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· Left, right engine and APU feed.
· Wing to wing balance (wing XFER).
· Centre tank transfer.
· AFT tank fuel transfer.
· Refuel/defuel.
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 Flight Crew
Operating Manual (FCOM) CSP 700−6 Vol 1 − LIMITATIONS Chapter.
Fuel remaining in a tank when the appropriate fuel quantity indicator reads zero is not usable. The
figures below are approximate values only. Refer to the FCOM CSP 700−6 Vol 1 for exact tank and
total fuel quantity.
Left main tank 14,900 lb (6,757 Kg)
Right main tank 14,900 lb (6,757 Kg)
Centre tank 11,000 lb (4,989 Kg)
AFT tank 2,200 lb (997 Kg)
Total 43,000 lb (19,500 Kg)
FUEL
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
12−10−2
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.
DC AUXILIARY PUMPS
AC BOOST PUMPS
CENTRE TRANSFER
PUMP
AFT TRANSFER PUMPS
GF1210_002
FUEL
P P
TOTAL FUEL
42800 LBS
FUEL USED
100 LBS
14700 LBS 14700 LBS
11200 LBS
2200 LBS
AUX AUX
23 °C 23 °C
32 °C 32 °C
APU
P
P
P P P
P
P
P
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 Centre (ACPC), when a fuel command is received.
DC Auxiliary Pumps
DC powered Auxiliary Pumps (AUX pumps) one in each feed tank, are used for engine and APU
starting and wing to wing transferring of fuel when requested. The AUX pumps will come on
automatically in support of engine feed in the event of an AC boost pump failure. During takeoff
and landing the pumps will also come on automatically with engines on and at least one of the
following: flaps > 0°, landing gear down and in flight or low wing fuel condition (600 lbs each wing).
Each AUX pump may be inhibited by selecting off a switch on the fuel control panel.
NOTE
When an AUX pump is used for wing transfer mode of operation and
an AC pump fails, priority is given to the engine feed system and the
automatic wing transfer operation will be inhibited.
The pumps are automatically controlled by the Secondary Power Distribution Assembly (SPDA).
FUEL
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
12−10−3
FUEL SYSTEM SYNOPTIC PAGE (CONT'D)
Aft Transfer Pumps
Two aft transfer pumps and associated shutoff
valves are used to transfer fuel from the aft fuel
tanks to the wing tanks. Transfer is scheduled by the fuel computer or by a switch selection on the
fuel control panel.
Centre Transfer Pumps
Two centre transfer pumps (controlled by the FMQGC) are used to transfer fuel from the centre
tank to the main wing tank.
FUEL CONTROL PANEL
The fuel control panel is located on the overhead panel in the flight compartment. The fuel control
panel defines the operational modes, component controls and component inhibits.
The fuel control panel has switches, which when selected, override the automatic control of certain
components within the fuel system. Switch selections from this panel are sent to the ACPC. The
ACPC will then control the system from the inputs received from the panel. The switch lamps come
on in combination with certain EICAS messages, which represent the panel configuration or failure
within a given system.
GF1210_003
selection − Provides a means of transferring fuel from one
wing to the other. Controlled by the FMQGC.
selection − A left to right or a right to left selection,
provides a means of transferring fuel (in the direction of the arrow) from
one wing tank to the other.
selection − Provides a method of inhibiting wing to wing transfer.
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