TM 55-1510-221-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
h.
Propeller lever - Move out of
feather Propeller tachometer
must reach 1000 RPM in 30
seconds or less.
l.
Propellers - Synchronized.
j.
Power - As required.
k.
Repeat procedure for opposite
engine.
*11.
Propeller autofeathering system
F14,15
and propeller unfeathering - Check
as follows:
a.
Climb power - Set (N1 above
92%)
b.
Autofeather switch - ARM
c.
Airspeed - 120 KIAS.
d.
Propeller levers - Set 2000
RPM.
e.
Power levers - Set 100%
torque.
f.
Condition lever (engine to be
feathered) - IDLE CUTOFF
*g.
Record the time from fuel cut-
off until propeller rotation is
completely stopped (no rota-
tion). Autofeather time is a
function of oil temperature as
shown in figure 4 (Propeller is
considered to be feathered
when the blades are individual-
ly visible to the human eye, but
the propeller is still rotating.)
2-55
