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AFT ROTOR AND PYLON AREA (RIGHT SIDE)
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TM-55-1520-240-PMD CH-47D Helicopter Manual
Next
NO. 1 ENGINE AREA (UPPER SECTION)
Seq.
Seq.
No.
Item and Procedure
No.
Item and Procedure
10.11
10.18
Swashplate for signs of damage, overheating, and
Power transfer unit for leakage and security.
accumulation of grease. Using a flashlight or other
Operate bleed valve on flight control hydraulic reservoir
10.19
suitable light source, visually inspect with a mirror or
until fluid is free from air.
flexible borescope the area between the underside of
Utility and flight control hydraulic reservoirs/coolers for
10.20
the rotating ring and stationary ring for any slinging or
proper fluid level, leaks, and security. Utility accumulator
clumping of grease/debris (i.e. seal, bearing cage, seal
for proper pressure.
spring, wire, or other material). A thin bead of grease
10.21
Combining and engine transmission cooling fan exhaust
around the sealing area is considered normal.
duct for security, damage, and obstruction.
10.12
Aft vertical shaft and bearing for leaks and signs of
10.22
Combining and engine transmission oil coolers for leaks,
overheating. Housing mounts and adjacent structure for
clogged or damaged core, and foreign objects. Cooler
cracks, buckling, damage, and loose or missing hardware.
housing for cracks and corrosion. Transfer tubes for
10.13
Upper boost servocylinders for leaks and security. Jam
damage. Oil pressure switches/transducer for condition.
sensors for extended warning indicators. Exposed piston
10.23
Combining transmission and engine transmission
rods for cleanliness.
reservoir sight gages (3 places) for proper oil level.
10.14
Flight control bellcranks, connecting links, and idlers
in pylon area for cracks and security. Connecting link
NOTE
swaged inserts for evidence of looseness.
10.15
Longitudinal cyclic trim yoke for security and condition.
To prevent overfilling transmission, check oil level
Yoke attaching hardware for security and condition.
within 30 minutes of shutdown. If transmission
10.16
Utility and No. 2 light boost cooling fan for condition and
has been shut down for more than 30 minutes,
adjacent structure for cracks.
operate rotors for a minimum of 5 minutes to verify
oil level before servicing.
10.17
Flight boost power control module for leaks and security.
Accumulator for proper precharge. Filters contamination
10.24
Combining transmission and engine transmission main
lube filters for extended warning indicators (3 places).
and pump fault indicator for extended warning indicators.
"FOD REMINDER"
CHECK WORK AREA FOR TOOLS AND PARTS AFTER COMPLETION OF MAINTENANCE AND INSPECTION.
TM 55-1520-240-PMD
Change 1 19

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