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• VNAV TARGET ALTITUDE—As preset
by the pilot, that altitude in MSL to
be reached by flying a programmed vertical
speed.
• VERTICAL DEVIATION INDICATOR—
This symbol indicates deviations
from the correct flight path; thereby allowing
the pilot (or AFCS) to make adjustments
in pitch, as required, to
maintain the selected vertical profile.
• REQUIRED VERTICAL SPEED—The
vertical speed rate required to achieve
the preselected altitude within that distance
defined by the programmed flight
plan.
For more information on vertical navigation,
refer to the Garmin manuals and guides supplied
with your Citation Mustang.
AUTOMATIC FLIGHT
CONTROL SYSTEM
DESCRIPTION
The Mustang includes an AFCS that provides
flight guidance and automatic flight control.
The automatic flight control system includes
three primary functions:
• Flight director
• Autopilot
• Yaw damper
• Manual electric pitch trim
The AFCS controller (above the MFD) provides
control of these functions, and the PFDs
provide necessary indications (Figure 16-36
and Table 16-8). Computers for these functions
are in the GIAs and the servos. If either
GIA fails, the other GIA performs the FD
functions. If both GIAs fail, the AFCS is not
operational.
The FD and AP follow the same sources of
data for AFCS guidance. If AP is engaged, the
information is used to control the airplane. If
the FD is engaged, the information is used to
guide the pilot.
510OM-00 16-37
CITATION MUSTANG OPERATING MANUAL
3600
4
4
2
2
13400
0
13300
13200
13000
12900
131
20
80
00
V
-1250
29.92IN
VNAV
TARGET
ALTITUDE
REQUIRED
VERTICAL
SPEED
VERTICAL
DEVIATION
INDICATOR
Figure 16-35. VNAV Indications
16-38 510OM-00
CITATION MUSTANG OPERATING MANUAL
1 2 3 4 5 6 7 8
19 18 17 16 15 14 13 12 11 10 9
Figure 16-36. AFCS Controller
510OM-00 16-39
CITATION MUSTANG OPERATING MANUAL
# CONTROL DESCRIPTION
1 HDG Key Selects/deselects Heading Select Mode.
2 APR Key Selects/deselects Approach Mode.
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
　
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