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12,800 feet
12,000 feet
Landing Elevation
11,000 ft
10,700 feet
Cabin Altitude
More than 3 minutes
Example:
More than 3 minutes
GX_13_055
For Training Purposes Only
Sept 04
13-53
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
TAKEOFF AT FIELD ELEVATION GREATER THAN 7,230 FEET
When the airplane is in the climb, the CABIN ALT warning and caution decrease
proportionally to the airplane altitude. As soon as cabin altitude reaches 7,230 feet or
airplane reaches 41,000 feet or above, the CABIN ALT caution is reset to 8,200 feet
and the CABIN ALT warning is reset to 9,000 feet.
ABORTED TAKEOFF ABOVE 7,230 FEET
The take off is identical to normal takeoff above 7,230 feet. When the airplane starts to
descend, an aborted takeoff sequence is initiated. The landing is similar to landing
above 7,230 feet.
Example:
Takeoff Elevation 13,700 feet
Warning
Caution
14,500 feet
13,700 feet
Takeoff Elevation
13,400 feet
Cabin Altitude
Airplane Altitude 41,000 feet
Warning 9,000 feet
Caution 8,200 feet
7,230 feet
Cabin Altitude
GX_13_056
Example:
Takeoff Elevation 13,700 feet
Warning
Caution
14,500 feet 14,500 feet
13,400 feet 13,400 feet
Cabin Altitude
Landing Elevation
13,700 feet
GX_13_057
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
13-54 For Training Purposes Only
Sept 04
MANUAL MODE
In the manual mode, cabin pressure is manually controlled by selecting the applicable
switches on the Pressurization Control Panel.
Selecting MAN will display both outflow valve position indicators, and an analog rate
of change gauge. It also eliminates the LDG ELEV message from the status page and
displays a status message on the EICAS.
When the MAN ALT (spring loaded) toggle switch is selected to UP both outflow
valves open slowly and the cabin altitude increases proportionally to the outflow
change.
MAN
MAN
MAN PRESS
MAN ALT
AUTO/
MAN
MAN
UP
DN
MAN ALT Toggle Switch
UP
DN
Used to control cabin altitude in
manual mode.
Spring-loaded to mid position.
– Commands cabin to climb.
– Commands cabin to descend.
AUTO/MAN Switch
Used to select mode of
operation.
– Indicates AUTO
mode is selected.
– Indicates MAN
mode is selected.
GX_13_058
MAN PRESS CONTROL
MAN
GX_13_059
1300
90%
13% 13%
1 . 02
20
19 20
22 22
20
CABIN (°C) CABIN (°C)
OXYGEN
CKPT (°C) AFT
OPEN OPEN
OUTFLOW VALVES
CAB ALT
CAB RATE
P
0 0
1 2
1 2
1 2
OUTFLOW VALVES Position Indicators
Displayed when MAN selected and measured in percent.
Also displayed when EMER DEPRESS selected, or
OUTFLOW VLV closed, or DITCHING selected.
MAN Mode Data Display
CAB RATE
LDG ELEV
– Sweep range
displayed in feet (-2500 to
2500 fpm)
– Not displayed, crew
must monitor CAB ALT.
MAN ALT
UP
DN
N U
GX_13_060
48% 48%
OPEN OPEN
OUTFLOW VALVES
1 2
For Training Purposes Only
Sept 04
13-55
P I LOT T R A I N I N G GU I D E
INTEGRATED AIR MANAGEMENT SYSTEM
When the MAN ALT toggle switch is selected to DN, both outflow valves close
slowly and the cabin altitude decreases proportionally to the outflow change.
The desired control (climb, level, descent) is maintained by adjusting the outflow
valve positions according to flow or differential pressure changes.
MANUAL MODE OPERATION
In order to control pressurization, MAN/ALT toggle switches are required:
• To increase cabin altitude select:
• MAN/ALT toggle switch to UP momentarily and monitor climb rate and cabin
altitude
• To decrease cabin altitude select:
• MAN/ALT toggle switch to DN momentarily and monitor descent rate and
cabin altitude
• To maintain cabin altitude select:
• MAN/ALT toggle switch to mid position when reaching target cabin altitude
(see the chart below)
• During descent select:
• MAN/ALT toggle switch adjust UP or DN to attain landing elevation
• MAN/ALT toggle switch to mid position to maintain landing elevation
Cruise Flight Level 180 200 220 240 260 280 290 310 330
Target Cabin Altitude 1146 1385 1643 1925 2233 2573 2758 3139 3440
Target ΔP 6.76 7.22 7.64 8.01 8.33 8.61 8.72 8.94 9.16
　
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