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Pressurization Readouts (automatic mode)
Comes on when pressurization system is
operated in automatic mode:
C ALT -- Displays current cabin altitude.
Rate -- Displays rate of climb or descent in feet
per minute and direction via arrow symbol.
DP -- Displays cabin to ambient differential
pressure.
LDG ELEV -- Displays elevation in feet as set
at LDG ELEV selector.
AUTO PRS 1/2 FAIL status (white)
Indicates loss of active channel in
manual mode.
CABIN ALT WARN HI status (white)
Indicates that landing elevation is set
above 8000 feet.
Status Page
OUTFLOW VLV OPEN status (white)
Indicates outflow valve in full open
position.
OVBD COOL FAIL status (white)
Indicates that the ground valve
has failed CLOSED on the ground.
Vol. 1 08--60--8
ENVIRONMENTAL CONTROL SYSTEM
Pressurization System REV 3, May 03/05
Flight Crew Operating Manual
CSP C--013--067
2. CABIN PRESSURE CONTROLLERS
The aircraft is equipped with dual, redundant controllers, which operate only in automatic
mode. All controller outputs are sent to the outflow valve. While one controller is in use, the
other updates automatically. The active cabin pressure controller commands the outflow
valve to a nominal differential pressure of 8.33 psid. Normally, inputs to the pressure
controllers are supplied from air data computer 1 (ADC 1). ADC 2 is the backup to ADC 1.
If a controller fails, the system will automatically switch over to the other controller. If
automatic switch--over fails, select the PRESS CONTROL switch twice. This will enable the
redundant controller. If both pressure controllers fail, both outflow valves will go to an
isobaric hold mode. When the airplane is on the ground for 3 minutes, automatic pressure
controller switch--over will occur.
The pressurization system automatically maintains cabin pressure through all phases of
flight. Typical values used in the cabin/flight altitude schedule during manual mode are as
follows:
AIRPLANE FLIGHT ALTITUDE (feet) CABIN PRESSURE ALTITUDE (feet)
10 000 --200
15 000 600
20 000 1500
25 000 2700
30 000 4200
35 000 6000
41 000 8000
A. Automatic Pressurization Modes
S Ground mode: Both the outflow valve and ground valve are driven full open.
S Pre-Pressure mode: When thrust levers are advanced to take-off, the cabin
pressure moves towards the scheduled cabin pressure with a pressure rate of
change equal to 300 ft/min, limited at a differential pressure of 150 ft/min. During
take-off without air-conditioning, the outflow valve and ground valve are driven
closed.
S Take-Off abort mode: When the thrust levers are retarded to idle, the cabin ascends
at approximately 500 ft/min for 20 seconds, then the outflow valves are driven full
open.
S Climb mode: Cabin climb is in accordance with a fixed schedule, cabin altitude vs
airplane altitude. The climb rate varies between approximately 500 and 800 ft/min,
dependant on the airplane climb speed. The controller compares selected landing
elevation to the climb schedule, then selects the highest pressure schedule.
S Flight abort mode: When the airplane has maintained an altitude of up to 6,000 feet
above the take-off field altitude for 10 minutes, and then has initiated a descent of
1,000 ft/min, the system will then assume the elevation for the departing airport,
regardless of the pre-selected landing elevation.
Vol. 1 08--60--9
ENVIRONMENTAL CONTROL SYSTEM
Pressurization System Sep 09/02
Flight Crew Operating Manual
CSP C--013--067
S Descent mode: The cabin full descent schedule occurs when the airplane is in
descent. Cabin altitude decreases at approximately 300 to 750 ft/min, to either
landing elevation, or maximum differential, whichever is highest. When the landing
elevation exceeds 8,000 feet, cabin altitude will be maintained at maximum
differential, until the airplane descends, then the cabin altitude will rate up to the
pre-selected landing elevation.
S Landing mode: The cabin altitude is driven below field elevation or the airplane is
unpressurized. When the cabin is below field elevation, then the cabin is rated up at
approximately 600 ft/min for 30 seconds, then the outflow valve is driven full open.
S Touch and Go mode: On airplane touchdown, the system will assume landing
mode; as the thrust levers are advanced, the system will schedule pre-pressure
mode.
B. Manual Pressurization Modes
S UP selection: Cabin ascends at selected rate of 150 (±150) to 3,000 (±500) fpm.
When the desired cabin altitude is reached, select MAN ALT to HOLD position.
S DN selection: Cabin descends at selected rate -100 (±100) to -2,500 (±500) fpm..
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