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CABIN CLIMB indicator
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TM-1-1510-223-MTF Maintenance Test Flight Manual Army Model RC-12
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POWER levers
TM 1-1510-223-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
d.
RUDDER BOOST/YAW CONTROL TEST switch
- Off (center).  Check that RUDDER BOOST
annunciator light is extinguished.
e.
RUDDER BOOST/YAW CONTROL TEST switch
- RUDDER BOOST.
f.
Yaw damper pushbutton switch - Depress to
engage yaw damper.  Check that YD ENG
annunciator is illuminated.
g.
Left POWER lever - Advance.  At a torque
differential of approximately 60%, observe that
the YD ENG annunciator light extinguishes, and
that the left rudder pedal begins to move
forward. Check that increasing power results in
increasing rudder pedal deflection.
h.
Left POWER lever - Slowly retard.
NOTE
YD ENG annunciator light may flicker at a torque differential
of approximately 50%.
i.
Repeat steps f through h for the right engine.
* 10. Autofeather/auto ignition - Check as follows:
F4-15
a.
AUTO IGNITION switches - ARM.
b.
POWER levers - Approximately 25% torque.
c.
AUTOFEATHER switch - Hold to TEST (both
AUTOFEATHER annunciators illuminated).
2-47

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