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TROUBLESHOOTlNG GUIDE F - PROPELLERS
Up
TM-55-1510-218-MTF Maintenance Test Flight Manual Army Model C-12C C-12D and C-12F Aircraft
Next
Propeller slow to feather.
TM 55-1510-218-MTF
a. Defective or out of adjustment power
switch.
Neither autofeather arm light illuminates when
F7.
power levers are advanced (AUTOFEATHER
switch in ARM position).
a. Defective autofeather switch.
One arm light does not illuminate when power
F8.
levers are advanced (AUTOFEATHER switch in
ARM position).
a. Defective or out of adjustment power
switch.
b. Defective No. 1 (12 PSI) torque pressure
switch.
Both arm lights remain illuminated when one
F9.
power lever is retarded (AUTOFEATHER
switch in ARM position).
a. Defective or out of adjustment power
switch.
F10.  Propeller does not start to feather after engine
torque falls below 7% (AUTOFEATHER switch
in ARM position).
a. Defective No. 2 (6.5 PSI) torque pressure
switch on retarded engine.
b. Defective autofeather dump valve.
F11.  One arm light does not illuminate when power
levers are advanced to 90 percent N1 (AU-
TOFEATHER ARM-TEST switch in TEST po-
sition).
a. Defective No. 1 (12 PSI) torque pressure
switch.
F12.  Both arm lights extinguish when one power lever
is retarded (engine torque 7 to 12% on retarded
engine, AUTOFEATHER ARM-TEST switch
in TEST position).
a. Defective No. 2 (6.5 PSI) torque pressure
switch on retarded engine.
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