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BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-17.
100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
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
adequate lubrication and freedom of movement.
5.
Torque check forward short shaft disc pack coupling
fasteners 150 to 180 inch-pounds (16.9 to 20.3 Nm).
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.
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.
Page 30
Rev. 14
8 APR 2011
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-17.
100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
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.
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.
2.
Examine oil cooler blower impeller shaft for condition.
3.
Examine oil cooler blower hanger bearings and brackets
for grease leakage and evidence of overheating.
4.
Examine aft short shaft
(aluminium) for condition and
security.
5.
Examine aft short shaft (aluminium) splined adapter for
adequate lubrication and freedom of movement.
Page 31
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-17.
100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
6.
Torque check disc pack coupling fasteners
50 to
70 inch-pounds (5.7 to 7.9 Nm).
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.
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 32
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-18.
100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
DATE: __________________W.O. _____________________
FACILITY: _________________________________________
HELICOPTER S/N: __________________________________
REGISTRY NO.: ____________________________________
TOTAL TIME:_______________________________________
SIGNATURE:_______________________________________
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.
Page 33
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-18.
100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
NOTE
Pay particular attention to the upper left side tailboom
quadrant.
b. Cracks.
c. Deformation.
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.
Page 34
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-18.
100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
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.
2.
Examine segmented driveshafts and aft splined adapter for
condition and security. Check aft splined adapter for adequate
lubrication and freedom of movement.
3.
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.
Chapter 65
5.
Examine the tail rotor gearbox chip detector for
accumulated material.
Chapter 96
6.
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 35
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-18.
100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (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 36
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-19.
100-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 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.
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.
Page 37
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-19.
100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
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. Examine copilot collective control stick if installed.
2.
Examine the cyclic control stick for condition and security.
Examine copilot cyclic control stick if installed.
3.
Examine the anti-torque control pedals for condition and
security. 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.
Page 38
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-19.
100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
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.
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.
Page 39
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-19.
100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
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.
Chapter 96
ELECTRICAL AND AVIONICS
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.
Examine battery and vent tubes for condition and security.
3.
Perform operational test of the battery temperature
indicating system.
4.
Verify operation of litter door open warning light.
5.
Verify operation of landing lights.
6.
Verify operation of lower fuselage mounted position lights
(if installed).
Chapter 97
7.
Examine antennas for condition and security.
Page 40
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-19.
100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
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.
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.
Page 41
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-19.
100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
c. Examine drain lines for condition and security.
d. Examine aft fuselage longerons for cracks, corrosion,
and condition. Pay particular attention to the upper left longeron
between aft fuselage frame at STA 204.49 and frame at
STA 231.48.
e. Examine interface between longerons and engine pan
structure for cracks, corrosion, distortion and loose fasteners.
f. Inspect engine mount attachment structure for
condition.
CAUTION
ANY CRACK, CORROSION, OR LOOSE OR
SHEARED RIVET IS CAUSE FOR IMMEDIATE
GROUNDING OF THE HELICOPTER UNTIL THE
PROBLEM IS CORRECTED.
Chapter 53
g. Examine the four tailboom attachment fittings on
Chapter 4
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),
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.
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.
Page 42
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-19.
100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
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.
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.
Page 43
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-19.
100-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 4 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
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.
Chapter 96
5.
Check the voltage regulator setting.
Page 44
BHT-206L4-MM-1
PERIODIC INSPECTION
5-20.
100-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 100 hours of operation or every
12 calendar months.
Chapter 5
2.
Do all four events of the 100-hour progressive inspection.
Paragraph 5-16
through paragraph
5-19
Page 45/46
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-21.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
DATE: __________________W.O. _____________________
FACILITY: _________________________________________
HELICOPTER S/N: __________________________________
REGISTRY NO.: ____________________________________
TOTAL TIME:_______________________________________
SIGNATURE:_______________________________________
ZONE 1 — MAIN ROTOR SYSTEM
Chapter 11
PLACARDS AND MARKINGS
1.
Examine the placards, decals and markings. Make sure
they are readable, correctly applied and in agreement with the
applicable configuration of your helicopter.
Chapter 62
MAIN ROTOR SYSTEM
1.
Verify main rotor flap restraint for freedom of movement,
and for condition and security.
2.
Examine static stops and mast for evidence of mast
bumping.
3.
Remove main rotor blade leading edge erosion protection
tape, if installed.
4.
Examine main rotor blades for cleanliness and overall
condition. Examine for cracks, corrosion and de-bonding of
doublers.
5.
Examine leading edge of blades for corrosion and erosion.
Restore contour as necessary.
6.
Examine the tip weight cap for corrosion, cracks, erosion,
and deformation.
Page 47
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-21.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
7.
If applicable, reinstall main rotor blade leading edge
erosion protection tape.
8.
Examine the following main rotor hub assembly
components for condition and security:
a. Mast nut
b. Trunnion
c. Pillow blocks
d. Grips
e. Pitch horns
f. Static stops
9.
Examine pitch horn trunnion bearings for evidence of wear,
damage, and for security.
10. Examine main rotor yoke for corrosion or mechanical
damage as follows:
BHT-206L-CR&O
a. Examine fillet radius of both yoke spindles inboard of
wear sleeves for evidence of corrosion. If corrosion is visible,
remove with fine abrasive pad (C-407). If corrosion cannot be
removed with pads, or is extensive, disassemble hub for
inspection and repair.
NOTE
If the main rotor hub must be disassembled, omit
remaining steps.
b. Examine entire yoke centre section
(inboard and
outboard surfaces) for damage.
c. Touch up all repaired areas or areas of bare metal in
accordance with applicable main rotor hub inspection and repair
instructions.
Page 48
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-21.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
d. Ensure no sealant voids are visible around shields or
wear sleeve, strap fittings, and grip closure. Recoat with sealant
(C-308) as required. On main rotor hub assemblies up to and
including P/N 206-011-100-025, coat the remaining exposed
fillet radius and repaired surfaces with a film of corrosion
preventive compound (C-101).
ZONE 2 — TAIL ROTOR ASSEMBLY
Chapter 11
PLACARDS AND MARKINGS
1.
Examine the placards, decals and markings. Make sure
they are readable, correctly applied and in agreement with the
applicable configuration of your helicopter.
Chapter 64
TAIL ROTOR ASSEMBLY
1.
Clean tail rotor blades to maintain visibility of warning
stripes.
BHT-206L-CR&O
2.
Examine the following tail rotor hub assembly components
for condition and security of attachment:
a. Yoke
b. Pitch horns
c. Trunnion and trunnion caps
d. Counterweight hardware
Chapter 64
3.
Examine tail rotor blades as follows:
a. Tip block rivets for damage, corrosion, erosion, and
looseness.
b. Skin for bulges, nicks, dents, scratches, or other
damage.
c. Deformed or cracked skin in the area of the chordwise
weights.
d. Leading edge for erosion, nicks, dents or scratches.
Page 49
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-21.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 1 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
e. Bonded joints of blade skin mating area for suspected
voids or cracks. Pay particular attention in the area of tip block
and doublers.
f. Feathering bearings for looseness and cracks in uniball.
4.
Examine the following tail rotor hub and blade assembly
attaching components for condition and security:
a. Spacer
b. Rubber bumper
c. Static stop
d. Nut
e. Balance wheel
5.
Check dynamic balance of tail rotor hub and blade
assembly and adjust as required during ground run.
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 50
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-22.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
DATE: __________________W.O. _____________________
FACILITY: _________________________________________
HELICOPTER S/N: __________________________________
REGISTRY NO.: ____________________________________
TOTAL TIME:_______________________________________
SIGNATURE:_______________________________________
ZONE 3 — FORWARD DECK
Chapter 11
PLACARDS AND MARKINGS
1.
Examine the placards, decals and markings. Make sure
they are readable, correctly applied and in agreement with the
applicable configuration of your helicopter.
AIRFRAME (FORWARD DECK)
Chapter 71
1.
Open and examine forward fairing for condition and
security.
2.
Remove and examine transmission cowling for condition.
3.
Examine all fairing and cowling latches and/or fasteners for
condition.
4.
Examine top deck for condition, leaks and security.
Chapter 53
5.
Clean transmission deck.
6.
Examine air indication cowling and plenum for damage,
obstructions and cleanliness. Examine intake fairing windows
for damage and cleanliness.
7.
Examine inlet screen (if applicable) for missing or damaged
wires and rivets.
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300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
8.
Examine particle separator
(if applicable) vortex tubes,
ejector tubes, and ejector nozzles for cleanliness, condition, and
security.
9.
Examine forward deck drain(s) to ensure absence of
obstruction.
10. Examine antennas for condition and security.
Chapter 67
CONTROLS
1.
Examine the following flight control components for signs
of interference, corrosion, wear, mechanical damage and
security:
a. Control tubes.
b. Links.
c. Rod and bearings.
d. Bellcranks.
e. Bellcrank supports.
f. Attaching bolts and nuts.
2.
Inspect main rotor pitch links with a 3X magnifying glass for
damage, corrosion and cracks. Give particular attention to
swaged ends at jam nut or inserts.
Chapter 76
3.
Examine N2 control linkages on forward deck for condition
and security. Pay particular attention to the jackshaft assembly
for damage or evidence or twisting.
4.
Verify all control tubes and bellcranks for freedom of travel
throughout range.
Chapter 62
SWASHPLATE ASSEMBLY AND MAST
1.
Clean swashplate assembly and mast.
2.
Disconnect main rotor pitch links from outer ring.
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300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
3.
Disconnect idler (drive) link from outer ring.
4.
Examine swashplate drive assembly for axial, radial, and
accumulative wear.
5.
Disconnect boot from swashplate outer ring and lift up
temporarily. Examine boot for evidence of deterioration.
6.
Verify condition of duplex bearing, before lubrication, as
follows:
a. Rotate outer ring to check duplex bearing for condition.
Bearing must be smooth and show no evidence of roughness,
binding, dragging, or looseness.
7.
Examine pivot sleeve slot sidewalls for wear or
deterioration.
8.
Examine pivot sleeve bearings for wear, deterioration and
evidence of excessive axial play between pivot sleeve and
swashplate support.
9.
Examine collar set bushings for cracks and damage.
10. Examine swashplate support and uniball surfaces for
condition.
11. Examine collective lever to sleeve assembly pins and
bushings for condition.
12. Examine inner ring for condition. Examine for evidence of
contact with sleeve assembly.
13. Examine outer ring for condition.
14. Examine the upper inside diameter of swashplate support
for evidence of contact with the mast pole.
15. Verify and adjust swashplate tilt friction as required.
a. 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.
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BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-22.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
16. Connect and secure boot, idler (drive) link and main rotor
pitch links to outer ring.
17. Examine swashplate assembly for condition and security.
18. Examine mast for condition.
Chapter 62
19. Ensure no sealant voids are visible around the swashplate
drive collar set. Re-coat with adhesive (C-307) as required.
Chapter 29
HYDRAULIC SYSTEM
1.
Examine rigid and flexible fluid lines for chafing, leaks and
security.
2.
Examine hydraulic pump for leaks and general condition.
3.
Examine hydraulic pump shaft splines, rotor tachometer
splines, and oil pump splines for excessive wear.
Chapter 12
4.
Lubricate hydraulic pump shaft splines and rotor
tachometer splines.
5.
Examine hydraulic reservoir for leaks and general
condition.
6.
Examine servo actuators for leaks, condition and security.
7.
Examine servo actuator support for condition.
Chapter 67
8.
Verify linkage pivot bolts on hydraulic servo actuators for
freedom of rotation and security.
9.
Examine hydraulic filter red indicator button (two locations).
Button should not be extended.
Chapter 12
10. Verify fluid level in hydraulic tank. Replenish as required.
Replace fluid if color has changed color or if fluid emits bad
odor.
11. Examine manifold, relief valve, and solenoid valve for
leaks, condition and security.
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PROGRESSIVE INSPECTIONS
5-22.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
Chapter 63
TRANSMISSION AND PYLON ASSEMBLY
1.
Examine the following pylon support components:
a. Transmission link assemblies and bearings for damage
and deterioration.
b. Nodal beam flexures for condition and security.
c. Forward and aft nodal beam deck supports for condition
and security. Make sure of the torque of bolts only (bolts must
not rotate). If a bolt is loose, remove the nut, install a new nut
and torque 75 to 95 inch-pound (8.4 to 10.7 Nm).
d. Nodal beam stops for evidence of excessive contact
with nodal beam arms.
e. Transmission restraint for damage and spherical
bearings for excessive wear and security.
f. Stop mount for condition and security. Stop mount
bushings for wear.
g. All pylon support elastomeric components for evidence
of deterioration.
h. All pylon support hardware for security of attachment.
2.
Examine transmission assembly for condition and security.
3.
Examine transmission assembly for evidence of oil
leakage.
4.
Examine all fluid lines for chafing, damage and evidence of
leakage.
5.
Examine transmission oil for evidence of contamination.
6.
Examine transmission oil filter bypass indicator for
condition. Bypass button should not be extended.
7.
Inspect all transmission chip detectors for accumulated
material.
31 AUG 2021
Rev. 25
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5-22.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 2 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
Chapter 96
8.
Do a functional test of all transmission chip detectors.
9.
Make sure no sealant voids are visible around forward and
aft nodal beam deck mounted supports and isolation mount.
Recoat with sealant (C-308) as required.
MAIN DRIVESHAFT
Chapter 63
1.
Examine the engine to transmission driveshaft for condition
and security. Examine the components as follows:
a. Driveshaft for cracks, corrosion, and surface damage.
b. Flexframe and bolts for condition and signs of slippage.
Chapter 96
ELECTRICAL
1.
Examine all electrical components, wires, cables and
connectors in the area of the forward deck and transmission for
chafing, general 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.
Do a check of the 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,
do a check for leaks and make sure all systems are operational
and parameters are within Flight Manual limitations.
Page 56
Rev. 25
31 AUG 2021
Export Classification C,
BHT-206L4-MM-1
PROGRESSIVE INSPECTIONS
5-23.
300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
DATE: __________________W.O. _____________________
FACILITY: _________________________________________
HELICOPTER S/N: __________________________________
REGISTRY NO.: ____________________________________
TOTAL TIME:_______________________________________
SIGNATURE:_______________________________________
ZONE 4 — POWER PLANT
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.
AIRFRAME (POWER PLANT AREA)
Chapter 71
1.
Examine firewalls for condition and security.
Chapter 53
2.
Examine engine cowlings and doors for condition and
security. Using a bright light and mirror, inspect exposed upper
and lower edges of the joints between aluminium longerons and
titanium engine pan. Edge of sealant coating should be visible.
No indications of corrosion or cracks are acceptable.
3.
Examine engine pan area for evidence of loose fasteners
and damage. Restore cracked or missing sealant form engine
pan.
4.
Examine engine pan drains. Make sure that they are not
clogged.
Chapter 28
5.
Examine airframe fuel filter assembly for evidence of
leakage and security.
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300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
Chapter 71
6.
Examine engine mount legs for condition and security. Pay
particular attention for loose fasteners.
7.
Examine engine mount fittings for condition and security.
Applicable Service
8.
Examine rotor brake (if installed) for condition and security.
Instruction
Chapter 96
9.
Examine the primary electrical ground connection in
engine pan area for condition and security
POWER PLANT
Rolls-Royce 250-C30
1.
Perform engine inspection per the applicable Rolls-Royce
Series Operation and
Operation and Maintenance Manual.
Maintenance Manual,
14W2
Chapter 71
2.
Examine engine inlet bellmouth for obstruction and general
condition.
3.
Examine engine compartment hardware for security of
attachment.
4.
Examine engine for evidence of fuel or oil leaks.
5.
Examine all flexible and rigid lines for condition and
security.
a. Pay particular attention for chafing damage and kinked
lines.
6.
Examine exhaust stack for condition and security.
7.
Examine all engine-mounted accessories for condition and
security.
Chapter 75
8.
Examine the engine anti-ice solenoid valve for condition
and security.
Chapter 76
9.
Inspect fuel control lever bolt hole and bolt for wear.
Replace parts as required.
10. Deleted.
Page 58
18 JUL 2019
Export Classification C,
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
11. Deleted.
Chapter 95
12. Perform operational check of turbine outlet temperature
system.
Chapter 76
13. Examine engine controls for condition and security.
14. Verify operation of engine N1 control as follows:
a. Ensure proper throttle friction.
b. Check freedom of full throttle grip travel and idle release
operation. Return to closed position. Check copilot throttle if
installed.
c. Ensure fuel control stop lever contact with minimum and
maximum stops before throttle grip reaches travel limit.
NOTE
If dual controls are installed, it is permissible for
pointer to be 0.078 inch (1.98 mm) below 40° mark
when copilot twist grip is used.
d. Rotate throttle grip to idle detent, fuel control pointer
should be no more than 0.01 inch (0.25 mm) below the 40°
mark on the quadrant.
e. Verify control linkage for excessive looseness, lost
motion, and binding.
15. Verify operation of engine N2 control as follows:
a. Position N2 governor actuator to full DECREASE
(extended).
b. Lift collective stick full up.
c. Position N2 governor actuator to full INCREASE
(retracted).
d. Verify for clearance between governor stop and lever
stop arm.
Export Classification C,
18 JUL 2019
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300-HOUR AIRFRAME PROGRESSIVE INSPECTION — EVENT NO. 3 (CONT)
INITIAL
DATA REFERENCE
INSPECTION TASK DESCRIPTION
MECH OTHER
e. Lower collective stick full down.
f. Position N2 governor actuator to full DECREASE
(extended).
g. Verify for clearance between governor stop and lever
stop arm.
Chapter 71
h. Verify control linkage for excessive looseness, lost
motion, and binding.
Chapter 71
16. Examine N1 and N2 tachometer generator shaft splines
Chapter 12
and gearbox adapter splines for condition. Clean and lubricate
shaft splines.
FUEL SYSTEM
Chapter 28
1.
Inspect airframe fuel filter head as follows:
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 the lower fuel filter drain port and out of the fuel filter outlet
supply line.
Page 60
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