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control panel.
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.
GF1210_007
FUEL
P P
TOTAL FUEL
13450 LBS
FUEL USED
29200LBS
5850 LBS 5400 LBS
0 LBS
2200 LBS
AUX AUX
23 °C 23 °C
32 °C 32 °C
APU
P
P
P P P P
P
P
AUTO
WING XFER
OFF
The FUEL synoptic page represents the left to right wing transfer mode of operation with both
engines running.
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 enable 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.
FUEL
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
12−10−9
TRANSFER SYSTEM (CONT'D)
Crossfeed (Cont’d)
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.
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.
GF1210_008
FUEL
P P
TOTAL FUEL
13400 LBS
FUEL USED
28600LBS
5600 LBS 5600 LBS
0 LBS
2200 LBS
AUX AUX
23 °C 23 °C
32 °C
APU
P P
LO PRESS
P
P
P
P
P
P
32 °C
XFEED SOV
FAIL
OPEN
The FUEL synoptic page 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 backup
to the wing transfer system) is to provide
means of correcting lateral C of G imbalances, by temporarily inhibiting the flow fuel from the light
side of the airplane. Fuel will then be supplied to both engines from the “heavy” side until lateral
fuel imbalance is within desired limits.
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.
FUEL
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
12−10−10
TRANSFER SYSTEM (CONT'D)
Crossfeed (Cont’d)
In the event that a lateral fuel imbalance occurs outside design limits, it will be annunciated on
EICAS, prompting the crew to take action.
Crossfeed ShutOff
Valve
Crossfeed shutoff
valve is selected
open by the switch
on the fuel control
panel.
L
WING FEED
INHIBIT
GF1210_010
FUEL
P P
TOTAL FUEL
12400 LBS
FUEL USED
29600LBS
4600LBS 5600LBS
0 LBS
2200 LBS
AUX AUX
23 °C 23 °C
32 °C 32 °C
APU
P P
P
P
P P
P
P
AUX PUMP
OFF
PRI PUMP
OFF
XFEED SOV
FAIL
OPEN
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