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Battery charge annunciator light inoperative.
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TM-55-1510-218-MTF Maintenance Test Flight Manual Army Model C-12C C-12D and C-12F Aircraft
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Ventilation blower has excessive vibration.
TM 55-1510-218-MTF
a. Defective flame detector.
b. Defective fire protection test switch.
Fire detector circuit breaker trips.
C51.
a. Short circuit in wiring or components.
Left FIRE PULL warning light illuminates in
C52.
all test positions but right FIRE PULL warning
light does not.
a Defective right fire detection control ampli-
fier.
b. Defective wiring between fire warning power
circuit breaker and right control amplifier.
Right FIRE PULL warning light illuminates in
C53.
all test positions but left FIRE PULL warning
light does not.
a. Defective left fire detection control amplifi-
er.
b. Defective wiring between fire warning power
circuit breaker and left control amplifier.
Ventilation blower will not run.
C54.
a. Tripped vent blower circuit breaker.
b. Defective motor brushes.
c. Defective wiring.
Ventilation blower draws excessive current.
C55.
a. Misaligned or preloaded bearings.
b. Defective bearings.
Ventilation blower runs at reduced speed.
C56.
a. Brushes not seated properly.
Ventilation blower draws excessive current and
C57.
runs it high speed.
a. Shorted turns in field windings.
Ventilation blower draws excessive current and
C58.
speed surges.
3-15

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