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MODEL 182 & T182 SERIES SERVICE MANUAL
h.
Rotate trim wheel to position trim tab up and
down. readjusting actuator screw as required to ob-
WARD sprocket of the trim tab actuator while the
tain overtravel in both directions.
manual trim chain connects to the AFT sprocket of
i.
Position stop blocks and adjust as illustrated in
the actuator.
When the clutch of the drive assembly
figure 9-2 to degree of trim tab travel specified in
is not energized. the drive assembly
free wheels"
figure 1-1.
and. therefore. has no effect on manual operation.
j.
Install pedestal cover and adjust trim tab pointer
to the center of the "TAKE-OFF" triangle with the
trim tab set at 0°.
k.
Safety turnbuckle and reinstall all items removed
in step "a."
Be sure trim tab moves in correct direction
when operated by the trim control wheel.
9-19. ELECTRIC ELEVATOR TRIM INSTALLATION.
Nose down trim corresponds to tab up position.
(See figure 9-4.)
9-21. REMOVAL AND INSTALLATION.
(See
9-20. DESCRIPTION.
An electric elevator
trim
figure 9-4.)
assist system may be installed consisting of 2
a.
Remove covers (12) beneath tab actuator assem-
switches mounted on the pilot's control wheel. a cir-
bly (6) and drive assembly.
cuit breaker mounted in the center instrument pedes-
b.
Disconnect electrical connectors (13 and 14) and
tal. fuselage wiring running aft to the 12 Volt D. C.
relieve tension on drive chain (8) at turnbuckle (9).
electric drive assembly and a chain connecting the
c.
Remove chain guard (10) from tab actuator.
drive assembly to an additional sprocket mounted on
d.
Remove mounting bolts from drive assembly and
the standard elevator trim actuator.
The electric
actuator and remove units from the aircraft.
drive assembly includes a motor. sprockets and a
e.
Reverse preceding steps for reinstallation.
chain driven solenoid type adjustable clutch. The
Check
system rigging in accordance with paragraph
electric drive assembly chain connects to the FOR-
9-24.
f.
Reinstall all items removed for access.
9-22. TROUBLE SHOOTING.
TROUBLE
PROBABLE CAUSE
REMEDY
SYSTEM INOPERATIVE.
Circuit breaker out.
Check visually.
Reset breaker.
Defective circuit breaker.
Check continuity.
Replace defective
breaker.
Defective wiring.
Check continuity.
Repair wiring.
Defective trim switch.
Check continuity.
Replace defective
switch.
Defective trim motor.
Remove and bench test.
Replace
defective motor.
TRIM MOTOR OPERATING -
Defective clutch solenoid.
Check continuity.
Replace
TRIM TAB FAILS TO MOVE.
solenoid.
Improperly adjusted clutch
Check and adjust spanner nuts
tension.
for proper tension.
Disconnected or broken
Operate manual trim wheel.
cable.
Connect or replace cable.
Defective actuator.
Check actuator operation.
Replace actuator.
9-23. CLUTCH ADJUSTMENT.
(See figure
c.
Disconnect electric motor by unplugging electri-
a.
Remove access covers (12) below drive assembly.
d.
Remove mounting bolts from drive assembly.
b.
Remove safety wire and relieve drive chain ten-
It is necessary to remove unit from aircraft to make
sion at turnbuckle (9).
necessary adjustments to clutch.
9-9
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Table of Contents
Troubleshooting
