Main Gear And Doors; Fault Isolation - Main Gear And Doors - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
Landing Gear
The PA-42-720 uses a tricycle landing gear design, incorporating air oleo shock struts and is fully
retractable with covered gear doors.
A. Main Gear and Doors
1. Fault Isolation - Main Gear and Doors
NOTE: Place airplane on jacks before attempting fault isolation of landing gear system (refer to
7-10-00).
CHART 1
FAULT ISOLATION (MAIN GEAR AND DOORS)
Fault
No green light on panel
when gear are down.
Main gear fails to lock
up.
Main landing gear
shimmies during fast taxi,
takeoff and landing.
Strut bottoms on normal
landing or when taxiing
over rough ground.
Excessive or uneven
wear on main tires.
Doors come open in
flight.
Cause
Gear not locked in down
position.
Uplock cable out of
adjustment.
Actuator out of adjustment.
Tire out of balance.
Worn or loose wheel
bearings.
Worn torque link bolts
and/or bushings.
Insufficient air and / or fluid
in strut.
Defective internal parts
in strut.
Incorrect operating pressure.
Wheel out of alignment
(toe-in or toe-out).
Doors are rigged too tight.
Remedy
Adjust the gear
Adjust cable.
Adjust actuator.
Check balance and replace tire if
necessary. (refer to 32-40-00)
Replace and/or adjust wheel
bearings. (refer to 32-40-00)
Replace bolts and / or bushings.
Service strut with air and / or fluid.
Replace defective parts.
Inflate tire to correct pressure.
(refer to 32-40-00)
Check wheel alignment.
Adjust rigging of doors.
Micro switch on power
pack out of adjustment.
Doors fail to close.
EFFECTIVITY:
040-999
Adjust micro switch. (refer to
32-30-00)
Refer to 32-30-00 Chart 1 and
32-60-00 Chart 1.
32-10-00
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Jan 10/90