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Autofeather/auto ignition
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TM-1-1510-223-MTF Maintenance Test Flight Manual Army Model RC-12
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Primary governors
TM 1-1510-223-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
ENGINE RUNUP (CONT)
d.
POWER levers - Retard individually.
(1) At  13%  to  19%  torque  -  Opposite
AUTOFEATHER annunciator extinguished,
IGN ON annunciator illuminated.
(2) At
7%
to
13%
torque
-
Both
AUTOFEATHER annunciators extinguished
(propeller starts to feather).
NOTE
The POWER lever may have to be lifted and pulled towards
the ground fine gate in order to attain the 7% to 13% torque.
AUTOFEATHER annunciators will illuminate and extinguish
with each fluctuation of torque as the propeller feathers.
(3) Return POWER lever to approximately 25%
torque.
e.
Repeat steps c and d for other engine.
f.
AUTOFEATHER switch - ARM.
g.
AUTO IGNITION switches - Off.
* 11. Propeller overspeed governors - Check as follows:
a.
PROP levers - HIGH RPM.
b.
PROP GOVERNOR test switch - Hold in TEST
position.
c.
Left engine POWER lever - Advance
until
overspeed governor governs propeller (1540 to
1580
2-48

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