TM 55-1510-221-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
ENGINE RUNUP (CONT)
extinguished (left propeller starts to
feather)
e.
Left power lever Set approximately 22%
torque.
f.
Repeat steps b, c, and d for right
engine.
g.
Advance each power lever to above 85
to 90% NI individually, with the
autofeather switch in the arm mode
ARM lights should not illuminate. With
both power levers above 85 to 90% N1,
both ARM lights should illuminate.
h.
Retard left power lever below 85% N1
Both lights should extinguish
i.
Repeat step h by retarding right power
lever, with left power lever above 85 to
90% N1.
*15. Propeller overspeed governors
F1-3
Check as follows:
a.
Propeller levers HIGH RPM.
b.
Left propeller governor test switch Hold
in TEST position.
c.
Left engine power lever. Advance until
overspeed governor governs propeller
(1830 to 1910 RPM). Observe
temperature and torque limits.
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