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FORWARD PYLON (LEFT SIDE)
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TM-55-1520-240-PMD CH-47D Helicopter Manual
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POWER ON CHECKS
Seq.
Seq.
No.
Item and Procedure
No.
Item and Procedure
14.18
15.4
Rotary-wing blades for damage, cracks, and unbonding.
Longitudinal cyclic trim yoke for security and condition.
Trim tabs for cracks, damage, and unbonding. Tip
Yoke attaching hardware for security and condition.
covers for damage and security. Nose cap for damage
15.5
Visible area of forward transmission oil cooler for leaks,
or unbonding. Shock absorber attachment brackets,
security, clogged or damaged cores, loose or missing
including filament winding filler material, for cracks and
hardware.
voids. Check blade root end up to, but not including, first
15.6
Forward transmission area for evidence of leaks, damage,
lag damper bracket winding for cracks. Ensure bottom
security of components, and loose or missing hardware.
surface of blade root end is not contacting pitch varying
15.7
Upper boost servocylinders for leakage and security. Jam
housing lug.
sensors for extended warming indicators. Exposed piston
Flight control hydraulic reservoir for proper fluid level,
14.19
rods for cleanliness.
leaks, and security. Cooler inlet for cleanliness and
15.8
Swashplate for signs of damage, overheating, and
obstructions.
accumulation of grease. Using a flashlight or other
14.20
Check for slipped bushings and cracked pitch housing
suitable light source, visually inspect with a mirror or
lugs.
flexible borescope the area between the underside of
14.21
Forward transmission fairing work platforms, access
the rotating ring and stationary ring for any slinging or
doors, and panels for damage, closed and latched.
clumping of grease/debris (i.e. seal, bearing cage, seal
Latches and latch plates for security and condition. NVG
spring, wire, or other material). A thin bead of grease
light for condition.
around the sealing area is considered normal.
FORWARD PYLON (RIGHT SIDE)
15.9
Drive arms and collar for damage and security of
hardware.
15.1
Flight boost power control module for leaks and security.
Pitch links for chafing, damage, and security. Upper and
15.10
Accumulator for proper prechange. Filter contamination
lower bearings for liner unbonding.
and pump fault indicators for extended warning indicator.
15.11
Pitch link boots and weather protective cover for condition.
15.2
Power transfer unit for leakage and security.
15.3
Hydraulic lines in forward transmission area for leaks,
chafing, cracked or broken clamps, and proper support.
"FOD REMINDER"
CHECK WORK AREA FOR TOOLS AND PARTS AFTER COMPLETION OF MAINTENANCE AND INSPECTION.
TM 55-1520-240-PMD
24  Change 1

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