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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
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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
the key is selected on, and the corresponding
function is active or enabled (Figures 16-38
and 16-39).
Control Yoke Switches
On each control yoke, three switches control
various AFCS functions, particularly disabling
the AP, and returning manual flight control to
the crew (Figure 16-40):
• DOWN–UP trim switches—When operated
to adjust pitch, trim also disengages
the AP.
• AP TRIM DISC switch—Immediately
disconnects both the AP and the YD.
• CWS (control wheel steering) switch—
Momentarily disengages the AP and synchronizes
the FD command bars with
the current aircraft pitch (if not in glide
slope or vertical navigation mode) and
roll (if in roll hold mode). A CWS button
is on each control wheel. Upon release
of the CWS button, the FD may
establish new reference points, depending
on the current vertical and lateral
modes. The CWS display presents in
the AFCS status box (Figure 16-41).
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GPS ROL AP YD VS 100FPM ALTS VPTH
LATERAL MODES
VERTICAL
MODES
YAW DAMPER
STATUS
AUTOPILOT
STATUS
ARMED
ARMED
MODE
REFERENCE
FLIGHT DIRECTOR ACTIVE
INDICATOR ARROW
ACTIVE
Figure 16-39. AFCS Status Box
PILOT-SIDE PFD SELECTED
COPILOT-SIDE PFD SELECTED
XFR
XFR
Figure 16-38. AFCS Status Bar
Figure 16-40. Control Yoke Switches
GA Switches
On the outboard side of each throttle is a recessed
go-around (GA) pushbutton switch
(Figure 16-42). Either switch sets the AFCS
for optimum single-engine climb configuration
during a takeoff or go-around. Pressing
the GA switch:
• Disengages the AP—The pilot can
reengage the AP manually by pressing
the AP key on the AFCS. The YD remains
engaged.
• Engages the FD—Command bars appear
on the PFDs, and immediately direct
8° nose-up pitch (Figure 16-43).
• On the ground, enables takeoff mode,
which puts the command bars 10° pitch up.
During go-around mode, any attempt to modify
pitch attitude (using the CWS button or the
DN/UP thumbwheel knob) causes the AFCS
to revert to default pitch and roll modes.
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