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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
49-30-00-000
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APU FUEL SYSTEM - INTRODUCTION
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General Description
GUN 001-099, 101-115
The airplane fuel system AC boost pumps supply fuel for APU
operation. The fuel goes through the APU fuel shutoff valve on
the left wing aft spar. The ac boost pumps can supply fuel from
any tank.
If the AC boost pumps do not supply fuel, the APU suction feeds
from the left main tank.
GUN 201-999
The airplane fuel system AC boost pumps or the APU dc boost
pump supply fuel for APU operation. The fuel goes through the
APU fuel shutoff valve on the left wing aft spar.
If AC boost pumps do not supply fuel, the APU DC boost pump
supplies fuel from the left main tank. If the ac and dc boost
pumps do not supply fuel, the APU suction feeds from the left
main tank.
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See the APU fuel fed system for more information.
(SECTION 28-25)
The ECU calculates the correct fuel flow for APU start and run.
The ECU uses these values to calculate the correct fuel flow:
* APU speed
* APU exhaust gas temperature (EGT)
* Inlet temperature (T2)
* Inlet pressure (P2)
* Fuel temperature.
The ECU sends the fuel flow command signal to the fuel control
unit (FCU) on the APU. The FCU sends the correct fuel flow to
the flow divider and flow divider solenoid.
The flow divider solenoid gets a signal from the ECU to inhibit
fuel flow to the secondary fuel manifold. The flow divider and
flow divider solenoid send the metered fuel from the FCU to the
primary and secondary fuel manifolds.
The fuel manifolds give primary and secondary fuel to ten dual
tipped fuel nozzles. The nozzles give the metered fuel to the
APU combustor.
Component Location
Most fuel system components are part of the fuel control unit.
The fuel control unit attaches to the lube module.
These are the APU fuel system components not in the fuel
control unit
* Flow divider
* Flow divider solenoid
APU FUEL SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
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D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-30-00-001
* Primary fuel manifold
* Secondary fuel manifold
* Fuel nozzles.
APU FUEL SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN ALL 49-30-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-30-00-001
APU FUEL SYSTEM - GENERAL DESCRIPTION
APU FUEL SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN 001-099, 101-115 49-30-00
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D633A101-GUN Jun 10/2006
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-30-00-001
APU FUEL SYSTEM - GENERAL DESCRIPTION
APU FUEL SYSTEM - GENERAL DESCRIPTION
EFFECTIVITY
GUN 201-999 49-30-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
49-30-00-001
THIS PAGE IS INTENTIONALLY LEFT BLANK
APU FUEL SYSTEM - GENERAL DESCRIPTION
49-30-00
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Purpose
The APU fuel control unit (FCU) supplies the correct metered
fuel for these APU operations:
* Start
* Acceleration
* On speed.
General
The FCU mounts to the front of the lube module by a V band
clamp. The lube module drives the FCU.
Training Information Point
The FCU and the inlet fuel filter are line replaceable units (LRU).
APU FUEL SYSTEM - FUEL CONTROL UNIT
EFFECTIVITY
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D633A101-GUN Oct 10/2005
BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.
737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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APU FUEL SYSTEM - FUEL CONTROL UNIT
APU FUEL SYSTEM - FUEL CONTROL UNIT
EFFECTIVITY
　
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