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Short circuit in wiring or components.
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TM-1-1510-223-MTF Maintenance Test Flight Manual Army Model RC-12
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TROUBLESHOOTING GUIDE D CAUTION PANEL
TM 1-1510-223-MTF
b.
Defective wiring between fire warning power circuit
breaker and left fire detector.
C48.
Ventilation blower will not run.
a.
Tripped vent blower circuit breaker.
b.
Defective motor brushes.
c.
Defective wiring.
d.
Defective motor.
e.
Defective switch.
C49.
Ventilation blower draws excessive current.
a.
Misaligned or preloaded bearings.
b.
Defective bearings.
C50.
Ventilation blower runs at reduced speed.
Brushes not seated properly.
C51.
Ventilation blower draws excessive current and runs at
high speed.
Shorted turns in field windings.
C52.
Ventilation blower draws excessive current and speed
surges.
Shorted turns in armature.
C53.
Ventilation blower has excessive vibration .
a.
Armature out of balance.
b.
Fan damaged.
c.
Fan out of balance.
d.
Defective bearings.
C54.
Propeller deice inoperative.
a.
Circuit breaker tripped.
b.
Propeller deice switch defective.
c.
Ammeter defective.
d.
Defective propeller deice timer.
3-14

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