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5816 LBS
AUX AUX
23 °C 23 °C
P
P
P
APU
32 °C
P
P
P
32 °C
P P
The FUEL synoptic page represents the center tank transfer operation with both engines running.
Wing Transfer
The wing transfer system permits fuel to be pumped from either side of the airplane to the other,
using the DC auxiliary pumps and motor operated shutoff valves.
The wing transfer system provides a means of correcting lateral fuel imbalance. It may be used in
automatic mode via FMQGC or manual mode as selected by the cockpit fuel control panel. Fuel
imbalance at a predetermined value will be annunciated on the EICAS display in the form of a
caution message.
FUEL
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
12−10−7
TRANSFER SYSTEM (CONT'D)
Auto Wing Transfer
The auto wing transfer mode is only enable when the slat/flap handle is in the In the wing transfer
automatic mode, the FMQGC will correct lateral fuel imbalances of 400 pounds on ground and in
flight. The FMQGC will control and operate the DC auxiliary pumps and wing transfer SOV’s as
necessary to pump fuel from the feed tank into the opposite wing. Once commanded on, the wing
transfer system remains on until lateral fuel imbalance is zero.
In the event of a center tank transfer pump failure, fuel will be transferred from the operating center
tank transfer pump to its respective wing tank. The automatic wing transfer system will maintain
lateral fuel balance, to ensure that fuel contained in the center tank is available to both engines.
Manual Wing Transfer
In manual mode, the wing transfer system is controlled using the fuel WING XFER switch. Once
selected, the wing fuel transfer continues until the WING XFER switch is selected OFF on the fuel
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.
FGF1210_007
AUTO
WING XFER
OFF
FUEL
TOTAL FUEL
28300 LBS
FUEL USED
7316 LBS
14900 LBS 13400 LBS
0 LBS
AUX AUX
23 °C 23 °C
P
P
P P
APU
32 °C
P
P
P
32 °C
P
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
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
12−10−8
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.
FGF1210_008
XFEED SOV
FAIL
OPEN
FUEL
TOTAL FUEL
28300 LBS
FUEL USED
7316 LBS
14900 LBS 13400 LBS
0 LBS
AUX AUX
23 °C 23 °C
P
P
P P
APU
32 °C
P
P
P
32 °C
P
LO PRESS
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
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