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CABIN
AFT PRESSURE
BULKHEAD
TAIL CONE
controls, except the maximum cabin altitude
limit valves, and are not dependent upon any
other system, nor any control.
CONTROLS AND
INDICATIONS
All pressurization system controls are on the
ENVIRONMENTAL panel immediately to the
right of the throttle quadrant (Figure 12-3), except
for DEST ELV settings (which are selected
through the PFD softkeys). Indications
on the EICAS in the CABIN PRESS display
(Figure 12-4) and CAS messages indicate the
conditions and performance of the pressurization
system. CAS messages warn the pilot
of abnormal and emergency situations.
PRESSURIZATION
CONTROLLER
The pressurization controller has two modes of
operation, normal and high altitude. Depending
on aircraft altitude and various factors, the controller
commands appropriate auto schedules as
needed. In response to ambient air data from the
aircraft avionics system, and settings by the
pilot, the controller regulates cabin pressure by
electrical signals to the climb and dive solenoid
valves (see Figure 12-1). The pressurization
controller maintains an 8,000-foot cabin
altitude up to 41,000 feet with a cabin pressure
differential of 8.3 psid (± 0.1).
The pressurization controller has a built-in
schedule that automatically
• Controls cabin altitude based on aircraft
altitude
• Adjusts cabin rate of climb/descent versus
aircraft rate of climb/descent
• Adjusts for destination elevation as selected
by the pilot
CITATION MUSTANG OPERATING MANUAL
12-6 510OM-00
Figure 12-3. Pressurization Controls
ALTITUDE
RATE
CABIN
ALTITUDE
CABIN
ALTITUDE
(DIGITAL)
ALTITUDE
RATE
(DIGITAL)
DIFFERENTIAL
PRESSURE
DESTINATION
ELEVATION
DIGITAL DIFF PSI
Figure 12-4. Standard (MFD)
Pressurization Display
The controller receives air data information
from air data computers through the G1000
Garmin Interface Adapter (GIA) No. 1.
DESTINATION ELEVATION
SETTING
The pilot sets the destination elevation through
controls on either G1000 PFD, using the
TMR/REF softkey, FMS knobs, and ENT butt
o n . The procedure is described in the
Operation section.
PRESS CONT (STANDBY—
NORM) SWITCH
The PRESS CONT switch on the PRESSURIZATION
subpanel of the ENVIRONMENTAL
control panel (see Figure 12-3) selects the
mode of operation in flight. When NORM is
selected, the pressurization controller automatically
functions to control cabin altitude in
flight mode. When the pilot selects STANDBY,
pressurization operates in a pneumatic backup
mode in flight. With the PRESS CONT switch
in either position, the CABIN DUMP switch
remains functional.
MANUAL CABIN DUMP SWITCH
The CABIN DUMP switch on the PRESSURIZATION
subpanel (see Figure 12-3) can be
manually actuated at any time DC or EMER
power is available to reduce cabin pressure.
The switch relieves cabin pressure by energizing
the climb solenoid valve open, which releases
regulated air from the outflow valve
control chambers. This retracts the outflow
valve diaphragms, opening the outflow valves,
and releases pressure from the cabin.
The maximum cabin altitude limit valves override
the climb solenoid valves to prevent cabin
depressurization above 14,300 ± 300 feet altitude.
The cabin dump system requires DC
power. The switch and associated climb solenoid
are powered by the emergency bus.
Circuit protection for the CABIN DUMP is on
the right CB panel in the ENVIRO grouping
labeled “CABIN DUMP” (see Figure 12-1).
The CABIN DUMP switch is protected from
accidental operation by a red guard. To operate
the switch, lift the red guard and press and
release. The switch is a latching switch. When
pressed, the lighted switch indication changes
from NORM to DUMP. Pressing again restores
the switch back to NORM.
PRESSURIZATION DISPLAY
The pressurization display is labeled CABIN
PRESS, and normally appears on the lower second
column of the EICAS on the MFD (see
Figure 12-4). It indicates:
• The label “CABIN PRESS”
• Cabin altitude (ALT FT)
• Cabin altitude rate-of-change (RATE
FPM)
• Destination elevation (DEST ELV)
• Cabin differential pressure (DIFF PSI)
If any indication is disabled by invalid data,
a red “X” replaces that specific indication. If
the data is out of range of a digital readout, the
　
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