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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-10-00-001
General
These are the major components for the auxiliary power unit:
* Fuel manifolds
* Fuel nozzles
* Oil cooler
* Starter-generator
* Bleed air valve (BAV)
* Inlet guide vane actuator (IGVA)
* Pressure sensors
* Ignition unit
* Surge control valve (SCV)
* Data memory module (DMM)
* Lube module
* Fuel control unit (FCU)
* APU engine.
APU POWER PLANT - AUXILIARY POWER UNIT - INTRODUCTION
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-10-00-002
APU POWER PLANT - AUXILIARY POWER UNIT - INTRODUCTION
APU POWER PLANT - AUXILIARY POWER UNIT - INTRODUCTION
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-10-00-002
Purpose
The APU wiring harness holds all the electrical wires in one
assembly.
Location
The APU wiring harness goes from the firewall connector to the
front of the APU. From the front of the APU it goes in different
directions to connect all electrical components.
Physical Description
The wires have shields with twisted pair conductors to keep
electromagnetic interference to a minimum. The harness
connectors are stainless steel and have a self-lock connection.
Training information point
The harness connectors have an index to prevent improper
connections.
APU POWER PLANT - WIRING HARNESS
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-10-00-004
APU POWER PLANT - WIRING HARNESS
APU POWER PLANT - WIRING HARNESS
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-10-00-004
Purpose
Three primary APU engine mounts hold the APU in its
compartment. The mounts isolate the airplane structure from
APU vibration. The primary APU engine mounts use a cone bolt
type interface.
The forward left mount is a redundant vertical strut. This mount
is not vibration isolated. The forward right side strut is also
redundant. If there is a mount failure, these redundant struts,
with the remaining primary mounts, hold the APU.
Location
The two forward mounts attach to a single crossbeam. The
crossbeam attaches to the upper structure of the APU
compartment.
The two aft mounts attach to a double crossbeam. These
crossbeams attach to the upper structure of the APU
compartment.
The right forward and right aft mounts attach to the side wall of
the APU compartment.
Training Information Point
All of the vertical primary mount struts are adjustable at the top.
However, adjustments to the primary mount struts are not
required unless a strut is repaired or replaced. The redundant
vertical strut (forward left) and the redundant side strut (forward
right) may require adjustment during APU replacement. To gain
access to the upper jam nut on the mount strut it is necessary to
remove the firewall cover. Care must be taken not to damage
the firewall cover.
APU POWER PLANT - APU MOUNTS
EFFECTIVITY
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D633A101-GUN Oct 10/2002
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-10-00-003
APU POWER PLANT - APU MOUNTS
APU POWER PLANT - APU MOUNTS
EFFECTIVITY
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D633A101-GUN Feb 10/2003
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-10-00-003
Purpose
The APU air inlet supplies air to the APU for APU engine and
load compressor operation.
Location
These are the air inlet components on the lower right side of the
tail section:
* Inlet door housing
* Air inlet door
* Air inlet door vortex generator and flap
* Air inlet door actuator and actuator rods
* Air inlet door switch
* Diffuser ducts
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