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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).
510OM-00 16-41
CITATION MUSTANG OPERATING MANUAL
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.
16-42 510OM-00
CITATION MUSTANG OPERATING MANUAL
RH30L ??
GA AP YD GA
NAV1 111.90 114.10 ??? SURNE DOS 4.6NM BRG 303°
113.80 110.90
SJC
NAV2 ISJC
118.200 COM1
136.975
136.975
118.000 COM2
20
10
20
10
10 10
4
4
2
2
-900
2500
2400
2300
2100
2200
2000
29.92IN
HDG 276° CRS 303°
22 80
60
21
S
15
12
E
6
3
N
33
30
W
24
LOC2
RAT 0°c ISA +0°c
306°
G
80
130
120
110
100
90
4000
103 4
2
XPDR1 1263 ALT R LCL 10:34:16
GO-AROUND MODE ACTIVE
AUTOPILOT
DISCONNECT
ANNUNCIATION
FLASHES
AMBER 5 SEC
COMMAND BARS
INDICATE CLIMB
Figure 16-43. Go-Around Mode
ROL CWSYD PIT ALTS
CONTROL WHEEL STEERING
Figure 16-41. CWS Display
Figure 16-42. GA Switch
OPERATION
Emergency Descent Mode
The AFCS has an emergency descent mode
(EDM) that enables the AP, when pressurization
is lost, to automatically descend the aircraft
to 15,000 feet at VMO/MMO, regardless
of pilot physiological condition (Figure 16-44).
The aircraft must be above 30,000 MSL for
EDM to arm. To exit EDM, disconnect the AP.
If the AP is engaged, and the onboard cabin
pressure sensors detect a cabin altitude greater
than 14,500 feet, the AP automatically enters
EDM, and displays EDM (white letters in a red
box) on the PFDs.
During EDM, the AFCS:
• Selects HDG mode and sets heading
(heading bug on the PFD HSI) to 90° left
of the current heading
• Selects FLC mode, 0.63 m and sets altitude
preselect (altitude bug on the PFD
altitude display) to 15,000 feet
To enable the maximum possible descent rate
when in EDM, the pilot should immediately:
• Reduce throttles to IDLE
• Extend speedbrakes
AUDIO PANEL
DESCRIPTION
The Mustang avionics system includes an audio
panel for each crewmember (pilot and copilot).
The audio panels are visible as vertical switch
panels on the instrument panel immediately
outboard of each PFD. Each audio panel includes
an audio amplifier, a marker beacon receiver,
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CITATION MUSTANG OPERATING MANUAL 2(30)
