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Fluctuating torque and propeller RPM.
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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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Neither autofeather arm light illuminates when power levers are advanced
TM 55-1510-218-MTF
TROUBLESHOOTlNG GUIDE F - PROPELLERS
CONDlTION
PROBABLE CAUSE
F1. Propeller governor system partially or wholly in-
operative.
a. Defective blocking diode on propeller gover-
nor test switch.
b. Defective propeller governor test panel.
c. Defective arc suppression capacitor or diode
on propeller reset or governor test solenoid.
F2. Propeller governor test system inoperative.
a. Tripped propeller governor test circuit
breaker.
b. Defective wiring.
F3. Propeller governor test system inoperative on
one engine.
a. Defective propeller governor system test
switch.
F4. Propeller autofeather system inoperative (propel-
ler autofeather switch in ARM or TEST posi-
tion).
a. Tripped circuit breaker.
b. Defective arming light out relay or feather-
ing relay.
c. Defective arc suppression diode on relays or
feather dump valve.
d. Defective ground blocking diode.
F5. Autofeather circuit breaker trips (autofeather
switch in ARM or TEST position).
a. Defective ARM-TEST switch.
b. Defective wiring.
F6. One autofeather arm light illuminates when
power setting is less than 90 percent N1 (AU-
TOFEATHER switch in ARM position).
3-24

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