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Landing gear fails to retract.
Up
TM-1-1510-223-MTF Maintenance Test Flight Manual Army Model RC-12
Next
Defective or out of adjustment down-lock switches.
TM 1-1510-223-MTF
C17
Landing gear 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.
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.
C21.
Landing gear pump motor operating longer than 14
seconds in the extended mode, but the 2 ampere circuit
breaker does not trip.
Downlock switches failing to open and/or the time delay PCB is faulty.
C22.
Landing gear HYD FLUID LOW light not functioning .
a.  Defective lamp.
b.  Defective fluid indicator circuit.
C23.
Landing gear circuit breaker trips.
Shorted circuit.
3-9

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