TUNNEL AREA

Seq.

No.

Item and Procedure

No.

Item and Procedure

12.11

Upper boost servocylinders for leaks and security. Jam

Drain cups for debris. Support brackets for cracks,

sensors for extended warning indicators. Exposed piston

bending, and twisting. Retainer nut for presence of cotter

pin. Forward adapter for freedom of movement (forward

rods for cleanliness.

and aft) within the forward transmission input pinion.

12.12

Longitudinal cyclic trim link and actuator for security and

Hydraulic lines in tunnel area for leaks, chafing and

condition. Longitudinal cyclic pitch actuator and connector

13.2

for security and condition.

proper support.

12.13

Longitudinal cyclic trim yoke for security and condition.

13.3

Flight control connecting links, idlers, and control arms

Yoke attaching hardware for security and condition.

throughout tunnel area for security, damage, corrosion,

cleanliness, and evidence of interference. Connecting link

12.14

Flight control bellcranks, connecting links, and idlers

swaged inserts for evidence of looseness.

in pylon area for cracks and security. Connecting link

swaged inserts for evidence of looseness.

13.4

Tunnel access covers and struts for damage. Covers

Utility and flight control hydraulic reservoirs/coolers for

closed and latched.

12.15

proper fluid level, leaks, and security. Cooler inlets for

13.5

Formation lights for security, damage, and trapped

moisture.

cleanliness and obstructions.

13.6

Antennas for condition.

12.16

Power transfer unit for leakage and security.

TUNNEL AREA

FORWARD PYLON (LEFT SIDE)

14.1

Forward transmission cooler air inlet (behind STA 120.00)

13.1

Tunnel area for debris under synch shafts. Shafts for

scoring, chafing, and damage. Adapters and plates

for cleanliness and foreign objects. Entire compartment

for debris.

for cracks and security of hardware. Shock mounts for

security and freedom of movement. Rubber for cuts,

14.2

Brake accumulator for proper pressure.

cracks or unbonding between rubber and metal parts,

Second and first stage bellcranks and connecting links for

14.3

and evidence of contact with support brackets. Shock

damage and security.

mount support bushings for wear. Bearings for evidence

14.4

Flight boost cooler fan for condition.

of overheating.

"FOD REMINDER"

CHECK WORK AREA FOR TOOLS AND PARTS AFTER COMPLETION OF MAINTENANCE AND INSPECTION.

TM 55-1520-240-PMD

22 Change 1