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 
Page 6 
D633W101-BEJ  Sep 05/2002 

AIR CONDITIONING -PRESSURIZATION -INDICATIONS -EICAS DISPLAY

EFFECTIVITY BEJ ALL  21-30-00 
Page 7 
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 
Page 8 
D633W101-BEJ  Sep 05/2002 

AIR CONDITIONING -PRESSURIZATION -INDICATIONS -AIR SUPPLY MAINTENANCE PAGE FORMAT

EFFECTIVITY BEJ ALL  21-30-00 
Page 9 
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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