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REPEATER
Displayed in the PRESEL window of the external refuel/defuel panel when two panels are powered ON. The panel located in the flight compartment is in control and the outside panel provides quantity display only.
Dashes ( _ _ _ _ _ _ ) will be displayed for fuel quantity if the computed value is invalid.
FAILED
Displayed in the PRESEL window if the refuel/defuel panel is not functional.
FMQGC . FAILURE
FMQGC will be displayed in the TOTAL window and FAILURE in the PRESEL window if the refuel/defuel panel is not communicating with the fuel computer.
Volume 2 Flight Crew Operating Manual Rev 3, Apr 25, 2005
REFUEL/DEFUEL PANEL (CONT'D)
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.
Rev 3, Apr 25, 2005 Flight Crew Operating Manual Volume 2
REFUEL/DEFUEL SCHEMATIC
REFUEL/DEFUEL MANIFOLD
RELIEF VALVE CROSSFEED VALVE CHECK VALVE
Left main refuel Fuel distribution lines Right main refuel Center refuel/defuel Main defuel LEGEND
FGF1210_020
Volume 2 Flight Crew Operating Manual Rev 2A, Apr 11, 2005
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.
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