TM 55-1510-215-MTF
TROUBLESHOOTING GUIDE F- PROPELLERS
CONDITION
PROBABLE CAUSE
F1.
Propeller governor and secondary low pitch stop system
partially or wholly inoperative.
a. Defective blocking diode on propeller governor-secondary
low pitch stop test switch.
b.
Defective propeller governor test panel.
c.
Secondary stop sensor out of adjustment or defective.
d. Defective arc suppression capacitor or diode on
propeller reset or governor test solenoid.
F2.
Both propeller governor and secondary low pitch stop
test systems inoperative.
a.
Tripped propeller governor test circuit breaker.
b.
Defective wiring.
F3.
Both propeller governor and secondary low pitch
stop test systems inoperative on one engine.
a. Defective propeller governor-secondary low pitch
stop system test switch.
F4.
Neither propeller governs at specified RPM during
propeller governor tests.
a.
Defective secondary low pitch power lever switch.
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