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Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
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
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.
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.
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual Volume 2
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.
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
ENGINE FEED SYSTEM
Fuel is provided to each engine from the two AC boost pumps. In normal operation, both boost pumps are continuously on and provide all engine fuel flow once the engine is started. The AC pumps are located in the inboard section of each wing (feed tank) and each AC pump is powered by a separate bus.
Loss of pressure at any AC boost pump causes the DC pump to come on, to provide a back up of the remaining boost pump. The DC pumps also come on automatically for take-off, based on flaps/slats position and weight on wheels logic.
The engine fuel burn schedule is automatically controlled by the FMQGC to ensure correct distribution for all airplane configurations.
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