User manual

60 61
60 61
Vertical Trim switch on the Mode Controller may also be used to adjust
the selected pitch attitude up or down at approx. 1 degree/second.
Special note: The FD mode must be activated before the Autopilot
can be engaged.
AUTOPILOT Engagement
The AUTOPILOT is engaged by moving the AP toggle switch on the
Mode Controller to the ON position. Note that the AP and the YAW
DAMP (YD) switches are wired so that the YAW DAMP mode is auto-
matically engaged with the AP switch. The Autopilot, together with
the Yaw Damper, provides three-axis stabilization, automatic turn coor-
dination and automatic elevator trim as well as automatic response to
all selected Flight Director commands.
Caution: When the autopilot is engaged, manual application of a
force to the pitch axis of the control wheel for a period of 3 seconds
or more will result in the autotrim system operating in the direction
to create a force opposing the pilot. This opposing mistrim force will
continue to increase as long as the pilot applies a force to the control
wheel and will ultimately overpower the autopilot. If the autopilot is
disengaged under these conditions, the pilot maybe required to exert
control forces in excess of 50 pounds to maintain the desired aircraft
attitude The pilot will have to maintain this control force while he
manually retrims the aircraft.
Caution: Prior to Autopilot engagement, the pilot should make sure
the V-bar commands are satisfied. This will prevent any rapid changes
in the aircraft’s flight path when the Autopilot is engaged.