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A330/A340 FLEET DSC-28-10-60 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - AUTOMATIC FUEL TRANSFERS
A330/A340 FLEET DSC-28-10-70 P 1/2
FCOM 19 AUG 10
CENTER TO INNER TANK TRANSFER
Applicable to: ,
The center tank pumps run continuously, whenever there is fuel in the center tank. Each inner tank
inlet valve controls the transfer by cycling its inner tank contents between full and approximately
2 000 kg (4 415 lb) below full. When the center tank is empty, both center tank pumps stop, and both
inner tank inlet valves close.
OUTER TO INNER TANK TRANSFER
Applicable to: ALL
The outer tank fuel is transferred to the inner tanks by gravity. Each outer tank transfer valve controls
the transfer by cycling the associated inner tanks contents between 3 500 kg (7 720 lb) and 4 000 kg
(8 830 lb). When each outer tank has been empty for 5 min, its outer tank transfer valves close.
TRIM TANK TRANSFER
Applicable to: ALL
Refer to DSC-28-10-90 GENERAL.
ECAM INDICATION
Applicable to:
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - AUTOMATIC FUEL TRANSFERS
A330/A340 FLEET DSC-28-10-70 P 2/2
FCOM 19 AUG 10
ECAM INDICATION
Applicable to:
ECAM INDICATION
Applicable to: ,
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - MANUAL FUEL TRANSFERS
A330/A340 FLEET DSC-28-10-80 P 1/2
FCOM 19 AUG 10
OUTER TO INNER TANK TRANSFER
Applicable to: ,
Transfer from the outer to inner tanks can be manually selected with the OUTR TK XFR pushbutton.
When selected ON, the outer tank fuel transfer valves, and the inner and outer inlet valves are
opened.
Note: 1. During an outer to inner tank transfer, the CTR TK pumps must be selected OFF to avoid
inadvertent fuel transfer from the center tank to outer tanks.
2. When the OUTR TK XFR pushbutton is pressed, aft transfer is inhibited.
OUTER TO INNER TANK TRANSFER
Applicable to:
Transfer from the outer to inner tanks can be manually selected with the OUTR TK XFR pushbutton.
When selected ON, the outer tank fuel transfer valves, and the inner and outer inlet valves are
opened.
Note: When the OUTR TK XFR pushbutton is pressed, aft transfer is inhibited.
CENTER TO INNER TANK TRANSFER
Applicable to: ,
Transfer from the center to inner tanks can be manually selected with the CTR TK XFR pushbutton.
When selected MAN, the inner tank inlet valves are opened and the CTR TK pumps run.
The CTR TK pumps must be selected OFF, when the :
Inner tanks are full, to manually ‐ prevent inner tank overflow.
‐ Center tank is empty.
Note: 1. When the fuel quantity of each inner tank is below 17 000 kg (37 520 lb), all center tank
fuel can be transferred without any risk of overflow.
2. When the CTR TK XFR pushbutton is pressed, aft transfer is inhibited.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - MANUAL FUEL TRANSFERS
Intentionally left blank
A330/A340 FLEET DSC-28-10-80 P 2/2
FCOM 19 AUG 10
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - CG CONTROL - TRIM TANK TRANSFER
A330/A340 FLEET DSC-28-10-90 P 1/22
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The trim tank transfer system controls the aircraft's Center of Gravity (CG).
‐ The system either transfers fuel to the trim tank (aft transfer) or from the trim tank (forward
transfer).
‐ This movement of fuel changes the aircraft's CG.
‐ When the aircraft is in cruise, the system optimizes the CG position to increase fuel economy by
reducing drag.
‐ Normal operation is automatic, but the crew can manually select a forward fuel transfer.
‐ The Fuel Control and Monitoring Computer (FCMC) calculates the aircraft's CG and compares it
to a target value. (This target depends on the aircraft's actual weight. Refer to DSC-28-10-90 AFT
CG TARGET).
‐ Based on this calculation, the FCMC determines the quantity of fuel to be moved aft or forward in
flight.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - CG CONTROL - TRIM TANK TRANSFER
A330/A340 FLEET DSC-28-10-90 P 2/22
FCOM 19 AUG 10
AFT CG TARGET
Applicable to:
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - CG CONTROL - TRIM TANK TRANSFER
A330/A340 FLEET DSC-28-10-90 P 3/22
FCOM 19 AUG 10
AFT CG TARGET
Applicable to:
A330/A340 FLIGHT CREW
OPERATING MANUAL
　
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