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The contacts of an energized ACAU overheat relay cause these
operations:
* The bleed air control signal closes the bleed air regulator
solenoid valve
* The air conditioning/bleed air controls panel BLEED TRIP
OFF light comes on
* The P7 MASTER CAUTION and AIR COND annunciator lights
come on
* A holding circuit connects through the air conditioning panel
TRIP RESET push-button switch.
To get control of the engine bleed system after a bleed trip off,
these conditions must occur:
* The overpressure or overtemperature switch must return to
its normal (open) condition
* You must push the air conditioning panel TRIP RESET pushbutton
switch (to break the holding circuit).
The air conditioning panel engine BLEED switch has multiple
poles. One set of poles controls the solenoid valve circuit.
Another set of poles supplies discrete signals to the flight
management computer.
PNEUMATIC - ENGINE BLEED AIR - BLEED AIR CONTROL CIRCUIT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 36-11-00
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36-11-00-213
The open and close coils on the bleed air regulator solenoid
valve are constant duty coils. The solenoid valve also has a
mechanical latch. When there is a loss of electric power, the
solenoid valve will stay in the last electrically commanded
position.
PNEUMATIC - ENGINE BLEED AIR - BLEED AIR CONTROL CIRCUIT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN ALL 36-11-00
Page 24
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-11-00-213
PNEUMATIC - ENGINE BLEED AIR - BLEED AIR CONTROL CIRCUIT - FUNCTIONAL DESCRIPTION
PNEUMATIC - ENGINE BLEED AIR - BLEED AIR CONTROL CIRCUIT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 101-118 36-11-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-11-00-213
PNEUMATIC - ENGINE BLEED AIR - BLEED AIR CONTROL CIRCUIT - FUNCTIONAL DESCRIPTION
PNEUMATIC - ENGINE BLEED AIR - BLEED AIR CONTROL CIRCUIT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 001-017, 019-099, 201-999 36-11-00
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-11-00-213
PNEUMATIC - ENGINE BLEED AIR - BLEED AIR CONTROL CIRCUIT - FUNCTIONAL DESCRIPTION
PNEUMATIC - ENGINE BLEED AIR - BLEED AIR CONTROL CIRCUIT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
GUN 018 36-11-00
Page 27
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
36-11-00-213
THIS PAGE IS INTENTIONALLY LEFT BLANK
PNEUMATIC - ENGINE BLEED AIR - BLEED AIR CONTROL CIRCUIT - FUNCTIONAL DESCRIPTION
36-11-00
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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The engine bleed air distribution system supplies temperature
and pressure regulated air to the bleed air manifold.
Functional Description
The pressure regulator and shutoff valve (PRSOV) controls the
flow of engine bleed air to the pneumatic manifold.
The bleed air regulator (BAR) operates the PRSOV with control
pressure. The source of pressure for the BAR is the engine
bleed interstage duct. The BAR gets electrical control from a
28v dc signal. This signal comes from the air conditioning
accessory unit (ACAU). When the BAR solenoid valve opens
electrically, it supplies control pressure to open the PRSOV
against spring force. When the BAR closes electrically, it bleeds
the control pressure from the PRSOV. Spring force closes the
PRSOV.
The ACAU gets inputs from these controls and sensors:
* The engine fire switch
* Engine bleed switch
* Engine start valve
GUN 018
* The BAR 180 psi overpressure (OVPR) switch
GUN 001-017, 019-099, 101-118, 201-999
* The BAR 220 psi overpressure (OVPR) switch
GUN ALL
* The 490F (254C) overheat switch (engine strut duct).
Usually, the engine bleed switch controls the BAR. In the ON
position, the switch supplies a signal through the ACAU to open
the solenoid valve in the BAR. In the OFF position, the switch
supplies a signal to close the solenoid valve in the BAR.
　
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