Fault Isolation (Aileron Trim Control System) - Piper Cheyenne IIIA Airplane Maintenance Manual

PIPER AIRCRAFT
PA-42-720 (Advanced Trainer)
MAINTENANCE MANUAL
A. Aileron and Tab (continued)
2. Fault Isolation - Aileron Trim Control System
CHART 2
FAULT ISOLATION (AILERON TRIM CONTROL SYSTEM)
Fault
Cause
Remedy
Lost motion between
trim control wheel
and trim tab.
Cable tension too low.
Cables not in place on
pulleys.
Adjust.
Install cables correctly.
Check cable guards.
Broken pulley.
Linkage loose or worn.
Replace pulley.
Check linkage and
tighten or replace.
Trim control wheel moves
with excessive resistance
System not lubricated
properly.
Lubricate system.
Cable tension too high. Adjust.
Pulleys binding or
rubbing.
Cables not in place on
pulleys.
Trim tab hinge binding.
Cables crossed or
routed incorrectly.
Replace binding pulleys.
Provide clearance between
pulleys and brackets.
Install cables correctly.
Check cable guards.
Lubricate hinge. If
necessary, replace.
Check routing of control
cables.
Trim tab fails to reach
full travel.
System incorrectly
rigged.
Check and/or adjust
rigging.
Either or both trim drums
incorrectly wrapped.
Check and/or adjust
rigging.
Trim indicator fails to
indicate correct trim
position.
Trim indicator unit not
adjusted properly.
Adjust.
EFFECTIVITY:
040-999
27-10-00
PAGE
3
Jan 10/90