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open by the switch
on the fuel control
panel.
GX_11_017
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
11-24 For Training Purposes Only
Sept 04
CAUTION
The possibility of engine flameout could occur if the
crossfeed valve is not opened prior to inhibiting the fuel
pumps.
In this operating mode, the crossfeed valve is selected open via the XFEED SOV
switch on the fuel control panel. The fuel pumps on the light side of the airplane are
turned off, using the applicable AUX PUMP and PRI PUMP switches. Fuel will then
be supplied from the heavy side of the airplane only, thereby correcting the lateral fuel
imbalance. Crossfeed continues in this mode until the crew deselects the switches after
lateral balance is achieved.
NOTE
It is important that the crew monitor system operation in this
mode, since crossfeed will continue until manually deselected.
In the event that a lateral fuel imbalance occurs outside design limits, it will be
annunciated on EICAS, prompting the crew to take action.
The FUEL synoptic page below represents the fuel crossfeed mode (backup) of
operation. The system is shown with the crossfeed shutoff valve selected open, left
auxiliary pump inhibited, left forward and aft boost pumps inhibited, and both engines
running.
P P P
P
P P
P
P P
P
FUEL
AUX
23°C
APU
23°C
TOTAL FUEL
124OOLBS
46OOLBS
AUX
OLBS
56OOLBS
FUEL USED
296OOLBS
LO PRESS
32°C
22OOLBS
32°C
LO PRESS
L
WING FEED
INHIBIT
AUX PUMP
OFF
PRI PUMPS
OFF
Crossfeed Shutoff
Valve
Crossfeed shutoff
valve is selected
open by the switch
on the fuel control
panel.
GX_11_018
XFEED SOV
FAIL
OPEN
For Training Purposes Only
Sept 04
11-25
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
AFT TRANSFER
Fuel contained in the aft tank is retained until late in the flight, in order to maintain a
favorable aft center of gravity (C of G).
The aft transfer schedule is normally controlled automatically by the FMQGC. Fuel
can also be transferred or inhibited manually from aft tank to wing tank, using the AFT
XFER switch on the fuel control panel, if desired.
Aft transferring of fuel is achieved using the two AC boost pumps and two shutoff
valves. Each of the two transfer pumps in the system has sufficient capacity to
maintain the transfer schedule in the event of a failure of one of the pumps.
When the aft transfer system is commanded to operate, the aft tank refuel transfer
valve and the aft transfer pump come on. Fuel is then pumped by the aft transfer pump,
into its respective feed tank.
The FUEL synoptic page above represents the fuel aft transfer mode of operation, with
both engines running. The system is shown transferring fuel from the aft tank bladders
to their respective wing tanks.
P P P
P
P P
P
P P
P
FUEL
AUX
23°C
APU
23°C
TOTAL FUEL
9OOOLBS
4OOOLBS
AUX
OLBS
4OOOLBS
FUEL USED
32OOOLBS
LO PRESS
32°C
1OOOLBS
32°C
LO PRESS
AFT Transfer Pump
In the AUTO mode, the
transfer schedule is
controlled by the FMQGC.
Manual mode ON or OFF
transfers or inhibits fuel
transfer to the wings.
GX_11_019
AFT XFER
AUTO
OFF ON
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
11-26 For Training Purposes Only
Sept 04
APU FUEL FEED
The APU start capability is normally provided by the DC AUX pump(s). The fuel
supplied to the APU is taken from the right engine feed line. The APU can also be fed
from the left engine feed line using the left DC AUX pump (powered by DC ESS bus)
and opening the crossfeed shutoff valve (BATT bus). A motor operated fire shutoff
valve is used in the APU feed line, in order to isolate the flow of fuel to the APU in
case of a fire or rotor burst.
The FUEL synoptic page top view represents the APU during the starting sequence,
with the DC pump running and battery power only as the single source of electrical
power. In the lower view, the APU is fed from the right engine feed line using the AC
pumps.
P P P
P
P P
P
P P
P
FUEL
AUX
23°C
APU
23°C
TOTAL FUEL
384OOLBS
146OOLBS
AUX
92OOLBS
146OOLBS
FUEL USED
3OOLBS
LO PRESS
32°C
OLBS
32°C
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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