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BEFORE LEAVING AIRCRAFT (CONT)
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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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Excessive starting RPM.
TM 55-1510-218-MTF
SECTION III. TROUBLESHOOTING
General. This section contains troubleshooting infor-
mation that has been referenced in Section II checklist.
This section lists possible conditions. abnormal condi-
itons and indications and probable causes. The infor-
mation is to be used only as a quick reference and may
not be all-encompassing.
TROUBLESHOOTING GUIDE A - STARTING
CONDITION
PROBABLE CAUSE
A1.
Both starters inoperative
a. Circuit breaker tripped in starter switch cir-
cuit.
b. Battery relay inoperative.
c. Low battery.
d. Loose connection or open circuit between
battery relay and left starter relay.
One starter inoperative.
A2.
a. Starter relay inoperative.
b. Poor ground at starter.
c. Open circuit.
d. Defective starting motor.
e. Switch defective.
Engine slow to start or does not start.
A3.
a. Low battery.
b. Generator field grounding relay or generator
field grounding disconnect relay defective
c. High resistance starter circuit.
d. Defective starter-generator.
e. Turbine dragging.
3-1

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