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YD ENGAGE pushbutton switch
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TM-1-1510-223-MTF Maintenance Test Flight Manual Army Model RC-12
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BATTERY switch
TM 1-1510-223-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
If the SBY annunciator on the flight director mode selector
does not illuminate within 10 seconds after the avionics
master switch is turned on, the autopilot has failed self-test
and is considered inoperative and should not be used. Do not
force the elevator trim system beyond the limits which are
indicated on the ELEVATOR trim tab indicator.
m. Electric elevator trim - Check.
(1) ELEV TRIM switch - On.
(2) Pilot and copilot trim switches
- Check operation.
Operation of the electric trim system should occur only by
movement of pairs of switches. Any movement of the elevator
trim wheel while depressing only one switch element indicates
a trim system malfunction.  Turn the electric elevator trim
control switch OFF and conduct flight by operating the
elevator trim wheel manually. Do not use autopilot.
(3) Pilot and copilot. Check individual element
for no movement of trim, then check proper
operation of both elements.
(4) Check  pilot  switches
override
copilot
switches while trim-
2-25

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