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External power fails to energize aircraft. - TM-55-1510-218-MTF0094
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TM-55-1510-218-MTF Maintenance Test Flight Manual Army Model C-12C C-12D and C-12F Aircraft
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Landing gear (hydraulic) pump motor continues to run after the gear is retracted, causing the circuit breaker to trip.
TM 55-1510-218-MTF
C15.
Landing gear (mechanical) will extend but will
not retract.
a. Open circuit between landing gear switch
and control relay.
b. Up solenoid of control relay inoperative.
c. Open circuit between control relay and up
winding in motor.
C16.
Landing gear (hydraulic) fails to retract.
a. Safety switch not closing.
b. Pressure switch not closing.
c. Gear selector valve stuck.
d. Circuit is open between the selector valve
and the power relay.
e. Time delay circuit opening prematurely.
f. Hand pump handle improperly stowed.
g. Service valve in up position.
C17.
Landing gear (mechanical) will retract but will
not extend.
a. Open circuit.
b. Down limit switch inoperative.
c. Open circuit between control relay and
down winding of motor.
C18.
Landing gear (hydraulic) fails to extend.
a. Service valve switches faulty.
b. Landing gear selector valve stuck in up posi-
tion.
c. Control switch not providing power to the
extend side of selector valve.
C19.
Landing gear (mechanical) circuit breaker trips.
a. Grounded control circuit.
b. Grounded motor circuit.
c. Mechanical defect in gear causing overload.
3-9

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