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Selects either manual or automatic control of pressurization system.
When pressed in, manual mode selected. Removes electrical supply
from both outflow valves, locks them in their existing position and
permits their manual (pneumatic) operation. MAN (white) light comes
on and EICAS displays pressurization system data on EICAS primary
display.
When pressed out, automatic mode is selected and MAN light goes
secondary display.
When pressed twice, the redundant controller gains control.
FAULT (amber) light comes on when system detects failure of both
cabin pressure controllers. EICAS displays AUTO PRESS caution
message.
out. Automatic mode pressurization data is displayed on EICAS
RATE Control (Needle
Valve) (Manual Mode)
Pneumatically adjusts
outflow valve rate
during manual mode.
Ascent from 50 fpm
Descent from 50
fpm.
Ascent and descent
rates indicated on ECS
page of EICAS.
REV 56, Jan 31/03
Vol. 1 08--60--4
ENVIRONMENTAL CONTROL SYSTEM
Pressurization System
Flight Crew Operating Manual MASTER
CSP A--013
Pressurization --- EICAS Messages <MST>
Figure 08---60---3 Sheet 1
EMER DEPRESS caution (amber)
Comes on when EMER DEPR switch/light has been
selected on.
CABIN ALT caution (amber)
Comes on when cabin altitude is greater than
8,500 feet but not greater than 10,000 feet.
AUTO PRESS caution (amber)
Comes on at a failure of both automatic pressurization
controllers.
Pressurization Readouts (manual mode)
Comes on when PRESS CONTROL switch/light
operated to MAN:
C ALT -- Indicates current cabin altitude.
RATE -- Indicates rate of change in feet per minute
(increments of 100 fpm) and direction via arrow
symbol.
P -- Indicates cabin and cockpit to ambient
differential pressure.
Landing Elevation readout is not displayed.
Readouts removed from primary
page when automatic mode selected.
NOTE
There may be an EICAS time
delay/ instrument lag between
the display of a red P readout
and a subsequent DIFF PRESS
warning message and CABIN
PRESSURE aural coming on.
NOTE
500
C ALT RATE P
500 4.0
CABIN ALT warning (red)
Comes on when cabin altitude
is greater than 10,000 feet.
Accompanied by aural warning:
DIFF PRESS warning (red)
Comes on when differential
pressure is greater than 8.6 psi.
Accompanied by aural warning:
Primary Page
<0039> <0006>
CABIN
PRESSURE
CABIN
PRESSURE
Vol. 1 08--60--5
REV 56, Jan 31/03
ENVIRONMENTAL CONTROL SYSTEM
Pressurization System
Flight Crew Operating Manual
CSP A--013
MASTER
Pressurization --- EICAS Messages <MST>
Figure 08---60---3 Sheet 2
Status Page
<0039>
<0039>
Pressurization Readouts (automatic mode)
Comes on when pressurization system is operated
in automatic mode; PRESS CONTROL switch/light
pressed out.
LANDING FIELD ELEVATION readout
Displays elevation (20 foot increments) as set at LDG
ELEV selector.
-- Amber dashes are displayed if input value is invalid or
greater than 14,000 ft or less than --1,000 ft.
-- Elevation readout not displayed on status page when
manual mode selected.
CABIN PRESS MAN status (white)
Comes on to indicate that PRESS CONTROL
switch/light is operated to MAN.
CPAM FAIL status (white)
Comes on to indicate failure of cabin pressure
acquisition module (CPAM).
-- Oxygen system will not auto--deploy at 14,000 feet.
-- Seatbelt / No smoking signs will not automatically
come on when cabin altitude exceeds 10,000 feet.
C ALT -- Indicates current cabin altitude. Readout
will turn to amber, if cabin altitude is greater than
8,500 feet but less than 10,000 feet. Readout will
turn to red when cabin altitude is 10,000 feet or
above.
RATE -- Indicates rate of change in feet per minute
(increments of 100 fpm) and direction via arrow
symbol.
AUTO PRESS 1, 2 FAIL status (white)
Comes on to indicate failure of respective
automatic pressurization controller module.
P -- Indicates cabin to ambient differential
pressure. Readout will turn red when
differential pressure exceeds 8.65 psid.
REV 56, Jan 31/03
Vol. 1 08--60--6
ENVIRONMENTAL CONTROL SYSTEM
Pressurization System
Flight Crew Operating Manual MASTER
CSP A--013
Pressurization Synoptic Page Indications
Figure 08---60---4
CPAM FAIL status
(white)
Comes on to indicate
failure of cabin pressure
　
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