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The XFLOW/APUpump supplies fueltotheAPU when thePWRFUEL switch on the APU controlpanelis selected. Inthe eventof aXFLOW/APUpumpfailure, theAPU can be suppliedfuelfrom therightengine fuelfeed manifold.
Inthe eventof afire,fuelflow totheengine orAPUis terminatedbythe closure ofafuel shut-off valve whenthe associatedfire push switchlightis selected.
Flight Crew Operating Manual MASTER
CSP A-
013
FUEL SYSTEM Fuel Distribution Vol. 1 13-
40-
2
REV 56, Jan 31/03
L/R BOOST PUMP PWR FUEL
switch/lights Usedto controlAPUfuelpump.
Pressedin -
For enginestart, both boostpumps are activated. Withboth engines running, the pumps remain armed, but willautomatically come on, whenlow fuelpressure is detectedin any engine feedline.The switch/lights show ON whenthe pumps are operating.
Pressedout -
The boostpumpis
disarmed on the respective side.
INOPlight comes on to indicate that a lowpumppressure has beendetected, the respective boost pumphas not been
PUMPFAIL(amber) light Indicates thatAPUfuelpumphas failed.
SOV FAIL(amber) light Indicates that theAPUfuel shut-
off valve has failed.
ENGINE APU ENGINE
StandbyFuelFeedSystem
Figure 13--40--1
Flight Crew Operating Manual MASTER
CSP A-
013
FUEL SYSTEM Vol. 1 13-
40-
3
Fuel Distribution REV 56, Jan 31/03
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