AIR CONDITIONING -PRESSURIZATION -GENERAL DESCRIPTION

EFFECTIVITY BEJ ALL  21-30-00 
Page 5 
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.
　
中國航空網(wǎng) www.k6050.com
航空翻譯 www.aviation.cn
本文鏈接地址：777 AMM 飛機維護手冊 空調(diào) Air Conditioning(32)