Cessna 150M - Page 106

7-4. TROUBLE SHOOTING.
NOTE
Due to remedy procedures in the following trouble shooting
chart it may be necessary to re-rig system, refer to para-
graphs 7-16 and 7-19.
TROUBLE
PROBABLE CAUSE
REMEDY
BOTH FLAPS FAIL TO MOVE.
Blown fuse.
Check visually.
Replace fuse.
Defective switch.
Place jumper across switch.
Replace if defective.
Defective motor.
Remove and bench test motor.
Replace if defective.
Broken or disconnected wires.
Run a continuit:; check.
Connect or repair wiring.
Defective or disconnected
Connect or replace transmission.
transmission.
Defective limit switch.
Check continuity of switches.
Replace switches found defective.
BINDING IN SYSTEM AS FLAPS Cables not riding on pulleys.
Check visually.
Route cables
ARE RAISED AND LOWERED.
correctly over pulleys.
Bind in drive pulleys.
Check drive pulleys in motion.
Replace drive pulleys found
defective.
Broken or binding pulleys. Check pulleys for free rotation
or breaks. Replace defective
pulleys.
Frayed cable.
Check visually. Replace defective
cable.
Flaps binding on tracks.
Observe flap tracks and rollers.
Replace defective parts.
LEFT FLAP FAILS TO MOVE.
Disconnected or broken cable.
Check cable tension. Connect
or replace cable.
Disconnected push-pull rod.
Check visually. Attach push-pull
rod.
INCORRECT FLAP TRAVEL.
Incorrect rigging. Refer to paragraph 7-16.
Defective limit switch. Check continuity of switches.
Replace switches found defective.
FLAPS FAIL TO RETRACT.
Defective or disconnected Check continuity of switch.
UP-LIMIT switch.
Connect or replace limit
switch.
FLAPS FAIL TO EXTEND.
Defective or disconnected Check continuity of switch.
DOWN-LIMIT switch.
Connect or replace limit
switch.
7-2 Change 1