TM 55-1510-220-MTF
PROCEDURE
TROUBLESHOOTING
REFERENCE
BEFORE TAXIING (CONT)
NOTE
Since the pressure of airflow that normally opposes movement
of control surfaces is absent during preflight check, it is
possible to get a hard over control surface deflection if an
autopilot command is allowed to remain active for any
appreciable length of time. Move turn knob and pitch
thumbwheel only enough to check operation, then return them
to the center position.
d.
Autopilot mode selector panel -Select HDG mode.
e.
Horizontal Situation Indicator (HSI) - Set heading marker under lubber line.
f.
Autopilot - Engage. Check that controls are stiff and that AP ENG, HDG, and AIL HI TORQUE
annunciator lights illuminate.
g.
AIL HI TORQUE test switch - TEST. Check that AIL HI TORQUE light extinguishes.
h.
HSI heading marker - Move 10° left and right and verify that flight director and control wheels respond
in the appropriate direction.
i.
Autopilot/yaw damp disengage switch (control wheels) - Press to first detent and verify that autopilot
disengages (AP DISC
2-22
