Landing gear circuit breaker trips.
Grounded control circuit.
Grounded motor circuit.
Mechanical defect in gear causing overload.
Landing gear operation noisy.
Broken gear door linkage.
Worn actuator bearings.
Landing gear warning horn inoperative.
Horn circuit breaker tripped.
Open or grounded circuit.
Throttle switch defective or out of adjustment.
Main or nose gear down lock warning switch defective or
out of adjustment.
Defective warning horn module.
Landing gear warning horn inoperative when landing gear
control switch is in the up position and weight of aircraft
is on struts, but operates when a power lever is closed
and the gear is retracted.
Defective landing gear control switch.
Defective wiring to landing gear control switch.
Landing gear warning horn inoperative when power lever
is closed and landing gear is up.
Circuit breaker tripped.
Defective or out of adjustment power lever switch.
Defective wiring between power lever switches and
pedestal terminal board, and between landing gear
control switch and horn relay.