AIR CONDITIONING -PRESSURIZATION -GENERAL DESCRIPTION
EFFECTIVITY BEJ ALL 21-30-00
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D633W101-BEJ Jan 05/2002
AIR CONDITIONING -PRESSURIZATION -INDICATIONS -EICAS DISPLAY
ECS Data Block
This pressurization information shows in the ECS (environmental control system) data block on the EICAS display:
*
Duct pressure
*
Cabin altitude (CAB ALT)
*
Rate in feet per minute
*
Forward and aft outflow valve position
*
Landing altitude (LDG ALT)
*
Indication of landing altitude from AIMS (AUTO) or from bleed air/pressurization panel (MAN).
*
Cabin differential pressure (~P)
The ECS data block shows for these conditions:
*
Duct pressure less than 11 psi with the related engine running
*
Cabin altitude exceedance
*
Selection of manual outflow valve operation
*
Manual input of landing altitude
*
Differential pressure exceedance
*
Display of a related alert message
*
Selection of the air synoptic display.
The ECS data block goes away after the condition which caused it goes away.
Duct pressure shows these colors for these conditions:
* White when duct pressure is 11 psi or more * Amber if duct pressure is less than 11 psi.
Cabin altitude shows these colors for these conditions:
*
White for a cabin altitude of 8500 feet or lower
*
Amber if cabin altitude is higher than 8500 feet
*
Red if the cabin altitude warning message shows.
Differential pressure shows these colors for these conditions:
*
White when ~P is 8.95 psi or less
*
Amber if ~P is more than 8.95 PSI
*
Red if ~P is more than 9.42 PSI.
Cabin Altitude Warning Message
A warning message shows if cabin altitude is higher than a safe limit. The cabin altitude at which the warning message shows is related to the selected landing altitude:
*
If the landing altitude is 9,650 feet or lower, then the warning message shows at 10,000 feet
*
If the landing altitude is higher than 9,650 feet, then the warning message shows at 14,200 feet
*
If the landing altitude data is not valid, then the warning message shows at 15,000 feet.
EFFECTIVITY BEJ ALL 21-30-00
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D633W101-BEJ Sep 05/2002
AIR CONDITIONING -PRESSURIZATION -INDICATIONS -EICAS DISPLAY
EFFECTIVITY BEJ ALL 21-30-00
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D633W101-BEJ May 05/2002
AIR CONDITIONING -PRESSURIZATION -INDICATIONS -AIR SUPPLY MAINTENANCE PAGE FORMAT
Air Supply Maintenance Page
The air supply maintenance page shows this cabin pressure system information:
*
Cabin altitude (CAB ALT)
*
Rate in feet per minute
*
Landing altitude (LDG ALT)
*
Indication of landing altitude from AIMS (AUTO) or from bleed air/pressurization panel (MAN)
*
Differential pressure (~P)
*
Indication of left (L) or right (R) air supply/cabin pressure controller (ASCPC) in control (message goes away if none are in control).
The air supply maintenance page shows this outflow valve information:
*
Forward and aft outflow valve position (0.00 closed, 1.00 fully open)
*
Indication of manual (MAN) control of each outflow valve (no indication shows for automatic control).
EFFECTIVITY BEJ ALL 21-30-00
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D633W101-BEJ Sep 05/2002
AIR CONDITIONING -PRESSURIZATION -INDICATIONS -AIR SUPPLY MAINTENANCE PAGE FORMAT
EFFECTIVITY BEJ ALL 21-30-00
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D633W101-BEJ May 05/2002
AIR CONDITIONING -PRESSURIZATION -SYSTEM TESTS
General
These are the pressurization system tests that show when you select ATA 21 Cabin Pressure Control System:
*
Left cabin pressure control system
*
Right cabin pressure control system.
Left and Right Cabin Pressure Control System
These tests make sure that these LRUs operate correctly:
*
Cabin pressure control function of the related ASCPC
*
Forward outflow valve
*
Aft outflow valve.
During the test, the outflow valves move. The tests take approximately 1-2 minutes each.
WARNING: MAKE SURE THAT PERSONS ARE CLEAR OF THE FORWARD AND THE AFT OUTFLOW VALVE ASSEMBLIES BEFORE YOU DO THIS TEST. INJURY TO PERSONS CAN OCCUR.
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