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Refueling Distribution
Refer to Refuel/Defuel Schematic for component location, recognition and operation.
All fuel tanks can be refueled either automatically (by the FMQGC) or manually (by the
refuel/defuel panel). The recommended pressure is 50 psig. for pressure refueling.
A balance line in each tank is used during refueling to transfer fuel to the most outboard section of
the wing.
The filling sequence of the wing compartment during pressure refueling is as follows:
· Cell 2 is filled directly by the refuel system, fuel flows inboard by gravity into:
· Cell 1, which is the inboard section including the feed tank. After inboard cells 1 and 2 are
completely filled:
· Cell 3 is filled to capacity by overflow of cell 2 fuel through the balance tube connecting cells
2 and 3.
High level sensors installed in each tank automatically close the refuel/defuel SOVs, if the
maximum fuel level capacity is reached. Relief valves augment the normal vent system to prevent
overpressure in case of overfilling a tank.
As with the wing tanks, automatic refueling of the center tank is controlled by the FMQGC, with
automatic shutoff commanded by the high level sensor.
FUEL
Rev 3, Apr 25, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
12−10−21
REFUEL/DEFUEL SCHEMATIC
FGF1210_020
CELL 1 CELL 2 CELL 3
RV
RV
RV
SHUTOFF VALVES
Refuel/
Defuel
Panel TO
FMQGC
BALANCE
TUBE
BAFFLED RIBS
RELIEF
VALVE
SUCTION DEFUEL
CHECK VALVE
DEFUEL SHUTOFF
VALVE
CROSSFEED
VALVE
CENTER TANK
REFUEL/DEFUEL CHECK
VALVE
SINGLE POINT
REFUEL ADAPTER
H H
H H
HIGH LEVEL
SENSOR
REFUEL/DEFUEL
MANIFOLD
PRESSURE REFUEL
CHECK VALVE
Left main refuel
Fuel distribution lines
Right main refuel
Center refuel/defuel
Main defuel
LEGEND
FUEL
Flight Crew Operating Manual Rev 2A, Apr 11, 2005
CSP 700−5000−6
Volume 2
12−10−22
FUEL RE-CIRCULATION SYSTEM
The fuel re−circulation system is designed to prevent the bulk fuel temperature from reaching the
freezing point by re−circulating heated fuel to the wing fuel tanks. The FMQGC will turn on recirc
when the altitude is > 34,000 feet, AND the bulk temperature drops below −20°C, or average
temperature drops below −9°C, and turn off recirc when the bulk temperature reaches 5°C or altitude
is < 33,800 feet, or either engine is turned off. It will turn both sides on or off at the same time.
Cold fuel circulated through the Fuel Cooled Oil Cooler (FCOC) where the Heat from the engine oil is
transferred to the fuel. The Fuel Return To Tank (FRTT) valve allows the heated fuel to return to the
wing fuel tank.
When the FRTT valve is open, fuel returns to the wing tank through the recirculation line. Heated fuel
is then distributed to the number 1 and 2 cell of the wing fuel tank. No fuel is distributed to the
number 3 cell as it will have emptied before the local fuel temperature reaches −40°C (F). The
recirculation line is fitted with a check valve to prevent crossflow or fuel propagation due to a ruptured
line.
The wing fuel tanks are fitted with many fuel temperature sensors; the left wing has two and the right
wing has three. With the Fuel Recirculation OFF, the Fuel Management and Quantity Gauging
Computer (FMQGC) reads all temperature sensor but will display only the lowest temperature. When
the Fuel Recirculation system is ON, the FMQGC computer reads the inboard temperature sensor as
it will be the one who reads the highest temperature.
Operation of the Fuel Recirculation System is allowed only during cruise flight above 34,000 feet.
Display of system status is provided through EICAS messages. A L (R) FUEL RECIRC FAIL caution
message will be displayed on the EICAS status page when the FRTT valve is not in the commanded
or allowed position. Finally, the L (R) FUEL RECIRC OFF status message will be displayed when the
crew selects system off.
The FUEL HI TEMP caution message is posted when the bulkhead fuel temperature exceeds 54°C
when the Fuel Recirculation System is inoperative. To prevent the system from operating above the
freezing level, the set point has been reduced to 10°C when the system is selected on.
FUEL
Rev 2A, Apr 11, 2005 Flight Crew Operating Manual
CSP 700−5000−6
Volume 2
12−10−23
FUEL RE-CIRCULATION SYSTEM (CONT'D)
FGF1210_019
Bulk Fuel
Temperature
Heated Fuel
　
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