TM 55-1510-215-MTF
(31) Control wheel steering switch (control wheel) - Depress and
center the control wheel about the roll axis, then release.
(32) Heading (HDG) switch (autopilot mode controller) - Press
ON.
(33) Heading selector knob (horizontal situation indicator) - Set
indicator to command a right turn. The control wheel
should rotate clockwise.
(34) Heading selector knob (horizontal situation indicator) - Set
indicator to command a left turn. The control wheel should
rotate counterclockwise.
(35) Autopilot (AP) switch (autopilot mode controller) - OFF.
(36) Flight director (FD) switch (autopilot mode controller) -
Disengage.
(37) Electric trim switch (control wheel) - Move aft until the full
nose-up trim position has been attained, then move switch
forward and simultaneously begin timing. When the full
nosedown trim position has been attained, release switch
and read time. The time required for trim system to run
from full nose up to full nose down should be 45 ± 9
seconds.
(38) If the autopilot fails the preflight test, the AUTOPILOT circuit
breaker should be pulled. Manual electric trim may still be
used.
If the electric trim system fails the preflight test, the ELECT
TRIM circuit breaker should be pulled and neither the
electric trim nor the autopilot may be used.
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