TM 1-1510-224-MTF
TROUBLESHOOTING GUIDE F - PROPELLERS
CONDITION
PROBABLE CAUSE
F1.
Propeller governor system partially or completely
inoperative.
Defective propeller governor test switch.
F2.
Propeller governor test system inoperative.
a. Tripped propeller governor test circuit breaker.
b. Defective wiring.
c. Defective switch.
d. Defective propeller governor reset solenoid.
F3.
Propeller governor test system inoperative on one engine.
a. Defective PROP GOVERNOR test switch.
b. Defective propeller governor reset solenoid.
F4.
Propeller autofeather system inoperative (propeller
AUTOFEATHER switch in ARM or TEST position).
a. Tripped circuit breaker.
b. Defective arming light out relay or feathering 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.
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