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TROUBLESHOOTING GUIDE F PROPELLERS
Up
TM-1-1510-223-MTF Maintenance Test Flight Manual Army Model RC-12
Next
Defective No. 1 (4.7 PSI) torque pressure switch.
TM 1-1510-223-MTF
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 (AUTO-FEATHER
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 N, (AUTOFEATHER switch
in ARM position).
Defective or out of adjustment power lever switch.
F7.
Neither AUTOFEATHER
arm light illuminates when
POWER levers are advanced (AUTOFEATHER switch in
ARM position).
Defective AUTOFEATHER switch (overhead control panel).
F8.
One arm light does not illuminate when POWER levers
are advanced (AUTOFEATHER switch in ARM position).
a. Defective or out of adjustment power lever switch.
b. Defective No. 1 (4.7 PSI) torque pressure switch.
F9.
Both arm lights remain illuminated when one POWER
lever  is  retarded  (AUTOFEATHER  switch  in  ARM
position).
Defective or out of adjustment power lever switch.
3-22

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