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acquisition module (CPAM).
Corresponds to CPAM FAIL
message on status page.
EMER DEPRESS
caution (amber)
Comes on when EMER
DEPRESS switch/light operated.
MONITORED DATA (LH) ACTIVE DATA (RH)
ITEM GREEN AMBER RED WHITE AMBER
(------)
CALT
RATE
LDG ELEV
AMBER
(------)
Invalid Data
Invalid Data
Invalid Data
Invalid Data
Invalid Data
Invalid Data
Invalid Data
Monitored Data
Displayed on EICAS
Primary page (MAN)
Status page (AUTO)
Environmental Control System Page
AUTO PRESS 1, 2
FAIL status (white)
Comes on to indicate
failure of respective
controller.
Corresponds to AUTO
PRESS 1, 2 message
on status page.
Cabin/Cockpit
Altitude Readout
Displays current cabin/
cockpit altitude (in automatic
or manual mode).
Cabin/Cockpit Rate of
Change Readout
Displays rate of change in
feet per minute and direction
via arrow symbol.
Delta Pressure Readout
Displays cabin and cockpit to
ambient differential pressure.
Excursions above 8.65 psi
indicated on EICAS as DIFF
PRESS warning and CABIN
PRESSURE warning is heard.
Landing Field Elevation Readout
Displays elevation (in feet) as set
at LDG ELEV selector. Scale set in
20--foot increments.
Less than
8,500 feet
Positive/
negative rates
at 100 fpm
Less than
8.65 psi
More than
8,500 but less
than 10,000 feet
More than
8.65 psi
More than
10,000 feet
Increments
of 100 feet
Positive/
negative rates
at 100 fpm
Increments
of 0.1 psi
Increments
of 20 feet
(cyan)
Data measured by the active
controller (PRESS CONT 1,
PRESS CONT 2)
Data measured by the monitoring source
(CPAM, PRESS CONT 1, PRESS CONT 2)
P
SOURCE INDICATOR --
Monitoring / Reference
Comes on (white) to
indicate monitoring source:
CPAM, or
PRESS CONT 1, or
PRESS CONT 2
If all sources failed, comes
on as dashes (amber).
SOURCE INDICATOR --
ACTIVE CONTROLLER
Comes on (white) to
indicate pressurization
controller:
PRESS CONT 1, or
PRESS CONT 2, or
PRESS MAN
Active Controller’s Data
Displayed on ECS
page only.
Vol. 1 08--60--7
REV 56, Jan 31/03
ENVIRONMENTAL CONTROL SYSTEM
Pressurization System
Flight Crew Operating Manual
CSP A--013
MASTER
2. OUTFLOW VALVES
The dual, redundant, electro--pneumatic outflow valves are installed on the rear pressure
bulkhead, below floor level, and are designated as the primary and secondary valves. Both
valves are slaved together through a pneumatic line and are electrically controlled. The
valves will respond to either electrical signals in automatic mode, or to pneumatic input
signals from the manual regulators on the CABIN PRESS control panel.
3. CABIN PRESSURE CONTROLLERS
The aircraft is equipped with dual, redundant pressure controllers, which operate only in
automatic mode. All controller outputs are sent to the outflow valves. 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. Inputs to the pressure
controllers are received from air data computer (ADC 1) normally. 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:
CABIN PRESSURE ALTITUDE (feet) AC FLIGHT ALTITUDE
(feet)
DECENT CLIMB
--600 --600 0
--600 0 5,000
--350 575 10,000
740 1,240 15,000
1,260 1,630 17,500
1,770 2,020 20,000
4,270 4,330 30,000
5,990 5,990 35,000
6,880 6,880 37,500
7,990 7,990 41,000
A. Automatic Pressurization Modes
S Ground mode,
Both outflow valves are driven full open.
S Pre-Pressure mode,
When thrust levers are advanced to take-off, the cabin is pressurized to --150 feet at
approximately 300 ft/min.
REV 56, Jan 31/03
　
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