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Vol. 1 08--60--8
ENVIRONMENTAL CONTROL SYSTEM
Pressurization System
Flight Crew Operating Manual MASTER
CSP A--013
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 aircraft altitude
at a rate of approximately 500 ft/min. The controller compares selected landing
elevation to the climb schedule, then selects the highest pressure schedule.
S Flight abort mode,
When the aircraft has maintained 6,000 feet altitude or lower 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.
S The cabin descent schedule occurs when the aircraft altitude is maintained at
0±200 feet for 10 minutes. The system pre--sets a decent rate of approximately
300 ft/min.
S The cabin full descent schedule occurs when the aircraft is in descent. Cabin
altitude decreases at approximately 300 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 aircraft
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 aircraft is unpressurized.
When the cabin is below field elevation, then the cabin is rated up at approximately
500 ft/min for 60 seconds, then the outflow valve is driven full open.
S Touch and Go mode,
On aircraft 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 50 fpm to 3,000 ±1000 fpm. When the desired
cabin altitude is reached, select MAN ALT to mid position.
S DN selection,
Cabin descends at selected rate of 50 fpm to 3,000 ±1000 fpm. When the desired
cabin altitude is reached, select MAN ALT to mid position.
S Mid selection,
Disables all previous MAN ALT selections.
Automatic mode schedules the pressurization controllers to automatically regulate the
rate of change of cabin altitude:
S Ascent from 500 ±75 fpm.
Vol. 1 08--60--9
REV 56, Jan 31/03
ENVIRONMENTAL CONTROL SYSTEM
Pressurization System
Flight Crew Operating Manual
CSP A--013
MASTER
S Decent from 300 ±75 fpm.
Manual mode rate controls are provided to manually regulate the rate of change to
cabin altitude:
S Ascent from 150 ±150 fpm to 3,000 ±500 fpm and
S Decent from 100 ±100 fpm to 2,500 ±500 fpm..
C. Differential Pressure Control
Each outflow valve has positive and negative pressure relief. The pressure controllers
normally control the cabin--to--outside pressure to 8.33 psid. The valves are preset to
open at a maximum positive differential pressure of 8.6 ±0.1 psid and at a negative
differential pressure of −0.5 psid.
D. Cabin Altitude Limitation
Altitude limit controllers within each outflow valve, operate to prevent the cabin altitude
from increasing above 14,250 ±750 feet.
E. Emergency Depressurization
Electrical signals from the EMER DEPRESS switch commands both outflow valves to
open. If the aircraft is at a cruise altitude (above 15,000 feet), the altitude limiters
operate to prevent cabin altitude from exceeding 14,250 ±750 feet.
F. Cabin Pressure Monitoring
The system uses measurements from the two cabin pressure controllers and the cabin
pressure acquisition module (CPAM) to control and monitor the system. The CPAM
supplies signals to the EICAS to display the following information:
S Cabin altitude (z)
S Cabin altitude rate of change (dz/dt)
S Cabin to ambient differential pressure (delta P)
S CPAM failure -- If a CPAM fails, the redundant controller will assume the function of
the failed CPAM (indications only)
S If the PASS SIGNS switches are selected to AUTO, the CPAM will cause the NO
SMKG and SEAT BLTS signs to come on when the cabin altitude reaches 10,000
feet
S The CPAM will automatically trigger the passenger oxygen auto deploy system
when the cabin altitude reaches 14,000 feet.
REV 56, Jan 31/03
Vol. 1 08--60--10
ENVIRONMENTAL CONTROL SYSTEM
Pressurization System
Flight Crew Operating Manual MASTER
CSP A--013
A “CABIN PRESSURE” voice alert is also provided during the following EICAS
　
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