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OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - CG CONTROL - TRIM TANK TRANSFER
A330/A340 FLEET DSC-28-10-90 P 15/22
FCOM 19 AUG 10
Applicable to:
GENERAL
The FCMC sends a forward fuel transfer signal, if one of the following conditions are met :
‐ The calculated CG = Target. It stops when the computed CG = The target CG - 0.5 %.
‐ The fuel contents of one of the two inner tanks decreases to 4 000 kg (8 830 lb). Forward fuel
transfer stops, when the fuel content reaches 5 000 kg (11 030 lb)
‐ The FMGS sends a time-to-destination signal below the threshold, or the aircraft descends
below FL 245. In this case, transfer is continuous but is controlled by the inner tank high levels
to prevent overflow.
‐ In electrical emergency configuration.
A forward transfer is normally directed to the inner tanks.
In normal operations, a forward transfer is performed by the trim tank forward transfer pump. The
pump starts to operate, when both the landing gear and the slats are retracted, as long as there is
fuel in the trim tank. It operates continuously during the flight, until the trim tank is empty, or the T.
TANK FEED selector is set to ISOL.
Note: The running trim tank forward transfer pump has no effect on the aft transfer, since the
TRIM TK ISOL VALVE is normally closed during this transfer.
In the event of pump failure, forward transfer occurs by gravity, through the trim tank non-return
valve. The FCMC :
‐ Inhibits the forward transfer by closing the TRIM PIPE ISOL VALVE, when the aircraft pitch
exceeds 3.4 ° for more than one minute.
‐ Restarts the forward transfer, when the aircraft attitude is lower than 3.4 ° for more than one
minute.
Applicable to: ,
GENERAL
The FCMC sends a forward fuel transfer signal, if one of the following conditions are met :
‐ The calculated CG = Target. It stops when the computed CG = The target CG - 0.5 %.
‐ The fuel contents of one of the two inner tanks decreases to 4 000 kg (8 830 lb). Forward fuel
transfer stops, when the fuel content reaches 5 000 kg (11 030 lb)
‐ The FMGS sends a time-to-destination signal below the threshold, or the aircraft descends
below FL 245. In this case, transfer is continuous but is controlled by the inner tank high levels
to prevent overflow.
‐ The jettison �� system is set to the open position.
‐ In electrical emergency configuration.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - CG CONTROL - TRIM TANK TRANSFER
A330/A340 FLEET DSC-28-10-90 P 16/22
FCOM 19 AUG 10
Note: If the center tank contains fuel and the CG is forward of 32 % MAC, the transfer will be
completed in two steps :
‐ When the center tank quantity reaches 17 000 kg (37 520 lb), the trim tank is
decreased to 2 400 kg (5 290 lb).
‐ When the center tank is empty, the trim tank will be emptied.
A forward transfer is normally directed to the inner tanks, and may be directed to the center tank,
when it is not empty. In emergency electrical configuration, the forward transfer is always directed
to the inner tanks.
In normal operations, a forward transfer is performed by the trim tank forward transfer pump. The
pump starts to operate, when both the landing gear and the slats are retracted, as long as there is
fuel in the trim tank. It operates continuously during the flight, until the trim tank is empty, or the T.
TANK FEED selector is set to ISOL.
Note: The running trim tank forward transfer pump has no effect on the aft transfer, since the
TRIM TK ISOL VALVE is normally closed during this transfer.
In the event of pump failure, forward transfer occurs by gravity, through the trim tank non-return
valve. The FCMC :
‐ Inhibits the forward transfer by closing the TRIM PIPE ISOL VALVE, when the aircraft pitch
exceeds 3.4 ° for more than one minute.
‐ Restarts the forward transfer, when the aircraft attitude is lower than 3.4 ° for more than one
minute.
Applicable to: ,
CENTER TANK EMPTY
‐ Fuel is transferred from the trim tank to the inner tanks.
‐ If an inner tank reaches the high level, the related inlet valve closes to prevent tank overflow.
‐ It reopens when the inner tank quantity reaches 2 000 kg (4 415 lb) below high level.
Applicable to: ,
CENTER TANK NOT EMPTY
Fuel is transferred from the trim tank to the center tank.
A330/A340 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
FUEL
DESCRIPTION - CG CONTROL - TRIM TANK TRANSFER
A330/A340 FLEET DSC-28-10-90 P 17/22
FCOM 19 AUG 10
Applicable to:
ECAM INDICATION
Applicable to: ,
ECAM INDICATION
A330/A340 FLIGHT CREW
　
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