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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.
P P P
P
P P
P
P P
P
FUEL
AUX
23°C
APU
23°C
TOTAL FUEL
372OOLBS
135OOLBS
AUX
8OOOLBS
135OOLBS
FUEL USED
52OOLBS
LO PRESS
32°C
22OOLBS
32°C
LO PRESS
Center Transfer
Pumps
GX_11_015
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
11-22 For Training Purposes Only
Sept 04
AUTO WING TRANSFER
The auto wing transfer mode is only enabled when the slat/flap handle is in the in/zero
position. In this 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 SOVs 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.
The FUEL synoptic page represents the left to right wing transfer mode of operation
with both engines running.
P P P
P
P P
P
P P
P
FUEL
AUX
23°C
APU
23°C
TOTAL FUEL
1345OLBS
585OLBS
AUX
OLBS
54OOLBS
FUEL USED
292OOLBS
LO PRESS
32°C
22OOLBS
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_11_016
For Training Purposes Only
Sept 04
11-23
P I LOT T R A I N I N G GU I D E
FUEL SYSTEM
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 P
P
FUEL
AUX
23°C
APU
23°C
TOTAL FUEL
134OOLBS
56OOLBS
AUX
OLBS
56OOLBS
FUEL USED
286OOLBS
LO PRESS
32°C
22OOLBS
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
中国航空网 www.aero.cn
航空翻译 www.aviation.cn
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