Source: Schiphol airport
The usable fuel capacity of the A350-900 is 141.000 litres (although in the A350 characteristic document gives a capacity of 138.000 l.) and the modification for the A350-900ULR will increase it to 165.000l.
To develop the A350-900ULR the main changes will centre on adapting fuel systems computers to increase the accessible capacity of the -900´s existing fuel tanks.
Airbus states that will also amend inert-gas distribution pipes in the wing and air-venting.
The overall modification will enable the fuel volume to rise by some 25.000l.
Source: Manuel Belleli
Some modifications will also be made to the aircraft´s aerodynamic performance, although Airbus has yet to unveil details. Maximum take-off weight will rise to 280t.
Based on the article “Extending A350-900 range may be easy win for Airbus” published in Flight International.