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PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Main Gear and Doors (continued)
15. Installation of Main Gear Door Assembly
(a) Install the inboard gear door by aligning the hinge bracket holes with the bearings and installing
and securing bolt assembly. Install the actuating cylinder rod to the door.
(b) Install the outboard gear door by aligning the hinge bracket holes with the bearings and
installing and securing bolt assemblies. Attach the actuating rods between the door and
landing gear housing.
16 Adjustment of Main Gear Doors
(a) Check that the main landing gear is properly adjusted.
CAUTION: DAMAGE TO THE DOOR CAN RESULT IF RODS ARE TOO SHORT.
(b) Adjust outboard door rods to maximum length and bolt them to bosses on the gear housing.
Retract gear and observe the amount of gap. Shorten rods by several turns of the rod ends
and retract the gear again. Repeat until the door closed properly.
(c) Adjust the inboard door using same procedure used for the outboard door.
NOTE: If it is necessary to fit new doors or refit the present doors, maintain a gap of
approximately 0.062 of an inch except at the hinge side, between the door, and the
skin surface of the wing. A gap of approximately 0.092 of an inch must be maintained
at the hinge side of the door.
17. Inspection of Main Gear Door Assembly
Inspect the outboard or inboard doors for cracks or bent skin, loose hinge brackets, and worn or
corroded bearings.
18. Cleaning of Main Gear Door Assembly
Clean all parts with a suitable cleaning solvent.
19. Repair of Main Gear Door Assembly
Repair to door assemblies is limited to replacing hinge bearing, bracket or rivets, minor skin
repairs, and painting.
EFFECTIVITY:
040-999
PAGE 18
Jan 10/90
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