Page 5 D633W101-BEJ Sep 05/2002
AIR SUPPLY DISTRIBUTION -GENERAL DESCRIPTION
The APUC gives APU on or off information to the ASCPCs. It also sends a signal to open the APUSOV for an air start of the APU. The ASCPCs use APUC information when calculating valve positions.
The ADIRU gives airplane altitude information to the ASCPCs. The ASCPCs use altitude information when they do a test of the system.
BITE circuits in the ASCPCs monitor the condition of the system. You use the MAT to do ground tests of the system.
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AIR SUPPLY DISTRIBUTION -GENERAL DESCRIPTION
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D633W101-BEJ Jan 05/2002
AIR SUPPLY DISTRIBUTION -ISOLATION VALVE AND GROUND CONNECTOR -COMPONENT LOCATIONS
General
There are three isolation valves and three high pressure ground connectors.
Location
The isolation valves are installed in the pneumatic manifold just aft of the ECS bay door.
The connectors are forward of the environmental control system bay door to the left of the keel beam.
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AIR SUPPLY DISTRIBUTION -ISOLATION VALVE AND GROUND CONNECTOR -COMPONENT LOCATIONS
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D633W101-BEJ Jan 05/2002
AIR SUPPLY DISTRIBUTION -APU SHUTOFF VALVE AND DUCT -COMPONENT LOCATIONS
Auxiliary Power Unit Shutoff Valve
The auxiliary power unit shut off valve (APUSOV) is forward of the APU access door. You open the access the door forward of the APU access door to get access to the APUSOV.
Distribution Duct
The main distribution duct is along the front wing spar and in the fuselage from the ECS bays to the APU firewall.
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AIR SUPPLY DISTRIBUTION -APU SHUTOFF VALVE AND DUCT -COMPONENT LOCATIONS
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D633W101-BEJ Jan 05/2002
AIR SUPPLY DISTRIBUTION -ISOLATION VALVES
Purpose
The isolation valves control the air flow direction in the pneumatic manifold from both engines, the APU, and the ground air supply.
Physical Description
Each isolation valve has these parts:
*
Actuator
*
Solenoid
*
Valve body
*
Electrical connector
*
Manual override and position indicator assembly
*
Rotary variable differential transformer (RVDT).
Location
The left isolation valve is aft of the left environmental control system (ECS) access door. You open the access panel 195QL to get access to the left isolation valve.
The center isolation valve is aft of the right ECS access door. You open the access panel 196NR to get access to the center isolation valve.
The right isolation valve is aft of the right ECS door. You open the access panel 196QR to get access to the right isolation valve.
Functional Description
The isolation valves are two-position valves that are spring-loaded closed. The valves are electrically controlled and pneumatically actuated.
Training Information Point
Install the isolation valves with the placard in view and the electrical connection accessible.
The isolation valves are identical and interchangeable with each other and with the APU shutoff valve.
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AIR SUPPLY DISTRIBUTION -ISOLATION VALVES
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D633W101-BEJ Jan 05/2002
AIR SUPPLY DISTRIBUTION -APU SHUTOFF VALVE
Purpose The APU shutoff valve is identical and interchangeable with the
isolation valves. The APU shutoff valve (APUSOV) controls the flow of bleed air from the APU into the pneumatic manifold.
Location
The APUSOV is in the lower aft section of the airplane just forward of the APU firewall.
Physical Description
The APUSOV has these parts:
*
Actuator
*
Manual override and position indicator assembly
*
Valve body
*
Electrical connector
*
Rotary variable differential transformer (RVDT)
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