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3 NAV Key Selects/deselects Navigation Mode.
4 FD Key Activates/deactivates the flight director only. Pressing once turns on the pilot-side flight director
in the default vertical and lateral modes.
Pressing again deactivates the flight director and removes the command bars. If the autopilot is
engaged, the key is disabled.
5 XFR Key Transfers between the active flight director and standby flight director.
6 ALT Key Selects/deselects Altitude Hold Mode.
7 VS Key Selects/deselects Vertical Speed Mode.
8 FLC Key Selects/deselects Flight Level Change Mode.
9 CRS Knobs Adjusts the Selected Course in 1° increments on the HSI of the corresponding PFD.
and Press to center the course deviation indicator and return the course
17 pointer directly to the bearing of the active waypoint/station.
10 SPD Key Toggles Airspeed Reference between IAS and Mach for Flight Level Change Mode.
11 NOSE UP/DN Wheel Adjusts the reference in Pitch Hold, Vertical Speed, and Flight Level Change Modes.
12 VNV Key Selects/deselects Vertical Path Tracking Mode for Vertical Navigation flight control.
13 ALT SEL Knob Controls the Selected Altitude in 100-ft increments (the Baro minimum altitude is also available).
14 YD Key Engages/disengages the yaw damper.
15 AP Key Engages/disengages the autopilot.
16 BANK Key Selects/deselects Low Bank Mode.
18 BC Key Selects/deselects Backcourse Mode.
19 HDG Knob Adjusts the Selected Heading and bug in 1° increments on the HSI (both PFDs). Press to
synchronize the Selected Heading to the current heading.
Table 16-8. AFCS CONTROLLER DESCRIPTIONS
The pilot commands AP engagement/disengagement
with the AP key on the AFCS controller.
Various controls on the yokes and
throttles will also disengage the AP. FD can
be selected using the FD key.
AFCS indications appear at the top of the PFD
below the navigation status box (Figure 16-37).
This status box contains information about
the current status of the AFCS, including
whether FD,AP, or YD are active, which guidance
mode the AFCS is currently following,
and which target values are being observed.
Flight Director
The AFCS FD function causes magenta command
bars to appear on the PFDs, which indicates
the attitude required to correctly
navigate the selected horizontal and/or vertical
flight path. The pilot maneuvers the aircraft
to maintain the delta symbol on the PFD as
closely as possible to the underside of the
command bars.
Each GIA has a FD; one is active and the other
is standby. The active FD is selected with the
XFR key.
The active FD analyzes the selected flight
profile and compares it to current aircraft position.
It then computes such functions as attitude,
heading and roll rate as necessary to
maneuver to the selected flight path. Using
these calculations, the active FD moves the
command bars on both PFDs.
FD commands are limited to:
• Pitch—±20°
• Vertical acceleration—0.1g
• Bank angle—30°
• Bank Rate—5°/second
Autopilot
The AP maneuvers the airplane to follow the
FD by providing signals to the four flightcontrol
servos, which are:
• Pitch
• Roll
• Yaw
• Pitch trim
Yaw Damper
The YD stabilizes the aircraft in flight to prevent
yaw instability. It can be engaged independently
of the AP.
The YD must be selected off during takeoff and
landing.
CONTROLS AND INDICATIONS
The AFCS is manipulated by various knobs and
keys on the controller and by additional controls
on the yoke and throttles.
AFCS Status Box on PFD
The AFCS status box indicates the settings and
status of active and pending AFCS functions:
• White—Armed modes
• Green—Active modes
• Amber (flashing)—Canceled modes
• Red (flashing)—Abnormal AP
disconnect
AFCS Controller
The AFCS controller is at the top of the instrument
panel, above the MFD. It contains controls
for the FD,AP, YD, and for making associated
settings or selections on the PFDs (including
16-40 510OM-00
CITATION MUSTANG OPERATING MANUAL
ROL AP YD PIT ALTS
Figure 16-37. Automatic Autopilot
target headings, courses, altitudes, vertical
speeds, and airspeeds). The pushbutton keys are
momentary-contact on/off toggle switches.
Most keys and knobs affect both FD and AP
functions. However, the FD and AP keys select
or deselect all FD and AP operation.
On the right side of most keys on the AFCS
controller, small white LEDs indicate when
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