Fuel is simultaneously jettisoned only from the trim and the center tanks.
Fuel is simultaneously jettisoned from the trim, inner and the center tanks.
The fuel system is controlled by:
After refueling to maximum tank capacity, fuel can expand by:
Electrical power requirements for refueling are:
Maintenance panel - The END light flashes when:
With tanks nearly empty, time for refueling all the tanks of the aircraft is approximately:
X-FEED valves 1 and 2 open in the event of aft transfer from the inner tanks.
X-FEED valves 2 and 3 open in the event of aft transfer from the inner tanks.
The Airbus A340 fuel system:
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. Based on this calculation, the FCMC determines the quantity of fuel to be moved aft or forward in flight.
The A340 fuel system inner tanks:
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There are two fuel pumps in each collector cell. They are normally selected On and:
Refueling can be accomplished:
As long as FUEL JETTISON p/b are selected ON:
Magnetic level indicators are fitted in the lower surfaces of the center and wing tanks to allow the manual measurement of each tank's fuel quantity.
In case of "ALL ENGINES FLAME OUT":
In normal conditions, the automatic control of CG is starting:
In normal operation, the automatic control of CG is ended:
Inner Tank Pumps - During normal operation, all main pumps run. If a main pump fails, or is switched off, then the standby pump of that inner tank runs. With the crossfeed valves open, one pump is capable of supplying all four engines in cruise.
When a tank fuel temperature is displayed amber:
Once refueling is finished, the END light flashes first and then stays on.
Once refueling is finished, the END light stays on.
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