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External power fails to energize aircraft. |
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 TM 1-1510-223-MTF
c.
Internal connection links loose.
d.
External connector burned or pitted.
e.
Defective or reversed cells.
f.
Cell case current leakage.
C12.
External power fails to energize aircraft.
a.
Defective or incorrectly polarized external power source.
b.
Defective external power receptacle.
c.
Defective external power relay.
d.
Loose or wrong connection in external power circuit.
e.
Defective external power overvoltage monitor.
f.
APU voltage too high.
g.
APU defective.
h.
Defective switch.
i.
Circuit breaker tripped.
j.
External power feeder fault.
k.
Battery feeder fault.
C13.
Landing gear will not retract or extend.
a.
LANDING GEAR CONTROL circuit breaker
(overhead circuit breaker panel) tripped.
b.
LANDING GEAR POWER circuit breaker (under floor in
cabin) tripped.
c.
Landing gear power safety control circuit breaker (under
floor in cabin) tripped. floor in cabin) tripped.
e.
Landing gear safety power circuit breaker (under floor in
cabin) tripped.
f.
Faulty power pack motor.
g.
Faulty power relay.
3-7
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