TM 1-1510-224-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 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.
C19.
Landing gear pump motor operating longer than 14 seconds
in both the extension and retraction modes. The 2-ampere
circuit breaker does not trip.
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.
Faulty time delay PCB and pressure switch.
3-9
