ELECTRIC ELEVATOR TRIM AND AUTOPILOT/FLIGHT
Pilot's and copilot's PITCH TRIM switches - Press to
NOSE UP and NOSE DN positions, singularly and in
pairs. Check that trim wheel moves in proper direction
and operates only when trim switches are pressed in
pairs. Any deviation requires that electric elevator trim
be turned off and flight conducted using manual trim.
DISC TRIM switch - Press to second detent and verify
annunciator light (in pedestal) extinguishes.
Flight director (FDI) and Radio Magnetic Indicator (RMI)
warning flags - Check masked.
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
operation, then return them to the center
Autopilot mode selector panel - Select HDG mode.
Horizontal Situation Indicator (HSI) - Set heading
marker under lubber line.
Autopilot - Engage Check that controls are stiff and that
AP ENG, HDG, and AIL HI TORQUE annunciator lights