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Page Title:
Defective No. 1 (4.7 PSI) torque pressure switch. |
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 TM 1-1510-223-MTF
F10.
Propeller does not start to feather after engine torque
falls below 7% (AUTOFEATHER switch in ARM position).
a.
Defective No. 2 (3.1 PSI) torque pressure switch on
retarded engine.
b.
Defective autofeather dump valve.
F11.
One arm light d oes not illuminate when POWER levers
are advanced to 90 percent N1, (AU- TOFEATHER ARM
TEST switch in TEST position).
Defective No. 1 (4.7 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).
Defective No. 2 (3.1 PSI) torque pressure switch on retarded engine.
F13.
One arm light remains illuminated after torque of one
engine falls below 7% on retarded engine,
AUTOFEATHER ARM-TEST switch in TEST position).
a.
Defective No. 2 (3.1 PSI) torque pressure switch on
retarded engine.
b.
Defective autofeather dump valve.
F14.
Propeller slow to feather.
a.
Preformed packing leak at transfer tube or transfer
housing.
b.
Defective propeller governor.
F15.
Propeller slow to unfeather.
Defective propeller governor.
3-23
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