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FD and ATT annunciations on the EADI
Up
TM-1-1510-223-MTF Maintenance Test Flight Manual Army Model RC-12
Next
Autopilot overpower check
TM 1-1510-223-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
NOTE
If the RUDDER BOOST annunciator is illuminated,
yaw damper and rudder boost will not engage.
(9) Radio altimeter - Check valid on EADI.
NOTE
To perform the following checks, the air data
computer must be valid and less than 60 knots, and
the radio altimeter must be valid and less than 50
feet.  These conditions must be satisfied to avoid
tripping  the  autopilot  servo  monitors  while
overpowering the autopilot servos.
(10) Control wheel - Move to mid-travel.
(11) AP ENGAGE switch-indicator (autopilot
controller)  -  Depress  to  engage
autopilot and yaw damper. Check that
AP ENGAGE and YD
ENGAGE
switch-indicators  on  the  autopilot
controller and the remote annunciators
on the instrument panel are illuminated.
k.
Autopilot elevator trim follow-up - Check as
follows:
(1) Control wheel - Hold aft of mid-travel.
(2) Trim  wheel  (autopilot  controller)  -
Should
run
nose
down
after
approximately 3 seconds.
(3) TRIM
DN
annunciator
(autopilot
controller) - Check illuminated after 6 to
8 seconds.
2-21

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