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The FMQGC will start the applicable center transfer pump(s) when each individual wing tank reaches approximately 93% of its fuel tank capacity. The FMQGC will automatically stop the center transfer pump(s) when the respective wing tank reaches greater than 97% of its fuel tank capacity.
CENTER TRANSFER PUMPS
FGF1210_006
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.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
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
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.
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