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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-50-00-003
The bleed air valve has a spring to hold it in the closed position.
Air from the APU load compressor moves the valve open when
the ECU energizes the solenoid.
NOTE: Bleed duct pressure will be 0-6 psig when the APU
bleed air switch is in the OFF position.
APU BLEED AIR SYSTEM - APU BLEED AIR VALVE - FUNCTIONAL DESCRIPTION
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APU BLEED AIR SYSTEM - APU BLEED AIR VALVE - FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The inlet guide vanes control the air flow to the load
compressor. THe IGV actuator controls the IGV position.
Physical Description
Sixteen inlet guide vanes (IGVs) are inside the APU around the
load compressor inlet. These are the parts in the inlet guide
vane assembly:
* Inlet guide vanes (16)
* Ring gear
* Support assembly
* Segment gears (16).
The inlet guide vane actuator (IGVA) is on the right side of the
compressor. These are the actuator components:
* Electrical connector
* Linear variable differential transformer (LVDT)
* Actuator rod
* Fuel inlet line
* Fuel return line
* Drain line.
Functional Description
The inlet guide vanes turn between 15 degrees (fully closed) to
115 degrees (fully open). The vanes do not fully close. The
vanes are set to stop at the 15 degrees position to cool the load
compressor.
The actuator receives signals from the ECU and uses fuel
pressure from the FCU to move the vanes. The ECU controls the
inlet guide vanes to the correct angle by the air demand from
the airplane.
Training Information Point
The IGV position shows on the CDU in the flight compartment.
APU BLEED AIR SYSTEM - INLET GUIDE VANES AND ACTUATOR
EFFECTIVITY
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APU BLEED AIR SYSTEM - INLET GUIDE VANES AND ACTUATOR
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The ECU receives airplane systems inputs and selects from
four bleed air modes. These are the bleed air modes:
* No bleed
* Duct pressurization
* Main engine start
* Air conditioning system (ACS).
The ECU sends a signal to the IGV actuator to change the angle
of the IGVs. The angle of the IGVs changes to control the air
supply.
The ECU puts the IGVs at 15 degrees when the APU bleed air
valve closes.
No Bleed Mode
The no bleed mode occurs when the ECU closes the IGVs to 15
degrees, the APU bleed valve closes, and there is no pneumatic
system demand.
Duct Pressurization Mode
The ECU selects the duct pressurization mode when the APU
bleed air valve opens and there is no air system demand. The
IGVs open to let the load compressor pressurize the air ducts.
Main Engine Start Mode
In main engine start mode, the ECU opens the IGVs to meet the
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