Quantcast Landing gear (hydraulic) pump motor continues to run after the gear is retracted, causing the circuit breaker to trip.

 

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Landing gear (mechanical) will extend but will not retract
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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) low fluid level light not functioning
TM 55-1510-218-MTF
C20. Landing gear (hydraulic) pump motor continues
to run after the gear is retracted, causing the cir-
cuit breaker to trip.
a. Pressure switch not opening on high pres-
sure.
b. Low accumulator charge.
c. Excessive fluid leakage past the piston seals
in the actuators.
d. Defective valve in the power pack.
C21. Landing gear (hydraulic) pump motor continues
to run after the gear are extended, causing the
circuit breaker to trip.
a. Downlock switches are not opening.
b. Power relay points stuck.
C22. Landing gear (hydraulic) pump motor continues
to run when the gear is extended or retracted,
causing the circuit breaker to trip.
a. Weak power pack motor.
b. Low voltage to the motor.
c. Low fluid level.
d. Blockage in the hydraulic system.
C23. Landing gear (hydraulic) pump motor operating
longer than 23 seconds in both the extension and
retraction modes. The 2-ampere circuit breaker
does not trip.
a. Low voltage.
C24. Landing gear (hydraulic) pump motor operating
longer than 23 seconds in the retract mode, but
the 2-ampere circuit breaker does not trip.
a. Faulty time delay PCB and pressure switch.
C25. Landing gear (hydraulic) pump motor operating
longer than 23 seconds in the extended mode
but the 2 ampere circuit breaker does not trip.
a. Downlock switches failing to open and/or
the time delay PCB is faulty.
3-10

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