TM 55-1510-220-MTF
TROUBLESHOOTING GUIDE F - PROPELLERS
CONDITION
PROBABLE CAUSE
F1.
Incorrect propeller RPM.
a.
FORWARD
(1) Maximum stop on propeller governor
out of adjustment.
b.
REVERSE
(1) Airbleed link (reset arm) rigging out of adjustment.
(2) Propeller governor defective.
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 (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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