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sensor can activate the message. The CABIN
ALT message is either red, amber, or white depending
on specific conditions.
In flight, the red CABIN ALT message appears
when the cabin altitude is above a maximum
of 10,000 feet, except when the pressurization
system is set for high-altitude mode.
NOTE
High altitude mode changes these
indications. (Refer to High Altitude
Mode later in this chapter.)
However, any time the aircraft is in flight
above an actual altitude of 25,000 feet, if the
cabin altitude rises above 10,000 feet, the red
CABIN ALT message appears. The message
disappears when cabin altitude descends below
8,300 feet.
In flight, the red CABIN ALT message also appears
any time the cabin altitude is above approximately
15,000 feet. The message
disappears when cabin altitude descends below
11,000 feet.
If the aircraft is on the ground, as indicated by
a squat switch, the CABIN ALT message is not
displayed, regardless of cabin altitude (except
during the rotary test procedure). During
rotary test, when the rotary TEST knob is rotated
to the CABIN ALT position, the amber
and red CABIN ALT messages both appear in
the CAS display.
PRESS OFF
The white PRESS OFF message indicates that
the AIR SOURCE SELECT knob is set to OFF
or FRESH AIR, either of which stops pressurized
air inflow to the cabin. The cabin slowly
depressurizes (due to normal cabin leakage)
until pressure is equalized between cabin and
outside air. At this point, if FRESH AIR is selected,
the fresh-air duct opens and a fan injects
unpressurized outside (fresh) air into the
aircraft.
PRESS CTRL
The white PRESS CTRL message indicates
failure of the ARINC 429 data link from the
G1000 system, indicating that the controller
may no longer have valid data on outside air
pressure, actual aircraft altitude, or selected
destination elevation.
CITATION MUSTANG OPERATING MANUAL
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CITATION MUSTANG OPERATING MANUAL
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The amber PRESS CTRL message indicates
failure of the pressurization controller or that
the pilot has selected the PRES CONT switch
to STANDBY, disabling the pressurization
controller.
If the message is amber, the pressurization
controller no longer has valid control of the
outflow valves, and the climb and dive solenoid
valves close. The system begins to operate
in pneumatic mode. 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).
If aircraft actual altitude rises high enough to
exceed 8.6 psid, the maximum cabin differential
valves open and the cabin altitude increases
as needed to maintain 8.6 psid. If
aircraft actual altitude descends to the cabin
altitude, the outflow valves open allowing
outside air to enter the cabin, which equalizes
cabin altitude with actual altitude.
OPERATION
The AIR SOURCE SELECT knob provides
limited control of incoming air pressure from
the engine bleed-air system. For pressurization,
the control must be set to receive bleed air
from an operating engine (L, R, or BOTH).
All functions of this control are detailed in
Chapter 11—“Air Conditioning.”
Pressurization also may be controlled manually
with the CABIN DUMP switch if DC or
EMER power is available.
GROUND/FLIGHT MODES
Cabin pressure is maintained by controlling
the outflow of air from the pressure vessel.
A maximum cabin differential pressure of 8.6
psid is permitted for the pressure vessel. The
maximum cabin pressure differential allowed
by limiters on the outflow valves is 8.5 ±
0.1 psid. Squat switches and engine throttle
lever settings are used to define four operating
modes:
• Ground/taxi mode
• Prepressurization mode
• Flight mode (including high altitude
mode)
• Pneumatic mode
Ground/Taxi Mode
On the ground (as detected by a squat switch)
with both engines operating below CRU throttle
settings (approximately 85% N2), both outflow
valves are kept fully open. This equalizes
the pressure between cabin and ambient air,
makes opening doors easier, and avoids pressure
bumps when doors are opened.
Prepressurization Mode
When either engine is set to the CRU throttle setting
or higher (greater than approximately 85%
N2) on the ground, both outflow valves slowly
restrict to bring cabin pressure difference to a
maximum of 200 feet below field altitude. This
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