TM 55-1510-219-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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