曝光台 注意防骗
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115v ac.
Training Information Point
The air in the pneumatic system is hot and under high pressure.
Make sure you depressurize the pneumatic system before you
work on it.
Abbreviations and Acronyms
* ACAU - air conditioning accessory unit
* APU - auxiliary power unit
* BAR - bleed air regulator
* BAV - bleed air valve
* C - Celsius
* CTAI - cowl thermal anti-ice
* F - Farenheit
* ISO valve - isolation valve
* PRSOV - pressure regulator and shutoff valve
* TAT - total air temperature
* XFER - transfer
* XMTR - transmitter
* WTAI - wing thermal anti-ice
PNEUMATIC - INTRODUCTION
EFFECTIVITY
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Engine Bleed Air
The engine bleed system components are on the engine
compressor cases and in the engine struts.
Pneumatic Manifold
The pneumatic manifold (crossover duct) is in these areas:
* The leading edges of the wing inboard of the engine struts
* The crossover duct is in the forward areas of the air
conditioning pack bays
* The keel beam.
APU Bleed Air
The APU and the APU bleed system components are in a torque
box in the 48 section.
The APU bleed air duct is in these areas:
* Along the right side of the APU torque box
* Through section 48 and the aft pressure bulkhead
* Along the left side and forward bulkhead of the aft cargo
compartment
* In the keel beam.
Controls and Indication
The pneumatic system controls and indications are on the air
conditioning/bleed air controls panel in the flight compartment.
PNEUMATIC - COMPONENT LOCATIONS
EFFECTIVITY
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General
The pneumatic system supplies hot, high pressure air to the
systems on the airplane that use air.
These are the sources of pneumatic power:
* Engine bleed air
* APU
* Ground source.
Engine Bleed Air
There is one bleed air system for each engine. The engine
bleed system controls bleed air temperature and pressure.
Engine bleed air comes from the 5th and 9th stages of the high
pressure compressor. A high stage regulator and high stage
valve control the flow of 9th stage bleed air. The 5th stage check
valve prevents reverse flow into the 5th stage.
A bleed air regulator and the pressure regulator and shutoff
valve (PRSOV) control the flow of bleed air to the pneumatic
manifold.
The air conditioning accessory unit (ACAU) contains relays, and
is an interface between the air conditioning/bleed air controls
panel switches and lights.
Engine Bleed Air Precooler System
The precooler system controls the engine bleed air
temperature. The precooler control valve, precooler control
valve sensor, and WTAI solenoid valve control the flow of fan air
to the precooler.
APU Bleed Air
The APU supplies bleed air to the pneumatic manifold. An APU
check valve protects the APU from engine bleed air flow.
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