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BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-23.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
Rolls-Royce 250-C30
c. Then proceed with Rolls-Royce engine fuel system
Series Operation and
purging procedure.
Maintenance Manual,
14W2
4.
Ensure air is purged from fuel filter head and check for fuel
leaks during ground run.
STARTER GENERATOR
Chapter 71
1.
Remove starter generator. Examine mounting pad and
clamp for condition.
Chapter 96
2.
Examine commutator for wear. Replace starter generator if
not smooth and bright or if showing excessive wear.
3.
Inspect brushes for wear.
Chapter 71
4.
Examine cooling duct and retention clamp for condition
and security.
5.
Examine the splines on starter generator shaft and engine
gear shaft.
DRIVETRAIN
Chapter 63
1.
Examine freewheel assembly for condition leaks and
security.
Chapter 63
2.
Examine the freewheel unit chip detector for accumulated
Chapter 96
material. Perform operational check of freewheel unit chip
detector. (Refer to transmission chip detector caution system.)
Chapter 65
3.
Examine forward short shaft (steel) disc pack couplings for
condition and security.
4.
Examine forward short shaft (steel) splined adapters for
wear.
Chapter 12
5.
Lubricate forward short shaft (steel) splined adapters.
Chapter 65
6.
Torque check forward short shaft disc pack coupling
fasteners 150 to 180 inch-pounds (16.9 to 20.3 Nm).
8 APR 2011
Rev. 14
Page 61
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-23.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
Chapter 96
ELECTRICAL
1.
Examine all electrical components, wires, cables, and
connectors in the power plant area for chafing, general
condition, and security.
2.
Verify illumination of airframe fuel filter caution light by
depressing differential switch
“press to test” button on filter
head.
GROUND RUN
CAUTION
GROUND RUN OF HELICOPTER TO BE
ACCOMPLISHED BY QUALIFIED PERSONNEL
ONLY.
Chapter 12
1.
Make sure applicable servicing requirements have been
carried out.
2.
Check oil level of transmission, hydraulic tank, engine and
rail rotor gearbox prior to running helicopter.
3.
Make sure that helicopter is ready for ground run and that
surrounding area is clear.
BHT-206L4-FM-1
4.
Start the helicopter and conduct ground run at 100% NR for
a minimum of 2 minutes to check for leaks and ensure all
systems are operational and parameters are within Flight
Manual limitations.
Page 62
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-24.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
DATE: __________________W.O. _____________________
FACILITY: _________________________________________
HELICOPTER S/N: __________________________________
REGISTRY NO.: ____________________________________
TOTAL TIME:_______________________________________
SIGNATURE:_______________________________________
ZONE 5 — AFT TOP DECK
PLACARDS AND MARKINGS
Chapter 11
1.
Examine the placards, decals and markings. Ensure they
are readable, correctly applied and in agreement with the
applicable configuration of your helicopter.
AIRFRAME (AFT TOP DECK)
Chapter 71
1.
Remove and examine aft fairing and attachment fasteners
for condition and security.
2.
Examine fairing retainer for condition.
3.
Examine exterior of aft deck structure for condition.
OIL SYSTEM
Chapter 79
1.
Examine oil cooler area for evidence of oil leaks. Examine
oil cooler pan for cleanliness and make sure the drain is not
blocked.
2.
Examine all flexible and rigid fluid lines for condition and
security.
a. Pay particular attention for chafing damage and kinked
lines.
Page 63
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-24.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
3.
Examine oil cooler core for obstructions and cleanliness.
Chapter 65
4.
Examine oil cooler blower and housing for cleanliness,
condition and security.
Chapter 79
5.
Examine oil tank for leakage, condition and security. Check
oil for contamination.
6.
Examine oil tank supports for condition and security.
Chapter 71
7.
Examine the oil cooler seals bonded inside the aft fairing
for condition.
8.
Examine external scavenge oil filter system
(STC)
(if
installed) for condition and security.
DRIVETRAIN
Chapter 65
1.
Examine the blower impeller for condition.
BHT-ALL-SPM,
2.
Using dye penetrant methods, inspect oil cooler blower
Chapter 6
impeller 206-061-432-031 for cracks. Give particular attention to
the mounting flange where individual blades attach.
3.
Examine oil cooler blower impeller shaft for condition.
4.
Examine oil cooler blower hanger bearings and brackets
for grease leakage and evidence of overheating.
5.
Lubricate oil cooler blower hanger bearings.
Chapter 12
6.
Examine aft short shaft
(aluminium) for condition and
Chapter 65
security.
7.
Examine aft short shaft (aluminium) splined adapter for
wear.
Chapter 12
8.
Lubricate aft short shaft (aluminum) splined adapter.
Chapter 65
9.
Torque check disc pack coupling fasteners
50 to
70 inch-pounds (5.7 to 7.9 Nm).
Page 64
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-24.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
Chapter 96
ELECTRICAL
1.
Examine all electrical components, wires, cables, and
connectors in the area of the aft deck for chafing, and general
condition and security.
ZONE 6 — TAILBOOM
Chapter 11
PLACARDS AND MARKINGS
1.
Examine the placards, decals and markings. Ensure they
are readable, correctly applied and in agreement with the
applicable configuration of your helicopter.
TAILBOOM STRUCTURE
Chapter 53
1.
Remove and examine tail rotor driveshaft cover, and
fasteners for condition and security.
2.
Remove and examine tail rotor gearbox fairings for
condition.
3.
Examine anti-chafing adhesive tape (C-460) on tailboom
for condition. Replace worn or damaged tape as required.
NOTE
In the event that cracks are found, contact Bell
Helicopter Textron, Product Support Engineering.
4.
Examine entire tailboom for the following conditions:
a. Dents.
NOTE
Pay particular attention to the upper left side tailboom
quadrant.
b. Cracks.
c. Deformation.
Page 65
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-24.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
NOTE
Pay particular attention to the rivets attaching the tail
rotor gearbox support to the tailboom.
BHT-206-SRM
d. Loose rivets. Replace as required.
Chapter 53
e. Chafing.
f. Waviness.
5.
Examine drive shaft cover clips for condition and security.
Inspect all clip edges for integrity of sealant. Reseal as required.
6.
As applicable to tailbooms modified in accordance with
ASB 206L-99-115, inspect doubler around stabilizer of left side
for integrity of sealant. Reseal as required.
7.
Examine horizontal stabilizer for condition and security.
Verify security of all attachment bolts.
8.
Examine elevators for condition, security, and side play.
9.
Examine auxiliary finlets for condition and security.
10. Examine vertical fin assembly for condition and security.
11. Inspect the vertical fin attachment support for condition and
damage. Pay particular attention to the vertical fin attachment
points.
12. Examine for open tailboom drains on lower tailboom skin
and clear any obstructions.
13. Inspect antennas for damage and security.
Chapter 32
14. Examine tailskid for condition, security and signs of ground
contact.
TAIL ROTOR DRIVESHAFTS
Chapter 65
1.
Examine tail rotor driveshaft hanger bearings for excessive
grease leakage and evidence of overheating.
Page 66
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-24.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
Chapter 12
2.
Lubricate tail rotor driveshaft hanger bearings.
3.
Examine and lubricate the aft tail rotor driveshaft splined
adapter.
Chapter 65
4.
Examine segmented driveshafts and aft splined adapter for
condition and security. Check splined adapters for adequate
lubrication and freedom of movement.
5.
Torque check disc pack coupling fasteners
50 to
70 inch-pounds (5.7 to 7.9 Nm).
TAIL ROTOR GEARBOX
Chapter 53
1.
Examine tail rotor gearbox support for condition and
security. Pay particular attention for cracks at the gearbox
attachment holes.
Chapter 65
2.
Examine tail rotor gearbox for oil leaks, condition and
security.
3.
Examine gearbox oil for evidence of contamination.
4.
Examine tail rotor output shaft for condition.
5.
Torque check tail rotor gearbox retaining nuts
50 to
70 inch-pounds (5.6 to 7.9 Nm).
6.
Examine the tail rotor gearbox chip detector for
accumulated material.
Chapter 96
7.
Perform operational check of the tail rotor gearbox chip
detector.
Chapter 64
TAIL ROTOR PITCH CHANGE CONTROLS
1.
Examine the tail rotor pitch control mechanism for freedom
of travel throughout range and for condition and security.
2.
Examine the following tail rotor pitch change components:
a. Boot for condition, security, and evidence of grease or
oil leakage.
Page 67
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-24.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
b. Lower control mechanism rod for condition of bearings.
c. Pitch links and spherical bearings for condition and
security.
d. Crosshead for condition and security.
e. Knurled nut for condition and security and liner for
excessive play.
Chapter 96
ELECTRICAL
1.
Examine all visible electrical components, wires, cables,
and connectors in the area of the tailboom for chafing, and
general condition and security.
2.
Verify navigation lights and anti-collision light for operation,
condition, and security.
Chapter 97
3.
Examine antennas for condition and security.
GROUND RUN
CAUTION
GROUND RUN OF HELICOPTER TO BE
ACCOMPLISHED BY QUALIFIED PERSONNEL
ONLY.
Chapter 12
1.
Make sure applicable servicing requirements have been
carried out.
2.
Check oil level of transmission, hydraulic tank, engine and
rail rotor gearbox prior to running helicopter.
3.
Make sure that helicopter is ready for ground run and that
surrounding area is clear.
BHT-206L4-FM-1
4.
Start the helicopter and conduct ground run at 100% NR to
check for leaks and ensure all systems are operational and
parameters are within Flight Manual limitations.
Page 68
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-25.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 5
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
DATE: __________________W.O. _____________________
FACILITY: _________________________________________
HELICOPTER S/N: __________________________________
REGISTRY NO.: ____________________________________
TOTAL TIME:_______________________________________
SIGNATURE:_______________________________________
ZONE 7 — CABIN INTERIOR
Chapter 11
PLACARDS AND MARKINGS
1.
Examine the placards, decals and markings. Ensure they
are readable, correctly applied and in agreement with the
applicable configuration of your helicopter.
BHT-206L4-FM-1
INSTRUMENTS
1.
Examine instruments and instrument panel for condition,
security and for correct markings.
AIRFRAME
Chapter 25
1.
Remove cabin overhead upholstery, hat bin, soundproofing
blanket, aft vertical tunnel covers, and roll-over bulkhead access
panels.
Chapter 53
2.
Remove roof beam access panels.
Chapter 67
3.
Examine flight control tubes inside roof beam for condition
and security.
Chapter 53
4.
Examine roof beam and roof shell structure for condition.
5.
Examine aft passenger seat bulkhead for distortion and/or
cracks and indication of screw contact in the area of hat bin
attachment nutplates.
Page 69
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-25.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 5 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
Chapter 96
6.
Examine electrical components behind hat bin for
condition, security, and cleanliness.
Chapter 53
7.
Examine engine and transmission support structure for
cracks, corrosion, or loose fasteners.
CAUTION
EXERCISE CARE AND USE ADEQUATE SCREW
LENGTH WHEN REINSTALLING VERTICAL
TUNNEL COVER TO AVOID CONTACT WITH TAIL
ROTOR CONTROL TUBE.
8.
In the vertical tunnel area, examine the following:
Chapter 67
a. Flight control system tubes for evidence of chafing with
oil line or flex cable.
b. Flight control system bellcranks, levers, supports, and
walking beams for binding, excessive looseness, and security of
attachment.
Chapter 95
c. Oil lines for leakage, condition, and security.
Chapter 53
d. Roof beam interface with vertical tunnel for cracks,
corrosion, and loose fasteners.
e. Vertical tunnel stiffening angles at roof beam interface
for cracks, condition, and loose fasteners.
Chapter 25 and
9.
Remove crew seat cushions and panels and examine the
Chapter 53
following:
Chapter 67 and
a. Control tubes, N1 throttle cable, bellcranks, levers,
Chapter 76
yokes, and supports for bending, excessive looseness, and
security of attachment.
Applicable Service
b. Heater ducts (if installed) for chafing with controls.
Instruction
Chapter 95
c. Oil lines for leakage and general condition.
Page 70
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-25.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 5 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
Chapter 96
d. Wiring and electrical components for condition and
security.
Chapter 53
e. Structure for corrosion, cracks, and condition.
EQUIPMENT AND FURNISHINGS
Chapter 53
1.
Examine the cabin floor for condition.
Chapter 25
2.
Examine the seat assemblies for condition and security.
IL GEN-05-103
3.
Examine passenger and crew restraints and webbing for
condition and security.
4.
Verify operation of passenger and crew inertia reels and
belt buckles. Pull promptly on each reel to confirm the proper
activation of the reel locking mechanism.
5.
Examine the interior trim for condition and security.
Chapter 52
6.
Verify sliding windows for safety and smoothness of sliding.
Chapter 21
7.
Examine the ventilation system for condition and security.
8.
Verify nose vents for proper operation, absence of
obstructions or debris, and open drains.
Chapter 95
9.
Verify for proper operation of the fuel valve switch guard.
Chapter 26
10. Inspect cabin fire extinguisher for condition, security and
proper charge.
Chapter 21
11. Verify proper operation of ventilation inlet control cables.
12. Examine first aid kit, replace missing or out of date items.
Chapter 67
CONTROLS
1.
Examine the collective control stick for condition and
security and minimum friction. Examine copilot collective control
stick if installed.
Page 71
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-25.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 5 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
2.
Examine the cyclic control stick for condition and security
and minimum friction. Examine copilot cyclic control stick if
installed.
3.
Examine the anti-torque control pedals for condition and
security and minimum friction. Examine copilot anti-torque
control pedals if installed.
Chapter 96
ELECTRICAL
1.
Verify operation of cockpit map reading light.
2.
Verify operation of aft cabin reading lights (if installed).
CAUTION
USE EXTREME CARE WHEN IN PROXIMITY OF
PITOT TUBE WITH HEAT APPLIED, TOUCHING
TUBE MAY RESULT IN SERIOUS BURNS.
3.
Verify operation of the pitot tube heating system.
4.
Verify operation of defog blowers.
5.
Verify operation of ENGINE OUT and LOW ROTOR RPM
audio and mute switch (if installed).
6.
Verify illumination of all caution panel annunciator light
segments by depressing test switch, or each individual light
segment, as applicable.
7.
Verify instrument lighting and dimming capabilities.
ZONE 8 — FORWARD FUSELAGE
PLACARDS AND MARKINGS
Chapter 11
1.
Examine the placards, decals and markings. Ensure they
are readable, correctly applied and in agreement with the
applicable configuration of your helicopter.
Page 72
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-25.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 5 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
FUSELAGE
Chapter 53
1.
Examine forward fuselage for condition.
Chapter 52
2.
Examine all cabin doors for condition and security. Give
special attention to the following
a. Hinges
b. Seals
c. Latches for proper adjustment, positive locking, and
wear
d. Windows
e. Handles
Chapter 95
3.
Drain moisture from pitot and static piping installation.
Chapter 53
4.
Examine the external power door and receptacle for
condition and security.
5.
Examine battery compartment door, door seal and
attachment for condition and security.
Chapter 52
6.
Examine components in battery compartment for condition
and security.
Chapter 32
7.
Examine cabin entry steps (if installed) for condition and
security.
Chapter 52
8.
Examine windshields and skylights for condition.
Chapter 53
9.
Examine upper fuselage for evidence of water leaks.
10. Examine lower fuselage for indication of fuel leaks, dents,
cracks, corrosion, delamination, loose or missing rivets, and
condition.
11. Examine all fuselage sealant joints for condition. Restore
sealant as necessary.
Page 73
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-25.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 5 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
Chapter 96 and
ELECTRICAL AND AVIONICS
Chapter 97
1.
Examine all visible electrical components, wires, cables,
and connectors in the area of the forward fuselage for chafing,
and general condition and security.
2.
Remove battery and recondition in accordance with
BHT-ALL-SPM and manufacturer’s service manual.
3.
Examine battery vent tubes for obstruction or damage.
4.
Perform operational test of the battery temperature
indicating system.
5.
If battery was removed, clean mounting area prior to
installing serviceable battery.
6.
Verify operation of litter door open warning light.
7.
Verify operation of landing lights.
8.
Verify operation of lower fuselage mounted position lights
(if installed).
9.
Examine antennas for condition and security.
GROUND RUN
CAUTION
GROUND RUN OF HELICOPTER TO BE
ACCOMPLISHED BY QUALIFIED PERSONNEL
ONLY.
Chapter 12
1.
Make sure applicable servicing requirements have been
carried out.
2.
Check oil level of transmission, hydraulic tank, engine and
rail rotor gearbox prior to running helicopter.
Page 74
Rev. 20
7 NOV 2014
Export Classification C,
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-25.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 5 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
3.
Make sure that helicopter is ready for ground run and that
surrounding area is clear.
BHT-206L4-FM-1
4.
Start the helicopter and conduct ground run at 100% NR to
check for leaks and ensure all systems are operational and
parameters are within Flight Manual limitations.
Chapter 96
5.
Check the voltage regulator setting. Adjust as required.
Page 75/76
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-26.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 6
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
DATE: __________________W.O. _____________________
FACILITY: _________________________________________
HELICOPTER S/N: __________________________________
REGISTRY NO.: ____________________________________
TOTAL TIME:_______________________________________
SIGNATURE:_______________________________________
ZONE 9 — AFT FUSELAGE
PLACARDS AND MARKINGS
Chapter 11
1.
Examine the placards, decals and markings. Make sure
they are readable, correctly applied and in agreement with the
applicable configuration of your helicopter.
FUSELAGE (EXTERIOR)
Chapter 53
1.
Examine aft fuselage for dents, cracks, corrosion,
delamination, loose or missing rivets and condition.
2.
Examine aft fuselage for indications of fuel or oil leaks.
Chapter 28
3.
Examine the fuel cap for condition and security.
Chapter 96
4.
Examine the grounding plug for condition.
Chapter 6 and
5.
Examine all fuselage drains for condition and freedom from
Chapter 53
obstructions.
Applicable Service
6.
Examine heater and/or air conditioning inlets and outlets
Instruction
for cleanliness and absence of obstructions, (if installed).
Chapter 53
7.
Examine baggage compartment door, seal, and latches for
operation, condition, and security.
Page 77
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-26.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 6 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
Chapter 96
8.
Verify operation of the baggage door ajar caution light, (if
installed).
FUSELAGE (INTERIOR)
Chapter 53
1.
Examine baggage compartment for condition.
2.
Gain access to inside of aft fuselage through access
panels in baggage compartment and access panel located on
the aft right hand fuselage:
a. Examine access panels and fasteners for condition.
b. Examine under engine pan for fuel, oil or water leaks.
c. Examine drain lines for condition and security.
d. Examine interface between longerons and engine pan
structure for cracks, corrosion, distortion and loose fasteners.
e. Inspect engine mount attachment structure for
condition.
3.
Remove fuel shutoff valve access panel.
a. Examine structure for cracks and corrosion.
Chapter 28
b. Examine fuel system components for leaks and general
condition.
Chapter 96
c. Examine wires and connectors for condition.
CONTROLS
Chapter 67
1.
Examine the anti-torque control system components for
condition and security.
2.
Examine the stabilizer elevator control system components
for condition and security.
Page 78
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-26.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 6 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
Chapter 96 and
ELECTRICAL AND AVIONICS
Chapter 97
1.
Examine antennas for condition and security.
2.
Examine all components, electrical wiring, cables, and
connectors for chafing, general condition, and security.
3.
Examine all optional equipment installed in the aft fuselage
area for condition and security.
4.
Verify proper operation of fuel sump drain valve switch.
ZONE 10 — LANDING GEAR
Chapter 11
PLACARDS AND MARKINGS
1.
Examine the placards, decals and markings. Ensure they
are readable, correctly applied and in agreement with the
applicable configuration of your helicopter.
Chapter 32
CROSSTUBES
1.
Examine crosstube retaining straps, cushions, and
attaching hardware for condition and security.
2.
Examine fuselage attachment fittings for condition and
security.
3.
Examine electrical bonding strips (if installed) for condition
and security.
4.
Examine fairings (if installed) for condition and security.
5.
Examine crosstube riveted or clamped supports for
condition and security. Give particular attention to the sealant
joints around supports. Restore sealant (C-251) and paint finish
as required.
6.
Examine crosstubes for corrosion and damage. Give
particular attention to areas where equipment is mounted.
Repair and/or restore surface protection as required.
Page 79
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-26.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 6 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
7.
Examine cabin entry steps for condition and security (if
installed).
8.
Examine sealant joint at junction with skid tube saddles.
Restore sealant (C-251) and paint finish as required.
Chapter 32
SKID TUBES
1.
Examine skid tubes for corrosion, damage, and security.
2.
Examine skid shoes for condition and security.
3.
Examine skid tube saddles for corrosion, damage, and
security.
4.
Examine ground handling wheel attachment bolts for
condition and security.
GROUND RUN
CAUTION
GROUND RUN OF HELICOPTER TO BE
ACCOMPLISHED BY QUALIFIED PERSONNEL
ONLY.
Chapter 12
1.
Make sure applicable servicing requirements have been
carried out.
2.
Check oil level of transmission, hydraulic tank, engine and
rail rotor gearbox prior to running helicopter.
3.
Make sure that helicopter is ready for ground run and that
surrounding area is clear.
BHT-206L4-FM-1
4.
Start the helicopter and conduct ground run at 100% NR to
check for leaks and ensure all systems are operational and
parameters are within Flight Manual limitations.
Page 80
BHT-206L4-MM-1
PERIODIC INSPECTION
5-27.
300-HOUR AIRFRAME PERIODIC INSPECTION
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MUCH OTHER
DATE: __________________W.O. _____________________
FACILITY: _________________________________________
HELICOPTER S/N: __________________________________
REGISTRY NO.: ____________________________________
TOTAL TIME:_______________________________________
SIGNATURE:_______________________________________
1.
Do this inspection every 300 hours of operation or every
12 calendar months.
Chapter 5
2.
Do all six events of the 300-hour progressive inspection.
Paragraph 5-21
through paragraph
5-26
Page 81/82
BHT-206L4-MM-1
SCHEDULED INSPECTIONS
5-28.
100-HOUR INSPECTION
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
DATE: __________________W.O. _____________________
FACILITY: _________________________________________
HELICOPTER S/N: __________________________________
REGISTRY NO.: ____________________________________
TOTAL TIME:_______________________________________
SIGNATURE:_______________________________________
NOTE
100-hour inspection must be accomplished when
using the 300-hour airframe progressive inspection
program or the 300-hour airframe periodic inspection
program.
MAIN ROTOR
1.
Torque check pillow block retention hardware
84 to
107 inch-pounds (9.4 to 12 Nm). Examine for misalignment of
anti-slippage marks.
TAILBOOM
CAUTION
ANY CRACK, CORROSION, OR LOOSE OR
SHEARED RIVET IS CAUSE FOR IMMEDIATE
GROUNDING OF THE HELICOPTER UNTIL THE
PROBLEM IS CORRECTED.
Chapter 53
2.
Remove access panel on right side of aft fuselage.
Chapter 4
Export Classification C,
7 NOV 2014
Rev. 20
Page 83
BHT-206L4-MM-1
SCHEDULED INSPECTIONS
5-28.
100-HOUR INSPECTION (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
3.
Examine the four tailboom attachment fittings on fuselage
aft bulkhead and tailboom forward bulkhead for cracks. Give
special attention to the tailboom attachment fittings/intercostals
and bolts, and to fasteners between the intercostal. Particular
attention must be given to inspection of the upper left fitting
(refer to Chapter 4, Inspection Limitations Schedule).
4.
Make sure the area is clean and visually examine all visible
sections of the upper left longeron between aft fuselage frame
at STA 204.92 and frame at STA 231.486 for general condition,
corrosion, and cracks.
a. If corrosion or a defect is found, submit details to
Product Support Engineering for evaluation and possible repair.
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BHT-206L4-MM-1
SCHEDULED INSPECTIONS
5-29.
300-HOUR INSPECTION
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
DATE: __________________W.O. _____________________
FACILITY: _________________________________________
HELICOPTER S/N: __________________________________
REGISTRY NO.: ____________________________________
TOTAL TIME:_______________________________________
SIGNATURE:_______________________________________
NOTE
Every
300 hours of operation, the
300-hour
inspection must be accomplished in conjunction with
the
100-hour airframe progressive inspection
program or the 100-hour airframe periodic inspection
program.
MAIN ROTOR
PITCH LINK ASSEMBLY (206-010-360-005)
1.
Examine the condition of the torque seal (C-049) between
the main rotor pitch link tube and the upper and lower inserts of
both main rotor pitch link assemblies.
a. If the torque seal (C-049) is missing or damaged, carry
out a detailed visual inspection (DVI) of the main rotor pitch link
tube assembly for debonding of the insert where the torque seal
(C-049) is missing or damaged. This can include, but not limited
to, cracked paint, cracked sealant, and corrosion.
(1) Remove the torque seal (C-049) residue, and
clean inserts and tube with a clean cloth (C-516) moistened with
drycleaning solvent (C-304).
(2) If the insert is not debonded, again apply torque
seal (C-049), or equivalent.
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SCHEDULED INSPECTIONS
5-29.
300-HOUR INSPECTION (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
2.
If an insert is found debonded, or is suspected to be,
contact
Product
Support
Engineering
(PSE) at
productsupport@bellflight.com for disposition. Provide the
following information:
i.
The serial number of the helicopter the
suspect parts are found.
ii.
The part number of the main rotor pitch
link assembly.
iii.
The serial number of the main rotor pitch
link assembly.
iv. Total time since new of the main rotor
pitch link assembly (if known).
v. If it is the upper or lower insert (or both)
that is found, or suspected to be, debonded.
vi. Pictures of the debonded, or suspected
to be, insert(s).
FORWARD FUSELAGE
CABIN INTERIOR
Chapter 25
1.
Remove cabin overhead upholstery, hat bin, soundproofing
blanket, aft vertical tunnel covers, and roll-over bulkhead access
panels.
Chapter 53
2.
Remove roof beam access panels.
Chapter 67
3.
Examine flight control tubes inside roof beam for condition
and security.
Chapter 53
4.
Examine roof beam and roof shell structure for condition.
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31 AUG 2021
Export Classification C,
BHT-206L4-MM-1
SCHEDULED INSPECTIONS
5-29.
300-HOUR INSPECTION (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
5.
Examine aft passenger seat bulkhead for distortion and/or
cracks and indication of screw contact in the area of hat bin
attachment nutplates.
Chapter 96
6.
Examine electrical components behind hat bin for
condition, security, and cleanliness.
Chapter 53
7.
Examine engine and transmission support structure for
cracks, corrosion, or loose fasteners.
CAUTION
EXERCISE CARE AND USE ADEQUATE SCREW
LENGTH WHEN REINSTALLING VERTICAL
TUNNEL COVER TO AVOID CONTACT WITH TAIL
ROTOR CONTROL TUBE.
8.
In the vertical tunnel area, examine the following:
Chapter 67
a. Flight control system tubes for evidence of chafing with
oil line or flex cable.
b. Flight control system bellcranks, levers, supports, and
walking beams for binding, excessive looseness, and security of
attachment.
Chapter 95
c. Oil lines for leakage, condition, and security.
Chapter 53
d. Roof beam interface with vertical tunnel for cracks,
corrosion, and loose fasteners.
e. Vertical tunnel stiffening angles at roof beam interface
for cracks, condition, and loose fasteners.
Chapter 25 and
9.
Remove crew seat cushions and panels and examine the
Chapter 53
following:
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BHT-206L4-MM-1
SCHEDULED INSPECTIONS
5-29.
300-HOUR INSPECTION (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
Chapter 67 and
a. Control tubes, N1 throttle cable, bellcranks, levers,
Chapter 76
yokes, and supports for bending, excessive looseness, and
security of attachment.
Applicable Service
b. Heater ducts (if installed) for chafing with controls.
Instruction
Chapter 95
c. Oil lines for leakage and general condition.
Chapter 96
d. Wiring and electrical components for condition and
security.
Chapter 53
e. Structure for corrosion, cracks, and condition.
CONTROLS
Chapter 67
1.
Verify minimum friction of collective control and readjust as
required.
2.
Verify minimum friction of cyclic control and readjust as
required.
3.
Verify minimum friction of control pedals and readjust as
required.
Chapter 96
ELECTRICAL
1.
Remove battery and recondition in accordance with
BHT-ALL-SPM and manufacturer’s service manual.
FUSELAGE
Chapter 52
1.
Inspect latches on crew doors for correct adjustment.
2.
Inspect latches on passenger doors, and baggage door for
correct adjustment.
PYLON AREA
SWASHPLATE ASSEMBLY
Chapter 62
1.
Verify and adjust swashplate tilt friction as required.
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Export Classification C,
BHT-206L4-MM-1
SCHEDULED INSPECTIONS
5-29.
300-HOUR INSPECTION (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
2.
Value must be between 15 to 32 pounds (67 to 142 N). If
out of limits, adjust to 15 to 32 pounds (67 to 142 N) and check
again.
HYDRAULIC
Chapter 12
1.
Remove hydraulic pump and rotor tachometer generator.
Chapter 29
Chapter 63
2.
Examine hydraulic pump shaft splines and rotor
tachometer splines for excessive wear.
3.
Lubricate hydraulic pump shaft splines and rotor
tachometer splines.
TRANSMISSION ASSEMBLY
1.
Examine transmission oil pump splines for excessive wear.
POWER PLANT AREA
GENERAL
Rolls-Royce 250-C30
1.
Perform engine inspection per the applicable Rolls-Royce
Series Operation and
Operation and Maintenance Manual.
Maintenance Manual,
14W2
Chapter 95
2.
Perform operational check of turbine outlet temperature
system.
Chapter 95 and
3.
Examine N1 and N2 tachometer generator shaft splines
Chapter 12
and gearbox adapter splines for condition. Clean and lubricate
shaft splines.
Chapter 28
FUEL SYSTEM
1.
Inspect airframe fuel filter head as follows:
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5-29.
300-HOUR INSPECTION (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
NOTE
The following step does not apply to helicopters
equipped with fuel filter assembly 222-366-621-103.
a. Remove outlet port fitting from filter head.
b. Pass a 0.020 inch (0.50 mm) wire through the bleed
hole in outlet port side of filter head to ensure hole is not
obstructed.
2.
Replace airframe fuel filter element.
Chapter 28
3.
Purge airframe and engine fuel system as follows:
a. Turn both fuel boost pumps ON.
b. Depress airframe fuel filter bypass valve “press to test”
button on fuel filter head until there is no evidence of air coming
out of the lower fuel filter drain port and out of the fuel filter
outlet supply line.
Rolls-Royce 250-C30
c. Then proceed with Rolls-Royce engine fuel system
Series Operation and
purging procedure.
Maintenance Manual,
14W2
4.
Ensure air is purged from fuel filter head and check for fuel
leaks during ground run.
STARTER GENERATOR
Chapter 71
1.
Remove starter generator. Examine mounting pad and
clamp for condition.
Chapter 96
2.
Examine commutator for wear. Replace starter generator if
not smooth and bright or if showing excessive wear.
3.
Inspect brushes for wear.
Chapter 71
4.
Examine cooling duct and retention clamp for condition
and security.
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Rev. 25
31 AUG 2021
Export Classification C,
BHT-206L4-MM-1
SCHEDULED INSPECTIONS
5-29.
300-HOUR INSPECTION (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
5.
Examine the splines on starter generator shaft and engine
gear shaft.
AFT FUSELAGE/TAILBOOM AREA
AFT FUSELAGE
1.
Visually inspect longeron and engine pan interface for
corrosion as follows:
a. Open access door in overhead baggage compartment.
b. Open engine compartment cowling.
c. Using bright light and mirror, inspect exposed upper and
lower edges of the joints and fastener between aluminum
longeron and titanium engine pan. Edge of sealant coating
should be visible. No indications of corrosion are acceptable.
BHT-206-SRM-1
d. If there is no indication of corrosion and the bonded
surface seal is present, replace access panel and close engine
compartment cowling door. If corrosion is present or bonded
surface seal is not present, refer to the BHT-206-SRM-1 for
repair procedures.
e. Inspect engine mount attachment structures for cracks
and condition.
f. Remove fuel shutoff valve access panel. Inspect area
for corrosion, cracks, and fuel leaks. Check wiring and plumbing
for security and condition.
g. Inspect aft passenger rear bulkhead for indication of
screw contact or cracks in area of hat bin attachment anchor
nuts.
2.
Inspect aft passenger rear bulkhead for distortion in area of
hat bin attachment anchor nuts.
DRIVETRAIN
Chapter 65 and
1.
Examine forward short shaft (steel) splined adapters for
Chapter 12
excessive wear and lubricate.
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SCHEDULED INSPECTIONS
5-29.
300-HOUR INSPECTION (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
BHT-ALL-SPM,
2.
Using dye penetrant methods, inspect oil cooler blower
Chapter 6
impeller 206-061-432-031 for cracks. Give particular attention to
the mounting flange where individual blades attach.
TAIL ROTOR DRIVESHAFT
Chapter 65
1.
Lubricate oil cooler blower and tail rotor driveshaft hanger
bearings and check for evidence of overheating.
Chapter 12
2.
Examine and lubricate aft short shaft (aluminum) and aft
tail rotor driveshaft splined adapters.
Chapter 65
TAIL ROTOR GEARBOX
Torque check tail rotor gearbox retaining nuts 50 to
70 inch-pounds (5.6 to 7.9 Nm).
TAIL ROTOR HUB AND BLADE ASSEMBLY
Chapter 64
1.
Check dynamic balance of tail rotor hub and blade
assembly.
2.
Adjust as required.
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Export Classification C,
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