TM 55-1510-215-MTF
C25. Landing gear handle light is illuminated with gear up and
locked.
a.
Defective or out of adjustment up-lock switch.
C26. Landing gear handle light inoperative.
a.
Defective or out of adjustment up-lock or down-lock switch.
b.
Defective landing gear control switch.
C27. Flaps fail to extend or retract.
a.
Tripped circuit breaker.
b.
Defective flap motor.
c.
Defective flap control switch.
d.
Defective mechanical component in actuator system.
e.
Defective wiring.
C28. Flap position indicator inoperative.
a.
Tripped circuit breaker.
b.
Defective position indicator.
c.
Defective position transmitter.
d.
Defective wiring.
C29. Pitot tube heater fails to operate.
a.
Tripped circuit breaker.
b.
Defective heater.
c.
Defective wiring.
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