TM 55-1510-215-MTF
*C.
Autopilot System Check (KFC 250).
WARNING
Ensure that the autopilot has been disengaged and
check that the aircraft manual trim indicator is set to
the takeoff position before takeoff. Operating the
autopilot on the ground may cause the autotrim to
run because of back force generated by the elevator
downsprings or pilot induced forces.
NOTE
If the AUTOPILOT circuit breaker is pulled, the red
TRIM failure annunciator light on the autopilot
annunciator panel will be disabled and only the aural
alert will sound if an electric trim malfunction occurs.
(1)
Verify that all autopilot modes are disengaged.
(2)
Preflight test button (autopilot mode controller) - Press and
hold.
(3)
Autopilot mode annunciator panel annunciator lights - Check
all illuminated. TRIM annunciator light should flash at least
four times, but no more than six times.
(4)
Aural trim alert - Listen for sound.
(5)
YAW DAMP indicator light (autopilot mode controller) -
Check illuminated.
4-3
