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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.
FUEL
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
12−10−23
REFUEL/DEFUEL PANEL (CONT'D)
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.
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.
The aft and centre tanks will be refuelled simultaneously (automatically by the FMQGC) to
maintain centreofgravity
(C of G) limits.
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 centre tank is controlled by the FMQGC, with
automatic shutoff
commanded by the high level sensor. Automatic refueling of the aft tank is
controlled by the FMQGC, with automatic shutoff
commanded by the high level sensor.
Fuel ReCirculation
System (On airplanes with SB 700−28−034 incorporated)
The Fuel ReCirculation
system is designed to prevent the bulk fuel temperature from reaching the
freezing point by recirculating heated fuel to the wing fuel tank. The system is operated through
the L and R RECIRC switches on the Fuel Control panel.
Heat is generated by the engine oil cooling system. 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.
Each FRTT valve is electrically controlled and fuel pressure operated. The aircraft main fuel pump
pressure is insufficient to activate the FRTT valve, thus the engine must be running for the FRTT
valve to open.
FUEL
Flight Crew Operating Manual REV 41, Jul 08, 2004
CSP 700−6
Volume 2
12−10−24
REFUEL/DEFUEL PANEL (CONT'D)
Fuel ReCirculation
System (On airplanes with SB 700−28−034 incorporated) (Cont’d)
GF1210_024
Bulk Fuel
Temperature
Heated Fuel
Temperature Sensor
FUELRETURNTOTANK
CELL3
CELL1
CELL2
CENTRE TANK
CENTRE TRANSFER PUMP
AUXILIARY
DC PUMP
WING TRANSFER
SHUTOFF
VALVE
P
P
P
P
TS
P
P
P
P
P P
TS
TS
TS
TS
AFT TRANSFER PUMP
RECIRCULATION
AFT TRANSFER LINE
ENGINE FEED
MAIN AC PUMPS
AFT TRANSFER
SHUTOFF
VALVE
AFT TANK
FCOC FCOC
TS
LEGEND
VALVE
LINE
SHUTOFF
VALVE
FUEL
REV 41, Jul 08, 2004 Flight Crew Operating Manual
CSP 700−6
Volume 2
12−10−25
REFUEL/DEFUEL PANEL (CONT'D)
Fuel ReCirculation
System (On airplanes with SB 700−28−034 incorporated) (Cont’d)
The FRTT valves are powered by their dedicated circuit breakers on DC BUS 1 and 2.
Effectivity:
· Airplanes 9002 thru 9122 not incorporating Service Bulletin:
· SB 700−28−039, Distribution − Permanent Wiring Configuration for the Fuel
ReCirculation
System Following Power Source Change.
The FRTT valve circuit breakers are tied to the Refuel/Defuel Control Panel circuit breakers on
the APU Battery Bus.
When the FRTT valve is open, fuel returns to the wing tank through the recirculation
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