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on the left side. They measure the manifold pressures.
Pressure indication is on the air conditioning panel.
The right side of the manifold has a pneumatic ground air
connector.
Valves on the pneumatic manifold control the flow of air to the
user systems. The user systems control the operation of these
valves.
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Training Information Point
Do not supply more than 60 psi of pressure to the pneumatic
system. If you supply too much pressure, damage to equipment
and injuries to personnel can occur.
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Purpose
The engine bleed air distribution system supplies pressure
regulated air to the pneumatic manifold.
General Description
Bleed air comes from the 9th and 5th stages of the engine high
stage compressors. At low engine speed, the pneumatic system
uses 9th stage bleed air. 5th stage air is not sufficient for
pneumatic system demands at low engine speeds.
At low engine speed the high stage regulators and high stage
valves control the pressure of the engine bleed air.
At low engine speed the 5th stage check valves prevent reverse
flow. At high engine speed the high stage valves close and the
5th stage check valves open to supply bleed air to the pressure
regulating shutoff valves.
The air conditioning bleed air controls panel has engine bleed
switches to control the pressure regulating shutoff valves. Also,
there are BLEED TRIP OFF lights to show overpressure or
overtemperature.
The bleed air regulators and pressure regulator and shutoff
valves control the flow of engine bleed air to the pneumatic
manifold. The bleed air regulators have overpressure switches
to prevent overpressure conditions and turn on the BLEED TRIP
OFF lights.
The 450F (232C) thermostats make the pressure regulating and
shutoff valves move towards closed when the temperature gets
to 450F (232C).
The air conditioning accessory unit (ACAU) is an interface
between the air conditioning bleed air controls panel and the
pressure regulating shutoff valves.
The 490F (254C) overheat switches turn on the BLEED TRIP OFF
lights and close the pressure regulating shutoff valves. This
prevents overheat damage to the pneumatic manifold and user
systems.
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