TM 55-1510-222-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
ENGINE RUNUP (CONT)
b, Power levers - Advance to ap-
proximately
25% torque, then
move autofeather switch to test
mode. Both ARM lights should
illuminate.
c. Left power lever - Retard.
(1) At 14 to 20% torque, check
right
AUTOFEATHER
ARM light extinguished.
(2) At 7 to 13% torque, check
left AUTOFEATHER light
extinguished (left propeller
starts to feather, right AU-
TOFEATHER ARM light
may momentarily illumi-
nate). Retard power lever
into ground tine if neces-
sary.
d. Left power lever - Set approxi-
mately 25% torque.
e. Repeat steps b. c, and d for
right engine.
f. Advance each power lever to
above 89% N1 individually.
with the autofeather switch in
the arm mode. ARM lights
should not illuminate. With
both power levers above 87 to
89% N1, both ARM lights
should illuminate.
g. Retard left power lever below
87% N1. Both lights should ex-
tinguish
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