Cessna 150M - Trim Tab; Trim Tab Actuator

8-3. TROUBLE SHOOTING (Cont).
TROUBLE PROBABLE CAUSE
REMEDY
LOST MOTION BETWEEN
Cable tension too low.
Adjust tension.
CONTROL WHEEL AND
TRIM TAB.
Broken pulley.
Replace defective pulley.
Cables not in place on pulleys.
Install cables correctly.
Worn trim tab actuator.
Remove and replace worn actuator.
Actuator attachment loose.
Tighten.
TRIM INDICATOR FAILS TO
Indicator incorrectly engaged
Reset indicator.
INDICATE CORRECT TRIM on wheel track.
POSITION.
INCORRECT TRIM TAB TRAVEL Stop
blocks loose or
incorrectly adjusted.
9-4. TRIM TAB. (Refer to figure 8-2.)
9-5. REMOVAL AND INSTALLATION.
a. Disconnect push-pull tube (2) from horn assem-
bly (3).
b. Drill out rivets attaching hinge to elevator.
NOTE
After tab has been removed and if hinge pin
is to be removed, it is necessary to spread
the crimped ends of the hinge before driving
out pin. When a pin has been installed,
crimp ends of hinge to prevent pin from work-
ing out.
c. Reverse preceding steps for installation.
9-6. TRIM TAB ACTUATOR.
9-7. REMOVAL AND INSTALLATION. (Refer to
figure 9-1.)
ICAUTION\
Position a support stand under tail tie-down
ring to prevent tailcone from dropping while
working inside.
a. Remove baggage compartment aft wall for ac-
cess.
b. Remove safety wire and relieve cable tension
at turnbuckle (15).
9-2 Change 3
Adjust stop blocks on cables.
c. Disconnect push-pull tube (12) from actuator
(9) •
d. Remove access plate from underside of right
hand stabilizer beneath actuator.
e. Remove chain guard (8) and disengage chain
(8A) from actuator sprocket.
f. Remove screws (8B) and spacers (10) attaching
actuator clamps to stabilizer structure (11) and care-
fully work actuator out through access opening.
g. Reverse the preceding steps for reinstallation.
Rig trim system in accordance with paragraph 9-12,
safety turnbuckle (15) and reinstall all items removed
for access.
9-7A. DISASSEMBLY. (Refer to figure 9-2.) I
a. Remove actuator in accordance with paragraph
9-7.
b. Disassemble actuator assembly (1) as illustrated
in Detail A as follows:
1. Remove chain guard (3) if not previously re-
moved in step "e" of paragraph 9-7.
2. U sing suitable punch and hammer, remove
groov-pins (8) securing sprocket (5) to screw (9) and I
remove sprocket from screw.
3. Unscrew threaded rod end (15) and remove
rod end from actuator.
4. Remove groov-pins (10) securing bearings (6 I
and 14) at the housing ends.
5. Lightly tap screw (9) toward the sprocket
end of housing, remove bearing (6) and collar (7).
6.
Lightly tap screw (9) in the opposite direc-
tion from sprocket end, remove bearing (14), O-ring
(13) and collar (7).