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digits are dashed out.
In reversionary mode or emergency power
mode, the pressurization display (Figure 12-5)
is limited to three lines showing:
• The label CABIN PRESS,
• Cabin altitude (ALT FT with digital
readout), and
• Cabin differential pressure (DIFF PSI
with a digital readout).
Cabin Altitude: ALT FT
Cabin pressure altitude (in feet) is indicated
under the label “ALT FT,” on a vertical analog
display and a digital readout. In reversionary
mode or emergency power mode, only
the digital readout appears. When the aircraft
CITATION MUSTANG OPERATING MANUAL
510OM-00 12-7
is on the ground, the digital readout does not
appear and the analog display bar is all green.
The analog display scale pointer when the
controller is in normal mode is:
• Red above 10,000-foot cabin altitude
• Amber between 8,500- and 10,000-foot
cabin altitude
• Green below 8,500-foot cabin altitude
The analog scale labels are white and the
pointer changes color depending on the color
range to which it is pointing.
If the system detects cabin altitude beyond
the limits of the display (0–15,000 feet cabin
altitude), the pointer goes to the appropriate
end of the scale and points away from the center.
If the system has invalid data, a red “X”
replaces the digital readout. If both squat
switches indicate the aircraft is on the ground,
the digits disappear.
Cabin Altitude Rate-of-Change:
RATE FPM
Cabin pressure altitude rate-of-change (in feet
per minute) is normally indicated under the
label “RATE FPM” on a vertical analog display
and a green pointer and digital readout. This
indication reports the rate of change of cabin altitude,
not actual aircraft vertical speed. In reversionary
mode or emergency power mode,
this indication does not appear on the pressurization
display,
The analog scale and its markings are white, and
the pointer is green. The scale is marked at:
• +1 (1,000 fpm cabin climb rate)
• 0 (cabin altitude not changing)
• –1 (1,000 fpm cabin descent rate)
If cabin rate exceeds the range of the analog
scale, the pointer goes to the appropriate end
of the scale and points away from center. If the
system has invalid data, a red “X” is displayed.
The cabin rate on the ground is zero (0), except
during prepressurization.
Destination Elevation: DEST
ELV
In normal display mode, the altitude of the destination
airport (in feet), as selected by the
pilot, is indicated by a digital readout in front
of the white label “DEST ELV.” In reversionary
mode or emergency power mode, this data
is not displayed on the pressurization display,
but can always be accessed through the
TMR/REF menu on the PFD.
The DEST ELV digits are cyan and may be set
to any altitude between –1,000 and 14,000 feet.
This setting is retained by the G1000 system
when the aircraft is powered off. When the
aircraft is powered on again, the value from
the previous flight remains set in the system
until changed by the pilot.
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12-8 510OM-00
Figure 12-5. Pressurization Display
(Reversionary Mode)
Cabin Differential Pressure:
DIFF PSI
The cabin differential pressure indication is at
the bottom of the pressurization display, labeled
“DIFF PSI.” It indicates the difference (in psid)
between cabin pressure and outside air pressure.
Normally, it is displayed as a horizontal
analog display and digital readout. In reversionary
mode, only the digital readout appears with
the DIFF PSI label. (If all air data is lost, a red
“X” replaces the digital readout.)
The scale and pointer are green below 8.6 psid
and red at 8.6 psid or higher. If pressure reaches
8.6 psid or higher, the digital readout and
pointer turn red. Maximum cabin pressure differential
(maximum Delta-P) valves automatically
prevent this from happening.
If cabin differential pressure is less than 0.2
psid, 0.0 psid is displayed.
CAS MESSAGES
Three CAS messages (in different colors, depending
on conditions) provide information on
the pressurization system:
• CABIN ALT (unsafe cabin altitude)
• PRESS OFF (pressurization air inflow
is shut off)
• PRESS CTRL (pressurization controller
is disabled)
CABIN ALT
The CABIN ALT message indicates an unsafe
cabin altitude. The message is controlled by
inputs from two cabin pressure sensors. Either
　
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