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Pneumatic Manifold
The pneumatic manifold gets high pressure air from the source
systems and supplies it to the user systems. The pneumatic
manifold has these features:
* An isolation valve that can separate the manifold into left and
right sides
* Two duct pressure transmitters (for left and right manifold
pressure indication)
* A ground pneumatic connector with a check valve (for an
external source of pneumatic power)
* Pressure taps and interfaces for user system valves.
Controls and Indications
The air conditioning/bleed air controls panel has control
switches and lights to control and monitor the pneumatic
system.
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EFFECTIVITY
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The DUAL BLEED light is an amber light that comes on when
the APU bleed valve is open and:
* Number 1 engine bleed switch on, or
* Number 2 engine bleed switch on and isolation valve open.
The dual duct pressure indicator shows the pressure in the left
and right pneumatic manifold.
The isolation valve switch has these three positions:
* CLOSE - isolates left and right pneumatic manifold
* AUTO - the valve opens automatically if any pack or engine
bleed switch is put in the OFF position
* OPEN - connects left and right pneumatic systems.
The trip reset switch is used to reset a bleed trip off condition.
The engine bleed switch has these two positions:
* OFF - closes the PRSOV
* ON - opens the PRSOV.
The BLEED TRIP OFF lights are amber lights. There is one
BLEED TRIP OFF light for the left and right pneumatic manifold.
They turn on when the pneumatic system has an overpressure
or overtemperature condition.
The APU bleed switch has these two positions:
* OFF - closes the APU bleed valve
* ON - opens the APU bleed valve.
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EFFECTIVITY
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Purpose
The pneumatic distribution system supplies compressed air to
the user systems.
General Description
The distribution system has these subsystems:
* Engine bleed air system
* APU bleed air system
* Pneumatic ground air connection
* Pneumatic manifold system.
Engine Bleed Air System
There are two engine bleed air systems, one for each engine.
Engine bleed air is from the 5th and 9th stages of the engine
high pressure compressors. At low engine speeds, bleed air
comes from the 9th stage. At high engine speeds, bleed air
comes from the 5th stage.
APU Bleed Air System
The APU load compressor supplies bleed air on the ground and
in the air.
Pneumatic Ground Air Connection
The pneumatic ground air connection provides for the
connection of a ground pneumatic cart. The pneumatic cart
can supply bleed air for engine start and ground use of the air
conditioning system.
Pneumatic Manifold System
The pneumatic manifold system gets bleed air from the
engines, APU, or pneumatic ground cart.
A bleed air isolation valve divides the pneumatic manifold into
left and right sides. The normal position of this valve is closed.
Because of this, a single duct failure cannot cause a loss of
pressure to the whole pneumatic manifold.
The pneumatic manifold has two pressure transmitters. One
transmitter is on the right side of the manifold and the other is
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