TM 55-1510-220-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
LOW SPEED SYSTEMS CHECK (CONT)
(15)
Propeller lever - Move out of feather. Propeller tachometer must reach 1000 RPM in 30
seconds or less.
(16)
Propellers - Synchronized.
(17)
Power - As required.
g.
Repeat procedure for opposite engine.
*11. Propeller autofeathering system and propeller unfeathering - Check as follows:
F14,15
a.
Climb power - Set (N1 above92%).
b.
Autofeather switch - ARM.
c.
Airspeed - 103 KIAS.
d.
Propeller levers - Set 2000 RPM.
e.
Condition lever (engine to be feathered) - IDLE CUTOFF.
*f.
Record the time from fuel cut- off until propeller rotation is completely stopped (no rotation).
Autofeather time is a function of oil temperature as shown in figure 4. (Propeller is considered to be
feathered when the blades are individually visible to the human eye, but the propeller is still rotating.)
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