TM 55-1510-222-MTF
C17.
Landing gear pump motor continues to run after
the gear are extended, causing the circuit break-
er 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-
cuit 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 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.
C21.
Landing gear pump motor operating longer than
14 seconds in the extended mode, but the 2 am-
pere circuit breaker does not trip.
a. Downlock switches failing to open and/or
the time delay PCB is faulty.
C22.
Landing gear LOW FLUID LEVEL light not
functioning.
a. Defective lamp.
b. Defective fluid indicator circuit.
C23.
Landing gear circuit breaker trips.
a. Shorted circuit.
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