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AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - CG CONTROL - TRIM TANK TRANSFER
A330/A340 FLEET DSC-28-10-90 P 4/22
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 5/22
FCOM 19 AUG 10
NORMAL OPERATION
Applicable to: ALL
Automatic CG control :
‐ Begins during climb to FL 255.
‐ Ends at descent to FL 245, or when the FMGS time to destination is less than 35 min (or less than
75 min in the even of trim tank forward transfer pump failure).
Note: 1. The trim pipe isolation valve and the trim tank isolation valve are closed during takeoff
and landing. It is possible to reopen them, when the landing gear is up and the slats are
retracted (or when the MODE SEL switch is set at REFUEL on the REFUEL panel).
2. If the FMGC detects a CG that is too far aft, then the target will automatically be
moved forward by 1.5 %. The target also moves forward 1.5 % in the case of FQI data
degradation, or if ZFCG/ZFW have not been entered or need to be reinitialized in flight
(modifying CG/GW via the MCDU).
3. The above-mentioned CG target alterations should be added together.
AFT FUEL TRANSFER
Applicable to:
GENERAL
In flight, the FCMC only starts an AFT fuel transfer, when all of the following conditions are met :
‐ Landing gear is retracted.
‐ Slats are retracted.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - CG CONTROL - TRIM TANK TRANSFER
A330/A340 FLEET DSC-28-10-90 P 6/22
FCOM 19 AUG 10
‐ Trim tank is not full.
‐ Inner tank's fuel quantity is above 6 250 kg (13 790 lb).
‐ Aircraft is above FL 255.
‐ Aircraft CG is not on target.
Normally, only one aft fuel transfer occurs per flight. However, if the CG in cruise is ahead of the
target by more than 2 % , and the trim tank quantity is below 3 000 kg (6 620 lb), an additional aft
transfer will occur. An aft transfer stops when the :
‐ Computed CG = Target CG - 0.5 % , or
‐ Trim tank high level sensor becomes wet, or
‐ Inner tank's fuel quantity reaches 6 250 kg (13 790 lb), or
‐ T TANK MODE pushbutton is set to FWD, or
‐ Fuel transfer from the center or outer tanks to the inner tanks is manually selected.
‐ Fuel automatically transfers from the center tank to the inner tanks.
Fuel for trim tank aft transfer is provided by the center TK, when it contains fuel, or by the inner
tanks when the center tank is empty. In the latter case, XFEED 2 and 3 valves are open. If, during
the transfer, the inner tanks are unbalanced by more than 500 kg (1 100 lb), the transfer will stop
on the lightest side, and the related aft transfer valve and XFEED valve will automatically close
until fuel balance is restored.
Applicable to:
GENERAL
In flight, the FCMC only starts an AFT fuel transfer, when all of the following conditions are met :
‐ Landing gear is retracted.
‐ Slats are retracted.
‐ Trim tank is not full.
‐ Inner tank's fuel quantity is above 6 250 kg (13 790 lb).
‐ Aircraft is above FL 255.
‐ Aircraft CG is not on target.
Normally, only one aft fuel transfer occurs per flight. However, if the CG in cruise is ahead of the
target by more than 2 % , and the trim tank quantity is below 3 000 kg (6 620 lb), an additional aft
transfer will occur. An aft transfer stops when the :
‐ Computed CG = Target CG - 0.5 % , or
‐ Trim tank high level sensor becomes wet, or
‐ Inner tank's fuel quantity reaches 6 250 kg (13 790 lb), or
‐ T TANK MODE pushbutton is set to FWD, or
‐ Fuel transfer from the outer tanks to the inner tanks is manually selected.
Fuel for trim tank aft transfer is provided by the inner tanks through the engine feed pumps. If,
during the transfer, the inner tanks are unbalanced by more than 500 kg (1 100 lb), the transfer will
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - CG CONTROL - TRIM TANK TRANSFER
A330/A340 FLEET DSC-28-10-90 P 7/22
FCOM 19 AUG 10
stop on the lightest side, and the related aft transfer valve will automatically close until fuel balance
is restored.
Applicable to: ,
GENERAL
In flight, the FCMC only starts an AFT fuel transfer, when all of the following conditions are met :
‐ Landing gear is retracted.
‐ Slats are retracted.
‐ Trim tank is not full.
‐ Inner tank's fuel quantity is above 6 250 kg (13 790 lb).
‐ Aircraft is above FL 255.
‐ Aircraft CG is not on target.
Normally, only one aft fuel transfer occurs per flight. However, if the CG in cruise is ahead of the
　
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