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 TM 55-1510-218-MTF
TROUBLESHOOTING
PROCEDURE
REFERENCE
BEFORE TAXIING (CONT)
a. Flight director (FD) and radio
magnetic indicator (RMI)
warning flags - Check masked.
b. Autopilot engage switch (Au-
topilot control panel) - De-
press. Check that AP ENGAGE
and YD ENGAGE pushbuttons
flash.
c. 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.
d. Autopilot - Disengage by de-
pressing the AP ENGAGE
pushbutton.
e. Control wheel - Set to mid
travel.
f. Autopilot engage switch (au-
topilot control panel) - Depress
to engage autopilot and yaw
damper. Check that AP EN-
GAGE and YD ENGAGE
pushbuttons on the autopilot
control panel illuminate.
g. Elevator trim followup - CHECK
as follows:
(1) Control wheel - Hold aft of
mid travel. Trim wheel
should run nose down after
approximately 3 seconds.
The TRIM DN annuncia-
tor on the autopilot con-
2-30
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