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data link is restored, the CAS message disappears,
and the controller recognizes the currently
entered DEST ELV as indicated on the
EICAS display.
Pneumatic Mode
The pressurization controller goes into
standby mode if the controller detects an internal
fault or the PRESS CONT switch is set
to STANDBY. An amber PRESS CTRL message
appears on the MFD to advise the pilot
the pressurization system is in standby mode.
In level flight the outflow valves maintain
the cabin altitude. The outflow valves cause
the cabin altitude to move opposite the direction
of aircraft movement; if the aircraft
climbs, the cabin dives and vice versa. As the
aircraft climbs, the cabin altitude decreases
until stopped by maximum differential pressure
limiter valves. As the aircraft descends,
cabin altitude increases until stopped by the
maximum altitude limit valve (14,300 ± 300
feet). The pilot cannot control cabin altitude
except by dumping the cabin with the CABIN
DUMP switch.
In pneumatic mode, pressure is trapped in the
mixing section of the outflow valves. As the
aircraft climbs, the diaphragm expands and
closes off a larger portion of the outflow area,
causing the cabin altitude to descend. As the
aircraft descends, the diaphragm contracts
and opens a larger portion of the outflow area,
causing the cabin altitude to climb. In either
case, the maximum altitude limiters and the
maximum cabin differential limiters prevent
the aircraft from passing through cabin pressure
safety limits when the aircraft is operated
within the aircraft operating limitations as defined
in the AFM.
SETTING DESTINATION
ELEVATION
The pilot sets the destination elevation through
the TMR/REF softkey on the pilot PFD by
using the following procedure:
1. Push TMR/REF softkey on the PFD.
2. The reference window appears on the
PFD screen.
3. Use the large FMS knob to select DEST
ELV.
4. Use small FMS knob to change number.
5. Press ENT button to accept the entered
destination elevation.
HIGH-ALTITUDE AIRPORT
OPERATION (AUTOSCHEDULE)
High-Altitude Landings
When the aircraft is to land at an airfield between
8,000 and 14,000 feet, certain conditions
must be met before the controller automatically
switches into the high-altitude mode. The required
conditions are as follows:
• Selected landing altitude is greater than
8,000 feet.
• G1000 data indicates aircraft altitude
is between 8,000 and 25,000 feet.
• Aircraft descends 500 feet from maximum
altitude (as determined by controller
static sensor and GIA).
If the above conditions are true, then high altitude
airport mode is initiated. When landing
at a high altitude airport, cabin pressure altitude
does not exceed 8,000 feet before the
aircraft altitude descends below FL 245. Upon
descending past FL 245, the cabin altitude
climbs at the increased climb rate, until the selected
landing altitude is reached.
CITATION MUSTANG OPERATING MANUAL
12-12 510OM-00
CITATION MUSTANG OPERATING MANUAL
510OM-00 12-13
High-Altitude Departures
When the aircraft departs from an airfield between
8,000 and 14,000 feet, a different set
of conditions must be met before the controller
can switch into the high-altitude mode.
The required conditions are as follows:
• Weight on wheels
• G1000 data indicates aircraft altitude
is greater than 8,000 feet
• Cabin altitude is greater than 8,000 feet
High-Altitude CABIN ALT
Message
When the conditions for high-altitude departures
or landings are met, the color of the
CABIN ALT message changes to:
• White, with a cabin altitude between
10,000 feet and 15,000 feet for not more
than 30 minutes.
• Amber, with a cabin altitude between
10,000 feet and 15,000 feet for more
than 30 minutes.
• Red, if cabin altitude is at or above
14,800 ± 200 feet.
• Red, if cabin altitude is at or above
10,000 feet and the aircraft altitude is
above 25,000 feet.
Annunciation is inhibited on the ground and
during takeoff and landing.
High-Altitude Ranges for
Pressurization Display
When in high-altitude mode, the color bands
on the pressurization analog display change
from their normal ranges to ranges appropriate
for high-altitude operations (Figure 12-6).
The analog display scale when the controller
is in high altitude mode are:
• Red above 14,600-foot cabin altitude
• Amber between 14,000- and 14,600-foot
　
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