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FUEL
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
12−10−6
TRANSFER SYSTEM
Fuel contained in the centre tank and the aft fuselage tank cannot be fed directly to the engine, but
must be first delivered to the feed tanks by the transfer pumps. The normal sequence of fuel usage is
to transfer centre tank fuel into the wings as required to keep the wings full during climb and cruise
while holding the aft fuselage tank full.
After depletion of centre tank fuel quantity, fuel continues to be burned from the wing tanks until
5500 lbs of fuel remains in either wing tank, at which point, transfer of fuel from the aft tank to the
feed tanks is initiated. The transfer from the aft tank is then continuous until the aft tank is empty.
When the aft fuselage tank fuel is depleted, no further transfer of fuel is required, since all remaining
fuel is contained in the wing tanks.
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.
After depletion of centre tank fuel quantity, fuel continues to be burned from the wing tanks until
4000 lbs of fuel remains in either wing tank, at which point, transfer of fuel from the aft tank to the
feed tanks is initiated. The transfer from the aft tank is then continuous until the aft tank is empty.
When the aft fuselage tank fuel is depleted, no further transfer of fuel is required, since all remaining
fuel is contained in the wing tanks.
Control of fuel transfer from the centre and aft tanks is normally under control of the fuel computer.
Manual override is provided to command transfer of aft tank fuel into the feed tanks via the fuel
control panel. There is no manual override for the centre tank transfer system.
FUEL
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
12−10−7
TRANSFER SYSTEM (CONT'D)
Centre Transfer
Fuel transfer from the centre tank to wing tank is completely automatic through the control of the
FMQGC. The FMQGC monitors the fuel level and quantities in the wing tank (using fuel probes,
compensators, densitometers and temperature sensors) to control fuel transfer from the centre
tank to the wing tanks. Fuel will be transferred from the centre tank and delivered to the wing feed
tanks, through the use of two centre transfer pumps.
The FMQGC will start the applicable centre transfer pump(s) when each individual wing tank
reaches approximately 93% of its fuel tank capacity. The FMQGC will automatically stop the
centre transfer pump(s) when the respective wing tank reaches greater than 97% of its fuel tank
capacity.
CENTRE TRANSFER
PUMPS
GF1210_006
FUEL
P P
TOTAL FUEL
37200 LBS
FUEL USED
5200 LBS
13500 LBS 13500 LBS
8000 LBS
2200 LBS
AUX AUX
23 °C 23 °C
32 °C 32 °C
APU
P
P
P P P P
P
P
The FUEL synoptic page represents the centre 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.
Auto Wing Transfer
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 ± 50 pounds.
In the event of a centre tank transfer pump failure, fuel will be transferred from the operating centre
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 centre tank is available to both engines.
FUEL
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
12−10−8
TRANSFER SYSTEM (CONT'D)
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
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