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Lateral balance between left and right main tanks is controlled automatically by the Fuel Management and Quantity Gauging Computer (FMQGC) or manually through switch selections in the flight compartment.
FEED TANKS
DC PUMPS (START, EMERGENCY AND WING TRANSFER)
AC MOTOR PUMPS (TRANSFER)
AC MOTOR PUMPS CENTER TANK (ENGINE FEED) ENGINE DRIVEN PUMPS
MAIN WING TANK
FGF1210_001
Flight deck control is provided on the overhead panel and fuel quantity and warnings are displayed on EICAS.
A single point pressure refuel/defuel adapter is provided which is connected to a manifold containing shutoff valves. Pressure refueling can be done either automatically or manually. Gravity filling is provided for each tank.
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
GENERAL (CONT'D)
A dual channel FMQGC continuously monitors the following:
.
Fuel quantity indicating
.
Left, right engine and APU feed
.
Wing to wing balance (wing XFER)
.
Center tank transfer
.
Refuel/defuel
.
Fuel recirculation
Any fault detected by the fuel system computer is annunciated on Engine Indication and Crew Alerting System (EICAS), in the form of a visual and/or aural alert and/or maintenance diagnostics.
FUEL SPECIFICATIONS
For information on fuel additives, temperature limitations and approved fuels, refer to Airplane Flight Manual (AFM) CSP 700.5000.1 . LIMITATIONS Chapter.
Fuel remaining in a tank when the appropriate fuel quantity indicator reads zero is not usable. Refer to the AFM CSP 700.5000.1 for exact tank and total fuel quantity.
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
FUEL SYSTEM SYNOPTIC PAGE
The FUEL synoptic page provides an overview of system status, as represented below with both left and right engines running and no transferring of fuel taking place.
CENTER TRANSFER
DC AUXILIARY PUMPS
AC BOOST PUMPS
FGF1210_002
AC Boost Pumps
Two AC boost pumps, also referred to as primary boost pumps, are located in each feed tank. They normally supply fuel to the engines in all airplane ground and flight mode operations. Each pump is capable of maintaining an engine (fuel demand) in all modes of engine operation. The two pumps are continuously on, whenever the engine is operating and AC power is available. Both boost pumps (two on each side) may be inhibited by selection of one of the individual switches on the fuel control panel. The boost pumps are controlled automatically through the Alternating Current Power Center (ACPC), when a fuel command is received.
DC Auxiliary Pumps
DC powered auxiliary pumps (AUX pumps) one in each feed tank, are used for the following:
.
APU starting
.
Wing to wing transferring of fuel
.
Engine feed in the event of an AC boost pump failure
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