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APU FUEL FEED - GENERAL DESCRIPTION
28-25-00
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D633A101-GUN Oct 10/2005
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
General
The APU fuel feed system has these components:
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* APU dc boost pump
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* APU fuel feed line
* APU fuel feed line shroud
* APU fuel shutoff valve.
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APU DC Boost Pump
The APU dc boost pump is on the left wing rear spar.
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APU Fuel Feed Line
The APU fuel feed line starts in main tank 1, goes through the
center tank, then aft to the APU.
APU Fuel Feed Line Shroud
The APU fuel feed line shroud is around the APU fuel feed line.
The shroud has a drain line that connects to a drain mast on the
bottom of the left wing to body fairing.
APU Fuel Shutoff Valve
The APU shutoff valve is on the center section rear spar.
APU FUEL FEED - COMPONENT LOCATION
EFFECTIVITY
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D633A101-GUN Oct 10/2005
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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APU FUEL FEED - COMPONENT LOCATION
APU FUEL FEED - COMPONENT LOCATION
EFFECTIVITY
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
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APU FUEL FEED - COMPONENT LOCATION
APU FUEL FEED - COMPONENT LOCATION
EFFECTIVITY
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APU FUEL FEED - COMPONENT LOCATION
28-25-00
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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BOEING PROPRIETARY - Copyright#- Unpublished Work - See title page for details.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
APU Fuel Supply Line and Shroud
In the fuel tanks, the APU supply line is made from aluminum.
Outside the tanks, the APU supply line is made from rubber and
kevlar and is flexible. An aluminum shroud surrounds the
rubber/kevlar APU fuel supply line.
Shroud Drain Line
The shroud drain line connects the fuel line shroud to the drain
mast. Leaks in the fuel supply line, are contained by the shroud
and flow overboard through the drain mast.
NOTE: This drain mast also drains hydraulic fluid from system
A and B reservoirs.
APU FUEL FEED - APU FUEL SUPPLY LINE, SHROUD, AND DRAIN LINE
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
28-25-00-003
APU FUEL FEED - APU FUEL SUPPLY LINE, SHROUD, AND DRAIN LINE
APU FUEL FEED - APU FUEL SUPPLY LINE, SHROUD, AND DRAIN LINE
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
28-25-00-003
General
The APU fuel shutoff valve lets fuel flow from the left engine fuel
feed manifold to the APU.
Location
The APU fuel shutoff valve is on the center section rear spar.
Access is through the left wheel well.
Motor Actuated Valve
The motor actuated valve has a valve body and an actuator.
The valve body connects to the left engine fuel feed manifold
and the APU fuel feed line. The valve is a rotary type valve. The
alignment marks show valve position.
The actuator is a 28v dc motor. It has a manual override lever
that permits valve operation without electrical power. The lever
aligns with valve position indicators on the adapter. This shows
valve position.
APU FUEL FEED - APU FUEL SHUTOFF VALVE
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 FEED - APU FUEL SHUTOFF VALVE
APU FUEL FEED - APU FUEL SHUTOFF VALVE
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
28-25-00-004
Control
The electronic control unit (ECU) controls the APU shutoff valve.
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