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External power fails to energize aircraft. - TM-1-1510-223-MTF0104
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TM-1-1510-223-MTF Maintenance Test Flight Manual Army Model RC-12
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Landing gear pump motor continues to run after the gear are extended
TM 1-1510-223-MTF
h.
Faulty remote-controlled circuit breaker (RCCB), (under
floor in cabin).
i.
Defective landing gear control switch.
j.
Defective wiring.
C14.
Landing gear fails to retract.
a.
Safety switch not closing.
b.
Pressure switch not closing.
c.
Gear selector valve stuck.
d.
Circuit is open between the selector valve and the power
e.
Time delay circuit opening prematurely.
f.
Hand pump handle improperly stowed.
g.
Service valve in up position.
h.
Defective landing gear control switch.
i.
Defective wiring.
C15.
Landing gear fails to extend.
a.
Service valve switches faulty.
b.
Landing gear selector valve stuck in up position.
c.
Control switch not providing power to the extend side of
selector valve.
d.
Defective limit switch.
e.
Defective landing gear control switch.
C16.
Landing gear pump motor continues to run after the gear
is retracted, causing the 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.
3-8

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