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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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PNEUMATIC - MANIFOLD SYSTEM - BLEED AIR ISOLATION VALVE
PNEUMATIC - MANIFOLD SYSTEM - BLEED AIR ISOLATION VALVE
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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Purpose
The bleed air isolation valve is in the center of the crossover
duct to separate the left and right pneumatic systems or to
connect them when necessary.
Functional Description
A three-position toggle switch on the air conditioning/bleed air
controls panel controls the valve motor and valve position.
When the bleed air isolation valve switch is in the AUTO
position, the control of the isolation valve comes from these air
conditioning panel switches:
* R PACK switch
* L PACK switch
* ENG 1 BLEED switch
* ENG 2 BLEED switch.
When the isolation valve switch is in AUTO, these switches
supply the logic to control the bleed air isolation valve position.
When all the toggle switches are in the AUTO, HIGH, or ON
positions, the valve closes.
The control circuit shows a typical cruise condition. The bleed
air isolation valve will remain closed. In this configuration, the
pneumatic manifold divides into a left and right side. This
prevents a single pneumatic duct failure from loss of pressure
to all of the manifold.
When any one of the pack or engine bleed switches is in the
OFF position, the valve opens.
A trip off condition closes a pack or bleed valve, but does not
change the position of its air conditioning panel control switch.
The circuit uses switch position logic, not valve position logic.
PNEUMATIC - MANIFOLD SYSTEM - BLEED AIR ISOLATION VALVE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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PNEUMATIC - MANIFOLD SYSTEM - BLEED AIR ISOLATION VALVE - FUNCTIONAL DESCRIPTION
PNEUMATIC - MANIFOLD SYSTEM - BLEED AIR ISOLATION VALVE - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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36-14-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The APU bleed air system supplies bleed air to the pneumatic
manifold:
* On the ground
* In the air (up to 17,000 feet).
The APU can supply bleed air to these systems:
* Engine start systems
* ECS systems.
Location
The APU and bleed air valve are in the APU compartment.
The air conditioning/ bleed air controls panel is in the flight
compartment.
The APU bleed air duct is in these areas:
* APU compartment
* Section 48 stabilizer compartment
* Left side and forward bulkhead of the aft cargo compartment
* Inside the keel beam.
The APU check valve is in the keel beam, between the forward
air conditioning bays.
General Description
The APU supplies bleed air to the pneumatic manifold. The APU
bleed air duct connects the APU bleed air valve to the
pneumatic manifold.
An APU check valve is in the APU duct. This valve protects the
APU from engine bleed air flow.
See the APU chapter for more information on the APU bleed air
pressure control (SECTION 49-50).
PNEUMATIC - APU BLEED SYSTEM - INTRODUCTION
EFFECTIVITY
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PNEUMATIC - APU BLEED SYSTEM - INTRODUCTION
PNEUMATIC - APU BLEED SYSTEM - INTRODUCTION
EFFECTIVITY
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PNEUMATIC - APU BLEED SYSTEM - INTRODUCTION
PNEUMATIC - APU BLEED SYSTEM - INTRODUCTION
EFFECTIVITY
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