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The FUEL synoptic page represents the fuel crossfeed mode (backup)
of operation. The system
is shown with the crossfeed shutoff
valve selected open, left auxiliary pump inhibited, left forward
and aft boost pumps inhibited and both engines running.
Aft Transfer
Fuel contained in the aft tank is retained until late in the flight, in order to maintain a favorable aft
centre of gravity (C of G).
The aft transfer schedule is normally controlled automatically by the FMQGC. Fuel can also be
transferred or inhibited manually from aft tank to wing tank, using the AFT XFER switch on the fuel
control panel, if desired.
Aft transferring of fuel is achieved using the two AC boost pumps and two shutoff
valves. Each of
the two transfer pumps in the system has sufficient capacity to maintain the transfer schedule in
the event of a failure of one of the pumps.
FUEL
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
12−10−11
TRANSFER SYSTEM (CONT'D)
Aft Transfer (Cont’d)
When the aft transfer system is commanded to operate, the aft tank refuel transfer valve and the
aft transfer pump come on. Fuel is then pumped by the aft transfer pump into its respective feed
tank.
Aft Transfer Pump
In the AUTO mode, the
transfer schedule is controlled
by the FMQGC. Manual mode
ON or OFF transfers or inhibits
fuel transfer to the wings.
GF1210_011
FUEL
TOTAL FUEL
9000 LBS
FUEL USED
32000LBS
4000LBS 4000LBS
0 LBS
1000 LBS
AUX AUX
23 °C 23 °C
32 °C 32 °C
APU
P P
P
P
P P
P
P
P P
AUTO
AFT XFER
OFF ON
The FUEL synoptic page represents the fuel aft transfer mode of operation, with both engines
running. The system is shown transferring fuel from the aft tanks to their respective wing tanks.
FUEL
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
12−10−12
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.
Engine start capability and relight is provided by using the DC Auxiliary (AUX) pumps located in both
feed tanks. These DC pumps will turn off as AC electrical power becomes available and the AC
boost pumps are operating.
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 takeoff,
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.
The engine fuel burn sequence is as follows:
· Fuel from the wing tanks will burn first,
· When the wing tanks get below 93%, fuel transfers from the center tank to the wing tank until it
is at or above 97%,
· When the center tank empties, fuel from the wing tanks continue to burn,
· When either wing tank reaches 5500 lb, fuel transfers from the aft tank,
· Once the aft tank is empty, the wing tanks will continue to burn the remaining fuel.
Effectivity:
· Airplanes 9002, 9004 thru 9082 not incorporating Service Bulletin:
· SB 700−28−033, Fuel Management and Quantity Gauging System (FMQGS) − FMQGS
Computer Change to Part No. GP546−1501−5.
The engine fuel burn sequence is as follows:
· Fuel from the wing tanks will burn first,
· When the wing tanks get below 93%, fuel transfers from the center tank to the wing tank until
it is at or above 97%,
· When the center tank empties, wing tank continue to burn,
· When either wing tank reaches 4000 lb, fuel transfers from the aft tank,
· Once the aft tank is empty, the wing tanks will continue to burn the remaining fuel.
FUEL
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
12−10−13
ENGINE FEED SYSTEM (CONT'D)
Engine Feed System Indication
The left FUEL synoptic display represents the engine starting mode of operation with the right DC
pump running. In this scenario, the right engine is starting using the battery as the only source of
electrical power, Auxiliary Power Unit (APU) and left engine are off. The right FUEL synoptic
display represents the right engine on speed and electrical AC power established.
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