
crossed at the
specified time at
the level or with-
in the vertical
range, as speci-
fied, and at the
specified speed.

CROSS (posi-
tion) AT TIME
(time) AT (level)
AT (speed)

W/U

UM63 AT (time)
CROSS (position)
AT AND MAIN-
TAIN (altitude) AT
(speed)
NOTE 1: A vertical
range cannot be
level or within the
vertical provided.
NOTE 2: This
message element
is equivalent to
CSTU-15 plus
LVLU-5 in Doc
4444.

N/A

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1441

DATA LINK OPERATIONS

Speed message elements

Speed uplink message elements (SPDU)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

SPDU-1

Notification that
a speed instruc-
tion may be is-
sued to take ef-
fect at the speci-
fied time.

EXPECT
SPEED
CHANGE AT
TIME (time)

UM100 AT (time)
EXPECT (speed)

N/A

SPDU-2

Notification that
a speed instruc-
tion may be is-
sued to take ef-
fect at the speci-
fied position.

EXPECT
SPEED
CHANGE AT
(position)

UM101 AT (posi-
tion) EXPECT
(speed)

N/A

SPDU-3

Notification that
a speed instruc-
tion may be is-
sued to take ef-
fect at the speci-
fied level.

EXPECT
SPEED
CHANGE AT
(level single)

UM102 AT (alti-
tude) EXPECT
(speed)

N/A

SPDU-4

Instruction to
maintain the
specified speed

MAlNTAIN
(speed)

W/U

UM106 MAINTAIN
(speed)

SPDU-5

Instruction to
maintain the
present speed.

MAINTAIN
PRESENT
SPEED

W/U

UM107 MAINTAIN
PRESENT SPEED

SPDU-6

Instruction to
maintain the
specified speed
or greater.

MAINTAIN
(speed) OR
GREATER

W/U

UM108 MAINTAIN
(speed) OR
GREATER

SPDU-7

Instruction to
maintain the
specified speed
or less.

MAINTAIN
(speed) OR
LESS

W/U

UM109 MAINTAIN
(speed) OR LESS

A.4.5

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1442

DATA LINK OPERATIONS

Speed uplink message elements (SPDU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

SPDU-8

Instruction to
maintain the
specified speed
range.

MAINTAIN
(speed) TO
(speed)

W/U

UM110 MAINTAIN
(speed) TO
(speed)

N/A

SPDU-9

Instruction that
the present
speed is to be in-
creased to the
specified speed
and maintained
until further ad-
vised.

INCREASE
SPEED TO
(speed)

W/U

UM111 INCREASE
SPEED TO
(speed)

N/A

SPDU-10 Instruction that

the present
speed is to be in-
creased to the
specified speed
or greater, and
maintained at or
above the speci-
fied speed until
further advised.

INCREASE
SPEED TO
(speed) OR
GREATER

W/U

UM112 INCREASE
SPEED TO
(speed) OR
GREATER

N/A

SPDU-11 Instruction that

the present
speed is to be
reduced to the
specified speed
and maintained
until further ad-
vised.

REDUCE
SPEED TO
(speed)

W/U

UM113 REDUCE
SPEED TO
(speed)

N/A

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1443

DATA LINK OPERATIONS

Speed uplink message elements (SPDU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

SPDU-12 Instruction that

the present
speed is to be
reduced to the
specified speed
or less, and
maintained at or
below the speci-
fied speed until
further advised.

REDUCE
SPEED TO
(speed) OR
LESS

W/U

UM114 REDUCE
SPEED TO
(speed) OR LESS

N/A

SPDU-13 Instruction to re-

sume a normal
speed. The air-
craft no longer
needs to comply
with a previously
issued speed re-
striction.

RESUME NOR-
MAL SPEED

W/U

UM116 RESUME
NORMAL SPEED

SPDU-14 Indication that

the preferred
speed may be
flown without re-
striction.

NO SPEED RE-
STRICTION

UM169 ‘NO
SPEED RESTRIC-
TION’

UM222 NO SPEED
RESTRICTION

SPDU-15 Request to re-

port the speed
defined by the
speed type(s).

REPORT
(speed types)
SPEED

UM134 CONFIRM
SPEED
NOTE: NE re-
sponse attribute.

N/A

UM169 ‘REPORT
GROUND SPEED’
NOTE 1: Used
when the controller
is requesting the
flight crew to report
the present ground
speed.
NOTE 2: R re-
sponse attribute.

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1444

DATA LINK OPERATIONS

Speed uplink message elements (SPDU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

SPDU-16 Request to con-

firm the assigned
speed.

CONFIRM AS-
SIGNED
SPEED

UM136 CONFIRM
ASSIGNED
SPEED
NOTE: NE re-
sponse attribute.

N/A

SPDU-17 Request for the

earliest time or
position when
the specified
speed can be
accepted.

WHEN CAN
YOU ACCEPT
(speed)

UM151 WHEN
CAN YOU AC-
CEPT (speed)
NOTE: NE re-
sponse attribute.

N/A

Speed downlink message elements (SPDD)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

SPDD-1

Request for the
specified speed.

REQUEST
(speed)

DM18 REQUEST
(speed)

SPDD-2

Request for the
earliest time or
position that the
specified speed
can be expected.

WHEN CAN WE
EXPECT
(speed)

DM49 WHEN CAN
WE EXPECT
(speed)

N/A

SPDD-3

Report indicating
the speed de-
fined by the
specified speed
types is the
specified speed.

(speed types)
SPEED (speed)

DM34 PRESENT
SPEED (speed)

N/A

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1445

DATA LINK OPERATIONS

Speed downlink message elements (SPDD) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

DM67 ‘GROUND
SPEED (speed)’
NOTE 1: Used
when the controller
is requesting the
flight crew to report
the present ground
speed.
NOTE 2: When
pre-formatting of
the downlink mes-
sage is not availa-
ble, the flight crew
can shorten to: GS
(speed).

SPDD-4

Confirmation that
the assigned
speed is the
specified speed.

ASSIGNED
SPEED (speed)

DM39 ASSIGNED
SPEED (speed)

N/A

SPDD-5

Indication that
the specified
speed can be
accepted at the
specified time.

WE CAN AC-
CEPT (speed)
AT TIME (time)

DM67 ‘WE AN AC-
CEPT (speed) AT
TIME (time)’

N/A

SPDD-6

Indication that
the specified
speed cannot be
accepted.

WE CANNOT
ACCEPT
(speed)

DM67 ‘WE CAN-
NOT ACCEPT
(speed)’

N/A

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1446

DATA LINK OPERATIONS

Air traffic advisory message elements

Air traffic advisory uplink message elements (ADVU)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

ADVU-1

Advisory provid-
ing the specified
altimeter setting
for the specified
facility.

(facility designa-
tion) ALTIME-
TER (altimeter
setting)

UM153 ALTIME-
TER (altimeter)
NOTE: The facility
designation and
the time of meas-
urement cannot be
provided.

UM213 (facility
designation)
ALTIMETER (altim-
eter)
NOTE: The facility
designation is al-
ways provided and
the time of meas-
urement cannot be
provided.

UM169 ‘(facility
designation)
ALTIMETER
(altimeter setting)’

ADVU-2

Advisory that the
ATS surveillance
service is termi-
nated.

SURVEIL-
LANCE SERV-
ICE TERMINA-
TED

UM154 RADAR
SERVICES TER-
MINATED

N/A

UM169 ‘SURVEIL-
LANCE SERVICE
TERMINATED’
NOTE: ATS advi-
sory that the radar
and/or ADS-B
service is termina-
ted.

ADVU-3

Advisory that
ATS surveillance
service has been
established. A
position may be
specified posi-
tion.

IDENTIFIED
(position[O])

UM155 RADAR
CONTACT (posi-
tion)
NOTE: The provi-
sion of the position
is required.

N/A

A.4.6

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1447

DATA LINK OPERATIONS

Air traffic advisory uplink message elements (ADVU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

ADVU-4

Advisory that
ATS surveillance
contact has been
lost.

IDENTIFICA-
TION LOST

UM156 RADAR
CONTACT LOST

N/A

ADVU-5

ATS advisory
that the current
ATIS code is as
specified.

ATIS (ATIS
code)

UM158 ATIS (atis
code)
NOTE: The airport
is not provided.

N/A

ADVU-6

Advisory to re-
quest again with
next ATC unit.

REQUEST
AGAIN WITH
NEXT ATC
UNIT

UM169 ‘REQUEST
AGAIN WITH
NEXT ATC UNIT’
NOTE: R response
attribute.

UM237 REQUEST
AGAIN WITH
NEXT ATC UNIT

ADVU-7

Advisory of traf-
fic significant to
the flight.

TRAFFIC IS
(traffic descrip-
tion)

UM169 ‘TRAFFIC
IS (traffic descrip-
tion)’
NOTE: R response
attribute.

N/A

ADVU-8

Instruction to re-
port that the
specified traffic
has been visual-
ly sighted and
passed. The in-
struction may in-
dicate the esti-
mated time of
passing.

REPORT
SIGHTING AND
PASSING OP-
POSITE DIREC-
TION (aircraft
type[O]) (traffic
location) (ETP
time[O])

W/U

UM169 ‘REPORT
SIGHTING AND
PASSING OPPO-
SITE DIRECTION
(traffic description)
(ETP (time))’
NOTE: ETP Time
is included when
available.

N/A

ADVU-9

Instruction to se-
lect the specified
SSR code.

SQUAWK (SSR
code)

W/U

UM123 SQUAWK
(beacon code)

UM123 SQUAWK
(code)

ADVU-10 Instruction to dis-

able SSR trans-
ponder respon-
ses.

STOP
SQUAWK

W/U

UM124 STOP
SQUAWK

N/A

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1448

DATA LINK OPERATIONS

Air traffic advisory uplink message elements (ADVU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

ADVU-11 Instruction to

stop ADS-B
transmissions.

STOP ADS-B
TRANSMIS-
SION

W/U

UM169 ‘STOP
ADS-B TRANS-
MISSION’
NOTE: R response
attribute.

N/A

ADVU-12 Instruction to in-

clude level infor-
mation in the
SSR transpond-
er responses.

SQUAWK
MODE C

W/U

UM125 SQUAWK
ALTITUDE

N/A

ADVU-13 Instruction to

stop including
level information
in the SSR trans-
ponder respon-
ses.

STOP
SQUAWK
MODE C

W/U

UM126 STOP AL-
TITUDE SQUAWK

N/A

ADVU-14 Request to con-

firm the selected
SSR code.

CONFIRM
SQUAWK
CODE

UM144 CONFIRM
SQUAWK
NOTE: NE re-
sponse attribute.

N/A

ADVU-15 Instruction that

the ‘ident’ func-
tion on the SSR
transponder is to
be actuated.

SQUAWK
IDENT

W/U

UM179 SQUAWK
IDENT

ADVU-16 Instruction to ac-

tivate the ADS-C
capability.

ACTIVATE
ADS-C

W/U

UM169 ‘ACTIVATE
ADS C’
NOTE: R response
attribute.

N/A

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1449

DATA LINK OPERATIONS

Air traffic advisory uplink message elements (ADVU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

ADVU-17 Instruction to

transmit voice
position reports,
as specified, due
to ADS-C being
out of service.

ADS-C OUT OF
SERVICE RE-
VERT TO
VOICE POSI-
TION RE-
PORTS

W/U

UM169 ‘ADS-C
OUT OF SERVICE
REVERT TO
CPDLC POSITION
REPORTS’
UM169 ‘ADS-C
OUT OF SERVICE
REVERT TO
VOICE POSITION
REPORTS’
NOTE: R response
attribute.

N/A

ADVU-18 Instruction to in-

termediary air-
craft to relay the
specified mes-
sage to the
specified aircraft
on the specified
frequency, when
provided.

RELAY TO (air-
craft identifica-
tion) (unit name)
(relay text) (fre-
quency[O])

W/U

UM169 ‘RELAY
TO (call sign) (unit
name) (text of
message to be re-
layed) ((frequen-
cy))’
NOTE 1: R re-
sponse attribute.
NOTE 2: Frequen-
cy is included
when available.

N/A

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1450

DATA LINK OPERATIONS

Air traffic advisory uplink message elements (ADVU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

ADVU-19 Request to

check the aircraft
lateral position,
level or speed,
due to the ATC
unit detecting a
deviation from
the clearance.

(deviation type)
DEVIATION DE-
TECTED. VERI-
FY AND AD-
VISE

W/U

UM169 ‘LATERAL
POSITION DEVIA-
TION DETECTED.
VERIFY AND AD-
VISE’
UM169 ‘LEVEL
DEVIATION DE-
TECTED. VERIFY
AND ADVISE’
UM169 ‘SPEED
DEVIATION DE-
TECTED. VERIFY
AND ADVISE’
NOTE: R response
attribute.

N/A

ADVU-20 Notification that

the CPDLC
transfer is ex-
pected at the
specified time.

EXPECT
CPDLC TRANS-
FER AT TIME
(time)

UM 169 ‘EXPECT
CPDLC TRANS-
FER AT TIME
(time)’
NOTE: R response
attribute.

N/A

ADVU-21 Notification that

the first specified
ATS unit will not
establish CPDLC
and the NDA is
expected to be
the second
specified ATS
unit.

CPDLC WITH
(unit name)
NOT RE-
QUIRED EX-
PECT NEXT
CPDLC FACILI-
TY (unit name)

UM 169 CPDLC
WITH (unit name)
NOT REQUIRED
EXPECT NEXT
CPDLC FACILITY
(unit name)
NOTE: R response
attribute.

N/A

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1451

DATA LINK OPERATIONS

Air Traffic Advisory Downlink message elements (ADVD)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

ADVD-1

Report indicating
that the aircraft
is squawking the
specified SSR
code.

SQUAWKING
(SSR code)

DM47 SQUAWK-
ING (code)

N/A

ADVD-2

Report indicating
that whether or
not traffic has
been visually
sighted and if so,
if it has been
passed. May
provide a de-
scription and/or
location of the
aircraft.

TRAFFIC (air-
craft type[O])
(traffic location)
(traffic visibility)

DM67 ‘(traffic iden-
tification) SIGH-
TED AND
PASSED’
DM67 ‘(traffic iden-
tification) NOT
SIGHTED’
DM67 ‘TRAFFIC
SIGHTED’

N/A

Voice communications message elements

Voice communications uplink message elements (COMU)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

COMU-1 Instruction to es-

tablish voice
contact with the
specified ATS
unit on the speci-
fied frequency.

CONTACT (unit
name) (frequen-
cy)

W/U

UM117 CONTACT
(lCAO unit name)
(frequency)

UM117 CONTACT
(unit name) (fre-
quency)

A.4.7

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1452

DATA LINK OPERATIONS

Voice communications uplink message elements (COMU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

COMU-2 Instruction at the

specified posi-
tion to establish
voice contact
with the speci-
fied ATS unit on
the specified fre-
quency.

AT (position)
CONTACT (unit
name) (frequen-
cy)

W/U

UM118 AT (posi-
tion) CONTACT
(ICAO unit name)
(frequency)

N/A

COMU-3 Instruction at the

specified time to
establish voice
contact with the
specified ATS
unit on the speci-
fied frequency.

AT TIME (time)
CONTACT (unit
name) (frequen-
cy)

W/U

UM119 AT (time)
CONTACT (lCAO
unit name) (fre-
quency)

N/A

COMU-4 Advisory of the

secondary fre-
quency.

SECONDARY
FREQUENCY
(frequency)

UM169 ‘SECON-
DARY FREQUEN-
CY (frequency)’

N/A

COMU-5 Instruction to

monitor the
specified ATS
unit on the speci-
fied frequency.
The flight crew is
not required to
establish voice
contact on the
frequency.

MONITOR (unit
name) (frequen-
cy)

W/U

UM120 MONITOR
(ICAO unit name)
(frequency)

UM120 MONITOR
(unit name) (fre-
quency)

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1453

DATA LINK OPERATIONS

Voice communications uplink message elements (COMU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

COMU-6 Instruction at the

specified posi-
tion to monitor
the specified
ATS unit on the
specified fre-
quency. The
flight crew is not
required to es-
tablish voice
contact on the
frequency.

AT (position)
MONITOR (unit
name) (frequen-
cy)

W/U

UM121 AT (posi-
tion) MONITOR
(lCAO unit name)
(frequency)

N/A

COMU-7 Instruction at the

specified time to
monitor the
specified ATS
unit on the speci-
fied frequency.
The flight crew is
not required to
establish voice
contact on the
frequency.

AT TIME (time)
MONITOR (unit
name) (frequen-
cy)

W/U

UM122 AT (time)
MONITOR (ICAO
unit name) (fre-
quency)

N/A

COMU-8 Instruction to

check the micro-
phone due to de-
tection of a con-
tinuous transmis-
sion on the
specified fre-
quency.

CHECK STUCK
MICROPHONE
(frequency)

UM157 CHECK
STUCK MICRO-
PHONE (frequen-
cy)
NOTE: R response
attribute.

UM157 CHECK
STUCK MICRO-
PHONE (frequen-
cy)

COMU-9 Advisory of the

name of the cur-
rent ATC unit.

CURRENT ATC
UNIT (unit
name)

N/A

UM183 ‘CURRENT
ATC UNIT (unit
name)’

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1454

DATA LINK OPERATIONS

Voice communications downlink message elements (COMD)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

COMD-1 Request for

voice contact on
the specified fre-
quency.

REQUEST
VOICE CON-
TACT (frequen-
cy)

DM20 REQUEST
VOICE CONTACT
NOTE: Used when
a frequency is not
required.

N/A

DM21 REQUEST
VOICE CONTACT
(frequency)
NOTE: Used when
a frequency is re-
quired.

COMD-2 Notification from

the intermediary
aircraft of the
specified re-
sponse from the
specified aircraft.

RELAY FROM
(aircraft identifi-
cation) (relayed
text response)

DM67 ‘RELAY
FROM (call sign)
(response parame-
ters)’

N/A

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1455

DATA LINK OPERATIONS

Spacing message elements

Spacing Uplink message elements (SPCU)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

SPCU-1

ATS acknowl-
edgement for the
pilot use of the
in-trail procedure
when the ITP air-
craft is behind
the reference air-
craft. This mes-
sage element is
always con-
catenated with a
vertical clear-
ance.

ITP BEHIND
(aircraft identifi-
cation)

UM169 ‘ITP BE-
HIND (aircraft iden-
tification)’
NOTE: R response
attribute.

N/A

SPCU-2

ATS acknowl-
edgement for the
pilot use of the
in-trail procedure
when the ITP air-
craft is ahead of
the reference air-
craft. This mes-
sage element is
always con-
catenated with a
vertical clear-
ance.

ITP AHEAD OF
(aircraft identifi-
cation)

UM169 ‘ITP
AHEAD OF (air-
craft identification)’
NOTE: R response
attribute.

N/A

A.4.8

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1456

DATA LINK OPERATIONS

Spacing Uplink message elements (SPCU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

SPCU-3

ATS acknowl-
edgement for the
pilot use of the
in-trail procedure
when the ITP air-
craft is behind
both reference
aircraft. This
message ele-
ment is always
concatenated
with a vertical
clearance.

ITP BEHIND
(aircraft identifi-
cation) AND BE-
HIND (aircraft
identification)

UM169 ‘ITP BE-
HIND (aircraft iden-
tification) AND BE-
HIND (aircraft iden-
tification)’
NOTE: R response
attribute.

N/A

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1457

DATA LINK OPERATIONS

Spacing Uplink message elements (SPCU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

SPCU-4

ATS acknowl-
edgement for the
pilot use of the
in-trail procedure
when the ITP air-
craft is ahead of
both reference
aircraft. This
message ele-
ment is always
concatenated
with a vertical
clearance.

ITP AHEAD OF
(aircraft identifi-
cation) AND
AHEAD OF (air-
craft identifica-
tion)

UM169 ‘ITP
AHEAD OF (air-
craft identification)
AND AHEAD OF
(aircraft identifica-
tion)’
NOTE: R response
attribute.

N/A

SPCU-5

ATS acknowl-
edgement for the
pilot use of the
in-trail procedure
when the ITP air-
craft is behind
one reference
aircraft and
ahead of one ref-
erence aircraft.
This message el-
ement is always
concatenated
with a vertical
clearance.

ITP BEHIND
(aircraft identifi-
cation) AND
AHEAD OF (air-
craft identifica-
tion)’

UM169 ‘ITP BE-
HIND (aircraft iden-
tification) AND
AHEAD OF (air-
craft identification)’
NOTE: R response
attribute.

N/A

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1458

DATA LINK OPERATIONS

Spacing downlink message elements (SPCD)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

SPCD-1

Advisory indicat-
ing that the pilot
has the ITP
equipment, and
provides the
specified dis-
tance to the ref-
erence aircraft,
including aircraft
identification.
This message el-
ement is always
concatenated
with a vertical re-
quest.

ITP (specified
distance) BE-
HIND (aircraft
identification)

DM67 ‘ITP (dis-
tance) BEHIND
(aircraft identifica-
tion)’

N/A

SPCD-2

ITP (specified
distance)
AHEAD OF (air-
craft identifica-
tion)’

DM67 ‘ITP (dis-
tance) AHEAD OF
(aircraft identifica-
tion)’

N/A

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1459

DATA LINK OPERATIONS

Spacing downlink message elements (SPCD) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

SPCD-3

Advisory indicat-
ing that the pilot
has the ITP
equipment, and
provides the
specified dis-
tance to both ref-
erence aircraft,
including aircraft
identification.
This message el-
ement is always
concatenated
with a vertical re-
quest.

ITP (specified
distance) BE-
HIND (aircraft
identification)
AND (specified
distance) BE-
HIND (aircraft
identification)’

DM67 ‘ITP (dis-
tance) BEHIND
(aircraft identifica-
tion) AND (dis-
tance) BEHIND
(aircraft identifica-
tion)’
NOTE: Used with a
vertical request, in-
dicating an ITP re-
quest when there
are two reference
aircraft, both be-
hind.

N/A

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1460

DATA LINK OPERATIONS

Spacing downlink message elements (SPCD) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

SPCD-4

ITP (specified
distance)
AHEAD OF (air-
craft identifica-
tion) AND
(specified dis-
tance) AHEAD
OF (aircraft
identification)’

DM67 ‘ITP (dis-
tance) AHEAD OF
(aircraft identifica-
tion) AND (dis-
tance) AHEAD OF
(aircraft identifica-
tion)’
NOTE: Used with a
vertical request, in-
dicating an ITP re-
quest when there
are two reference
aircraft, both
ahead.

N/A

SPCD-5

Advisory indicat-
ing that the pilot
has the ITP
equipment, and
provides the
specified dis-
tance to one ref-
erence aircraft
and the specified
distance from
another refer-
ence aircraft, in-
cluding aircraft
identification.
This message el-
ement is always
concatenated
with a vertical re-
quest.

ITP (specified
distance) BE-
HIND (aircraft
identification)
AND (specified
distance)
AHEAD OF (air-
craft identifica-
tion)

DM67 ‘ITP (dis-
tance) BEHIND
(aircraft identifica-
tion) AND (dis-
tance) AHEAD OF
(aircraft identifica-
tion)’
NOTE: Used with a
vertical request, in-
dicating an ITP re-
quest when there
are two reference
aircraft, one behind
and the other
ahead.

N/A

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1461

DATA LINK OPERATIONS

Emergency/urgency message elements

Emergency/urgency uplink message elements (EMGU)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

EMGU-1 Request to pro-

vide the fuel re-
maining (time)
and the number
of persons on
board.

REPORT EN-
DURANCE AND
PERSONS ON
BOARD

UM131 REPORT
REMAINING FUEL
AND SOULS ON
BOARD
NOTE: NE re-
sponse attribute.

N/A

EMGU-2 Instruction to im-

mediately com-
ply with the as-
sociated instruc-
tion to avoid im-
minent situation.

IMMEDIATELY

Used in combina-
tion with LVLU-6
and LVLU-9, which
is implemented in
FANS 1/A as:

– UM38 IMMEDI-

ATELY CLIMB
TO (altitude)

– UM39 IMMEDI-

ATELY DE-
SCEND TO (alti-
tude)

N/A

EMGU-3 Request to con-

firm an ADS-C
indicated emer-
gency.

CONFIRM ADS-
C EMERGENCY

A/N

UM169 ‘CONFIRM
ADS-C EMER-
GENCY’
NOTE: R response
attribute.

N/A

A.4.9

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1462

DATA LINK OPERATIONS

Emergency/urgency downlink message elements (EMGD)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

EMGD-1 Indication of an

urgent situation.

PAN PAN PAN

DM55 PAN PAN
PAN
NOTE: N response
attribute.

N/A

EMGD-2 Indication of an

emergency sit-
uation.

MAYDAY MAY-
DAY MAYDAY

DM56 MAYDAY
MAYDAY MAY-
DAY
NOTE: N response
attribute.

N/A

EMGD-3 Report indicating

fuel remaining
(time) and num-
ber of persons
on board.

(remaining fuel)
ENDURANCE
AND (persons
on board) PER-
SONS ON
BOARD

DM57 (remaining
fuel) OF FUEL RE-
MAINING AND (re-
maining souls)
SOULS ON
BOARD
NOTE: N response
attribute.

N/A

EMGD-4 Indication that

the emergency
situation is can-
celled.

CANCEL
EMERGENCY

DM58 CANCEL
EMERGENCY
NOTE: N response
attribute.

N/A

Standard response message elements

Standard response uplink message elements (RSPU)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

RSPU-1

Indication that
the message
cannot be com-
plied with.

UNABLE

UM0 UNABLE

A.4.10

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1463

DATA LINK OPERATIONS

Standard response uplink message elements (RSPU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

RSPU-2

Indication that
the message will
be responded to
shortly.

STANDBY

UM1 STANDBY

RSPU-3

Indication that a
long-term delay
in response can
be expected.

REQUEST DE-
FERRED

UM2 REQUEST
DEFERRED

N/A

RSPU-4

Indication that
the message is
received.

ROGER

UM3 ROGER

UM169 ‘ROGER
MAYDAY’
NOTE 1: R re-
sponse attribute.
NOTE 2: Used to
acknowledge
emergency down-
link reports.

UM169 ‘ROGER
PAN’
NOTE 1: R re-
sponse attribute.
NOTE 2: Used to
acknowledge ur-
gency downlink re-
ports.

RSPU-5

Indication that
ATC is respond-
ing positively to
the message.

AFFIRM

UM4 AFFIRM

RSPU-6

Indication that
ATC is respond-
ing negatively to
the message.

NEGATIVE

UM5 NEGATIVE

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1464

DATA LINK OPERATIONS

Standard response uplink message elements (RSPU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

RSPU-7

Indication that
the request has
been forwarded
to the next con-
trol unit.

REQUEST
FORWARDED

UM169 ‘REQUEST
FORWARDED’
NOTE: R response
attribute.

UM211 REQUEST
FORWARDED

RSPU-8

Request to con-
firm the refer-
enced request
since the initial
request was not
understood. The
request should
be clarified and
resubmitted.

CONFIRM RE-
QUEST

UM143 CONFIRM
REQUEST

N/A

Standard response downlink message elements (RSPD)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

RSPD-1

Indication that
the instruction is
understood and
will be complied
with.

WILCO

DM0 WILCO

RSPD-2

Indication that
the instruction
cannot be com-
plied with.

UNABLE

DM1 UNABLE

RSPD-3

Indication that
the message will
be responded to
shortly.

STANDBY

DM2 STANDBY

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1465

DATA LINK OPERATIONS

Standard response downlink message elements (RSPD) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

RSPD-4

Indication that
the message is
received.

ROGER

DM3 ROGER
NOTE: ROGER is
the only correct re-
sponse to an uplink
free text message.

DM3 ROGER

RSPD-5

Indication of a
positive re-
sponse to a
message.

AFFIRM

DM4 AFFIRM

RSPD-6

Indication of a
negative re-
sponse to a
message.

NEGATIVE

DM5 NEGATIVE

Supplemental message elements

Supplemental uplink message elements (SUPU)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

SUPU-1

Indication that
the associated
instruction is to
be executed
when the flight
crew is ready.

WHEN READY

UM164 WHEN
READY

N/A

SUPU-2

Indication that
the associated
message is is-
sued due to the
specified reason.

DUE TO (speci-
fied reason up-
link)

UM166 DUE TO
TRAFFIC

N/A

UM167 DUE TO
AIRSPACE RE-
STRICTION

A.4.11

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1466

DATA LINK OPERATIONS

Supplemental uplink message elements (SUPU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

SUPU-3

Instruction to ex-
ecute the associ-
ated instruction
at the aircraft's
best perform-
ance rate.

EXPEDITE

Used in combina-
tion with LVLU-6,
which is implemen-
ted in FANS 1/A
as: UM36 EXPE-
DITE CLIMB TO
(altitude).

N/A

SUPU-4

Indication that
the associated
instruction is ei-
ther a revision to
a previously is-
sued instruction
or is different
from the reques-
ted clearance.

REVISED (revi-
sion reason[O])

UM170 ‘REVISED
(revision rea-
son[O])’
NOTE: R response
attribute.

N/A

SUPU-5

Indication that
the associated
instruction is to
be executed at
the earliest point
when the flight
crew is able.

WHEN ABLE

N/A
NOTE: This mes-
sage element is
part of UM75.

N/A

Supplemental downlink message elements (SUPD)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

SUPD-1

Indication that
the associated
message is is-
sued due to
specified reason.

DUE TO (speci-
fied reason
downlink)

DM65 DUE TO
WEATHER

DM66 DUE TO
AIRCRAFT PER-
FORMANCE

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1467

DATA LINK OPERATIONS

Free text message elements

Free text uplink message elements (TXTU)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

TXTU-1

(free text)
NOTE: M alert
attribute.

UM169 (free text)

UM203 (free text)

TXTU-2

(free text)
NOTE: M alert
attribute.

UM169 (free text)
NOTE: R response
attribute.

UM183 (free text)

TXTU-3

(free text)
NOTE: N alert
attribute.

UM169 (free text)
NOTE: R response
attribute.

N/A

TXTU-4

(free text)
NOTE: M alert
attribute.

W/U

UM169 (free text)
NOTE: R response
attribute.

UM196 (free text)

TXTU-5

(free text)
NOTE: M alert
attribute.

A/N

UM169 (free text)
NOTE: R response
attribute.

UM205 (free text)

A.4.12

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1468

DATA LINK OPERATIONS

Free text downlink message elements (TXTD)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

TXTD-1

(free text)
NOTE: M alert
attribute.

DM68 (free text)
NOTE 1: Urgency
or Distress Air (M)
NOTE 2: Selecting
any of the emer-
gency message el-
ements will result
in this message el-
ement being ena-
bled for the flight
crew to include in
the emergency
message at their
discretion.

N/A

TXTD-2

(free text)
NOTE: M alert
attribute.

DM67 (free text)

DM98 (free text)

System management message elements

System management uplink message elements (SYSU)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

SYSU-1

System-gener-
ated notification
of an error.

ERROR (error
information)

UM159 ERROR
(error information)

A.4.13

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1469

DATA LINK OPERATIONS

System management uplink message elements (SYSU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

SYSU-2

System-gener-
ated notification
of the next data
authority or the
cancellation
thereof.

NEXT DATA
AUTHORITY
(designation[O])

UM160 NEXT DA-
TA AUTHORITY
(ICAO facility des-
ignation)
NOTE: The facility
designation is re-
quired.

UM160 NEXT DA-
TA AUTHORITY
(facility)
NOTE: Facility pa-
rameter can specify
a facility designa-
tion or no facility.

SYSU-3

System-gener-
ated notification
that received
message is not
supported.

MESSAGE NOT
SUPPORTED
BY THIS ATC
UNIT

UM169 ‘MES-
SAGE NOT SUP-
PORTED BY THIS
ATC UNIT’
NOTE: R response
attribute.

UM162 MESSAGE
NOT SUPPORTED
BY THIS ATC UNIT

SYSU-4

System-gener-
ated notification
that received is
acceptable for
display.

LOGICAL AC-
KNOWLEDGE-
MENT

N/A

UM227 LOGICAL
ACKNOWLEDGE-
MENT

SYSU-5

System-gener-
ated message
indicating that
requests for logi-
cal acknowl-
edgements are
not permitted.

USE OF LOGI-
CAL AC-
KNOWLEDGE-
MENT PRO-
HIBITED

N/A

UM233 USE OF
LOGICAL AC-
KNOWLEDGE-
MENT PROHIBI-
TED
NOTE: ATN B1
ground systems
may not use UM
(as par ETSI CS)
since the use of
LACK is required.

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1470

DATA LINK OPERATIONS

System management uplink message elements (SYSU) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

SYSU-6

Advisory provid-
ing the maximum
one-way uplink
message trans-
mission delay.

LATENCY TIME
VALUE (latency
value)

UM169 ‘SET MAX
UPLINK DELAY
VALUE TO (de-
layed message pa-
rameter) SEC’
NOTE 1: R re-
sponse attribute.
NOTE 2: On FANS
1/A aircraft, this
message requires
specific action from
the flight crew to
manually set the
latency value.

N/A

SYSU-7

Indication that
the received
message has a
latency greater
than the require-
ment.

MESSAGE RE-
CEIVED TOO
LATE, RESEND
MESSAGE OR
CONTACT BY
VOICE

N/A

UM159 ERROR
(error information)
+ UM183 ‘DOWN-
LINK DELAYED
USE - VOICE’
NOTE: The error
information is set to
the value (2).

System management downlink message elements (SYSD)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

Message
element
identifier

Message ele-
ment intended
use

Format for
message ele-
ment display

Resp. FANS 1/A

ATN B1

SYSD-1

System-gener-
ated notification
of an error.

ERROR (error
information)

DM62 ERROR (er-
ror information)

SYSD-2

System-gener-
ated notification
that the received
message is ac-
ceptable for dis-
play.

LOGICAL AC-
KNOWLEDGE-
MENT

N/A

DM100 LOGICAL
ACKNOWLEDGE-
MENT

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1471

DATA LINK OPERATIONS

System management downlink message elements (SYSD) (continued)

Operational definition in PANS-ATM (Doc 4444)

CPDLC message sets

SYSD-3

System-gener-
ated rejection of
any CPDLC
message sent
from a ground
facility that is not
the current data
authority.

NOT CURRENT
DATA AU-
THORITY

DM63 NOT CUR-
RENT DATA AU-
THORITY

SYSD-4

System-gener-
ated notification
that the ground
facility is now the
current data au-
thority.

CURRENT DA-
TA AUTHORITY

N/A

DM99 CURRENT
DATA AUTHORITY

SYSD-5

System-gener-
ated notification
that the ground
system is not
designated as
the next data au-
thority (NDA), in-
dicating the iden-
tity of the current
data authority
(CDA). Identity
of the NDA, if
any, is also re-
ported.

NOT AUTHOR-
IZED NEXT DA-
TA AUTHORITY
(facility designa-
tion) (facility
designation[O])

DM64 (ICAO facili-
ty designation)
NOTE: Use by
FANS 1/A aircraft
in B1 environ-
ments.

DM107 NOT AU-
THORIZED NEXT
DATA AUTHORITY
NOTE: CDA and
NDA cannot be
provided.

CONTROLLER PILOT DATA LINK COMMUNICATION

(CPDLC)

1472

DATA LINK OPERATIONS

JEPPESEN GENERAL AIRWAY MANUAL (Issue Date 1 JUL 21) - page 46