TM 1-1510-225-MTF
C16.
Landing gear pump motor continues to run after
the gear is retracted, causing landing gear pump
motor circuit breaker to trip.
a. Pressure switch not opening on high pressure.
b. Low accumulator charge.
c. Excessive fluid leakage past the piston seals in the
actuators.
d. Defective valve in the power pack.
C17.
Landing gear pump motor continues to run after
the gear are extended, causing landing gear pump
motor circuit breaker to trip.
a. Downlock switches are not opening.
b. Power relay points stuck.
c. Defective limit switch.
C18.
Landing gear pump motor continues to run when
the gear is extended or retracted, causing the cir-
cult breaker to trip.
a. Weak power pack motor.
b. Low voltage to the motor.
c. Low fluid level.
d. Blockage in the hydraulic system.
C19.
Landing par pump motor operating longer than
14 seconds in both the extention and retraction
modes The 2-ampere circuit breaker does not
trip.
a. Low voltage.
C20.
Landing gear pump motor operating longer than
14 seconds in the retract mode, but the 2-ampere
circuit breaker does not trip.
a. Faulty time delay PCB and pressure switch.
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