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P P P
P
P P
P
P
FUEL
AUX
23°C
APU
23°C
TOTAL FUEL
1O8OOLBS
54OOLBS
AUX
OLBS
54OOLBS
FUEL USED
292OOLBS
LO PRESS
32°C 32°C
LO PRESS
OFF
AUTO
WING XFER
DC Auxiliary Pump
In wing transfer demand,
commanded on by the FMQGC.
Wing Transfer Shutoff Valve
Commanded on by the FMQGC
or manually by the switch on the
fuel control panel.
GX_appx_016
For Training Purposes Only
Sept 04
Appx-33
P I LOT T R A I N I N G GU I D E
GLOBAL 5000 DIFFERENCES
APPENDIX 1
CROSSFEED
The crossfeed system permits interconnection between the left and right engine feed
lines, using a shutoff valve. This will enable both engines to be fed by either feed tank,
or alternatively, enabling a single engine to be supplied from both feed tanks.
For normal airplane operations, the crossfeed shutoff valve is closed, isolating the feed
lines and ensuring that each engine is supplied fuel only from its own side of the
airplane. Opening the crossfeed shutoff valve interconnects the feed lines, enabling
fuel to flow from one engine feed line to the other.
No automatic means of controlling the crossfeed SOV is provided, and selection has to
be made using the XFEED SOV switch on the fuel control panel.
In single engine operating mode, with the crossfeed shutoff valve opened, fuel flows
from both feed tanks via the AC primary pumps to the single engine, and fuel flow
rates from both sides of the airplane are considered essentially the same. Therefore the
airplane can be flown indefinitely without developing any significant lateral fuel
imbalance.
The FUEL synoptic page below represents the fuel crossfeed mode of operation, with
the crossfeed shutoff valve selected open, left engine shut down, left engine feed
shutoff valve closed, and the right engine running.
A secondary use of the crossfeed system (as a back-up to the wing transfer system) is
to provide means of correcting lateral C of G imbalances, by temporarily inhibiting the
flow of fuel from the light side of the airplane. Fuel will then be supplied to both
engines from the “heavy” side until lateral fuel balance is within desired limits.
P P P
P
P P
P
P
FUEL
AUX
23°C
APU
23°C
TOTAL FUEL
112OOLBS
56OOLBS
AUX
OLBS
56OOLBS
FUEL USED
286OOLBS
LO PRESS
32°C 32°C
LO PRESS
XFEED SOV
FAIL
OPEN
Engine Feed
Shutoff Valve
Commanded off
when the fire handle
is pulled.
Crossfeed Shutoff
Valve
Crossfeed shutoff
valve is selected
open by the switch
on the fuel control
panel.
GX_appx_017
P I LOT T R A I N I N G GU I D E
GLOBAL 5000 DIFFERENCES
APPENDIX 1
Appx-34 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
FUEL
AUX
23°C
APU
23°C
TOTAL FUEL
112OOLBS
56OOLBS
AUX
OLBS
56OOLBS
FUEL USED
296OOLBS
LO PRESS
32°C 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_appx_018
XFEED SOV
FAIL
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