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up (both AC and DC power) . If the self-test sequence is not successfully
completed, a failure will be displayed on the autopilot controller
and the autopilot will not engage. Also, an "FD" flag will be displayed
on the EADI. Flight guidance steering commands are presented
on the EADI displays. The pilot may manually fly the airplane to
satisfy the steering commands (flight director only operation) or
couple the flight guidance system to the autopilot in which case the
autopilot will respond to the steering commands.
When the autopilot isengaged and the stick shaker actuates, the autopilot
will disengage. Stick shaker has no effect on flight director operation.
AUTOPILOTCONTROLLER
The autopilot controller provides the autopilot and yaw damper engage
function, as well as autopilot/flight director mode selection and
annunciation. The controller is divided into three sections with the
center section providing autopilot/yaw damper selection and engage
buttons as well as status annunciation. The section on the left side
provides mode selection for the pilot's flight guidance system and the
section on the right side provides mode selection for the copilot's
flight guidance system. The autopilot controller is located in the center
of the glareshield and is easily accessible from either crew position.
The controller lights can be dimmed through the pilot's INSTR
dimmer switch on the pilot's dimmer panel.
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AUTOPILOT CONTROLLER
Figure S-6
Pilot's Manual
Learjet 31A
AUTOPILOT/YAW DAMPER ENGAGE FUNCTIONS
AP -TheAP pushbutton alternately engages and disengages the autopilot.
Pressing this button will couple the autopilot to the selected
flight guidance system provided the self test has successfully been
completed. A green light above the AP button will illuminate whenever
the autopilot is engaged. Engaging the autopilot will also engage
the yawdamper and flight director if not already engaged.
XFR -The XFR pushbutton alternately selects between the pilot's
and copilot's flight guidance computer for the source of autopilot
commands. Agreen arrow, on the controller, will will indicate the selected
flight guidance computer.
SOFT RIDE-TheSOFT RIDE pushbutton is used to select the autopilot
soft ride mode. When operating in soft ride mode, the autopilot
reacts more slowly to commands thus giving a smoother ride. Soft
ride is available whenever the autopilot is engaged and Approach
Capture mode is not active. A green light above the SOFT RIDE button
will illuminate whenever the soft ride mode is engaged.
YD - The YD pushbutton alternately engages and disengages the
yaw damper independently of autopilot operation. A green light
above theYD button will illuminate whenever the yaw damper is engaged-
AUTOPILOT/FUGHT DIRECTOR MODES
Autopilot and flight director modes are engaged by depressing the
applicable mode selector button on the autopilot controller. A green
light above each selector button will illuminate when that particular
mode is selected. Flight director only mode selection is accomplished
by depressing the applicable mode selector without the autopilot engaged-
Engaged autopilot and flight director modesmaybe cancelled by depressing
the selector button a second time or selecting an incompatible
mode.
Refer to the Bendix/King KFC 3100 Flight Control System Pilot's
Guide (No. 006-)8486-0000) for a detailed description and operation
of the autopilot/flight director modes.
Learjet 31A
Pilot's Manual
Attitude Hold-When the flight director is operating and no vertical
mode is selected, pitch attitude hold will automatically be active.
When the flight director is operating and no lateral mode is selected,
roll attitude hold will automatically be active . These modes are used
to maintain a reference pitch and bank angle. The reference angles
may be established by manually flying the aircraft to the desired pitch
and bank angle while depressing the CWS switch (on the control
wheel). When the CWS switch is released, the flight director will generate
commands to maintain the existing pitch and roll attitude. The
reference values may be changed using the vertical and lateral command
function of the control wheel trim switches.
HDG (heading) - When HDG is selected, commands are generated
to maneuver the airplane as necessary to fly a heading selected by position
of the heading "bug" on the EHSI.
HALF BANK -When HALF BANK is selected, the KFC 3100 control
system reduces its maximum roll attitude command to one-half of the
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