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 TM 55-1510-218-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
m.
Autopilot - Overpower in all
three individual axes, releasing
pressure on the controls after
overpowering each axis. Check
that the AP ENGAGE and YD
ENGAGE are steadily illumi-
nated.
n. Turn knob (autopilot control
panel) - Turn left then right.
Check that control wheel fol-
lows in each applied direction.
o. Pitch thumbwheel (autopilot
control panel) - Move UP then
DN. Check that elevator trim
wheel responds to pitch thumb-
wheel movements. UP TRIM
and DN TRIM annunciator
lights may illuminate.
p. Heading marker (pilot's hori-
zontal situation indicator) - Set
to aircraft heading.
q. Heading pushbutton (flight di-
rector mode selector panel) -
Depress to engage HDG mode.
r. Heading marker (pilot's hori-
zontal situation indicator) -
Move to command a turn in
the Ieft, then the right direc-
tion. Check that control wheel
moves to turn in the direction
commanded.
2-33
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