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CAS Color Description
CAB DELTA P Amber Cabin differential pressure limit (either positive
or negative) is exceeded.
CAB PRESS FAIL Amber Both channels (L and R) of the cabin pressurization
control system have failed. System
pressurization will go to maximum differential
pressure and cabin pressurization displays
will become amber dashes.
CAB PRESS MAN Amber Cabin pressurization has reverted to manual
rate mode because of the loss of all air data
input (dual ADC failure).
CAB PRESS FAIL White Associated channel (L or R) of the cabin
pressurization control system has failed. System
operation will automatically switch to the
opposite channel.
CAB PRESS MAN White Cabin pressurization manual rate mode is
selected by the crew.
Pilot’s Manual
6-30 PM-126A
Emergency pressurization is provided by two independent channels
(primary and secondary) of the cabin pressure controller. If triggered
automatically, the primary and secondary channels will activate approximately
at the same time in response to the cabin pressure controller.
If triggered manually, the primary and secondary channels may be
activated separately. When automatic or manual emergency pressurization
is triggered, the following events occur:
- EMER PRESS switch illuminates ON.
- EMER PRESS ON amber CAS illuminates.
- Emergency pressurization valves open.
- The HP bleed-air shutoff valves close.
Extended operation with emergency pressurization will increase cabin
temperature, especially at higher thrust settings. Temperature control
will only be possible by reducing thrust or turning an L or R BLEED
switch OFF. At altitudes not requiring pressurization, both L and R
BLEED switches can be selected OFF.
Once cabin pressure has been restored by EMER PRESS activation, or
after descent, the cabin pressure controller will automatically reset the
emergency pressurization system at 8300 or 13,300 feet, depending on
the triggering altitude (9500 or 14,500 feet). Depressing the EMER
PRESS switch when the cabin altitude is below 8000 feet will extinguish
the switch and CAS, and restore normal pressurization.
The following CAS illumination is specific to the emergency pressurization
system:
PRESSURIZATION CONTROLS AND INDICATORS
CABIN PRESSURIZATION CONTROL DISPLAY
The cabin pressurization control display on the PRESSURIZATION
panel includes an LCD (liquid crystal display) for presenting CAB
RATE (cabin rate), DELTA P (differential pressure), CAB ALT (cabin altitude),
manual cabin, and landing field elevations.
LDG ALT KNOB
The LDG ALT rotary knob is used to select landing field elevation during
automatic pressurization mode. Rotation of the knob illuminates an
LA and displays the present landing field altitude for 5 seconds. The rotary
knob adjusts the landing altitude DN or UP in 100-foot increments
per detent.
CAS Color Description
EMER PRESS ON Amber The associated (L or R) emergency pressurization
valve is open (manually or automatically).
Pilot’s Manual
PM-126A 6-31
MANUAL PRESS SWITCH AND MANUAL KNOB
Manual control of the pressurization system is initiated by pressing the
MANUAL PRESS switch ON. In the event of a dual ADC failure, manual
mode is automatically initiated.
The MANUAL rate knob allows the crew to control how fast the cabin
pressurization system reaches the desired cabin altitude. Rotation of
the knob illuminates an MR and displays the present manual rate temporarily.
The rotary knob adjusts the manual pressurization rate DN or
UP in 100 foot-per-minute increments per detent. When the desired
cabin altitude is approached, rotate the manual control knob in the appropriate
direction until the manual cabin rate reaches zero.
EMER DEPRESS SWITCH
The EMER DEPRESS switch is an alternate-action switch located on the
PRESSURIZATION panel. A guard is installed over the switch to
prevent inadvertent actuation. The switch is used to depressurize the
cabin and increase cabin airflow for smoke and fume evacuation. The
EMER DEPRESS function is available in both automatic and manual
modes. When EMER DEPRESS is selected ON, a EMER DEPRESS
white CAS illuminates and the outflow valves receive a signal to move
toward the full open position. The cabin altitude will ascend to the
aircraft altitude or 13,700 (±500) feet (cabin altitude limiter), whichever
is less. To de-select this mode, depress and release the EMER DEPRESS
switch.
The following CAS illumination is specific to the emergency depressurization
system:
CAS Color Description
EMER DEPRESS White Emergency depressurization is selected by
　
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