Figure 3-23. Autopilot Pitch-Turn Control Panel
ALT annunciator. Illuminates when
altitude hold mode is selected.
AP DISC annunciator. Illuminates
when autopilot is disconnected.
AP ENG annunciator. Illuminates
when autopilot is engaged.
IAS annunciator. Illuminates when
airspeed hold mode is selected.
HDG annunciator. Illuminates when
heading mode is selected.
LIN DEV. Not Applicable
Go-around switch (control pedestal, fig. 2-8).
When pressed, autopilot disconnects, GA annunciator light
illuminates, and flight director indicator commands wings
level, 7° nose up attitude. Autopilot may be re-engaged to
follow the go-around command.
Controls and Functions, Autopilot pitch-turn panel
Turn control knob. Supplies roll commands
to autopilot. Spring loaded to center detent.
Pitch control thumbwheel. Supplies pitch
commands to autopilot. Spring loaded to center detent.
Controls and Functions. (fig. 2-17).
DISC TRIM AP YD pushbutton. When pressed
to the first detent, autopilot system and yaw damp are
disconnected. When pressed to second detent, electric trim is
PITCH SYNC & CWS pushbutton. This button
may be used instead of the pitch-turn control to establish the
aircraft in a desired attitude. Depressing the button causes
the autopilot servos to disengage from the control surfaces,
enabling the pilot to manually fly the aircraft to the desired
attitude until button is released.
Turn-on procedure: Power is applied to the system
anytime the aircraft avionics bus is energized.
Autopilot Modes of Operation:
Attitude mode. The autopilot is in the attitude
mode when the ENG-DIS switch (autopilot mode selector
control panel) is in the ENG position and no mode selector
switches (HDG, NAV, etc.) have been selected (fig 3-20).
The autopilot will fly the aircraft and accept pitch and roll
rate commands from the autopilot pitch-turn panel (fig. 3-
Guidance mode. When the autopilot is in the
attitude mode and a mode selector switch (HDG, NAV, etc.)
is pressed, the autopilot is