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the boost pumps in the fuel tank that has less fuel.
Suction Operation
Suction supply from main tank No. 1 and main tank No. 2 occurs
when all the boost pumps in one tank are off and the crossfeed
valve is closed. The bypass valve in main tank No. 1 and/or
main tank No. 2 opens. This lets main tank No. 1 and/or main
tank No. 2 supply fuel to the engines. The engines can only
suction fuel from main tank No. 1 and main tank No. 2.
ENGINE FUEL FEED - OPERATION
EFFECTIVITY
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ENGINE FUEL FEED - OPERATION
EFFECTIVITY
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Purpose
The APU fuel feed system supplies fuel to the APU.
APU FUEL FEED - INTRODUCTION
EFFECTIVITY
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APU FUEL FEED - INTRODUCTION
EFFECTIVITY
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EFFECTIVITY
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General
The APU fuel feed system supplies fuel from any tank to the
APU.
GUN 001-099, 101-115
APU Fuel Feed
The center tank boost pumps or the boost pumps in main tank
No. 1 and main tank No. 2 supply fuel to the APU. If the boost
pumps are off, the APU suctions fuel from main tank No. 1.
GUN 201-999
APU Fuel Feed
The center tank boost pumps or the boost pumps in main tank
No. 1 and main tank No. 2 supply fuel to the APU. If the boost
pumps are off, the APU suctions fuel from main tank No. 1. A dc
boost pump supplies fuel to the APU when the center and main
tank boost pumps cannot supply fuel to the left fuel feed
manifold.
GUN ALL
Control
The electronic control unit (ECU) controls fuel flow to the APU.
The ECU receives inputs from these items:
* APU master switch
* Fire protection system
* APU sensors.
The ECU uses these inputs to control the APU fuel shutoff valve.
The fuel shutoff valve battery makes sure that the fuel system
always has power to close the APU fuel shutoff valve.
Fuel Supply Line and Shroud
The APU fuel feed line sends fuel from the APU fuel shutoff
valve to the APU fuel control unit.
A shroud collects fuel leaks from the APU fuel feed line. The
shroud sends the fuel overboard through a drain mast.
APU FUEL FEED - GENERAL DESCRIPTION
EFFECTIVITY
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APU FUEL FEED - GENERAL DESCRIPTION
APU FUEL FEED - GENERAL DESCRIPTION
EFFECTIVITY
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APU FUEL FEED - GENERAL DESCRIPTION
APU FUEL FEED - GENERAL DESCRIPTION
EFFECTIVITY
GUN 201-999 28-25-00
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