Все A350 будут оснащены разными вариантами нового двигателя Trent XWB фирмы "Rolls-Royce". На уровне моря они будут развивать тягу от 330 до 420 кН. Первые испытания новой силовой установки на самолете A380, принадлежащем "Airbus", начались в феврале 2012 года.
The Rolls-Royce Trent XWB-84 undergoing cold weather testing on A380 F-WWOW at Iqaluit, Canada. The engine was certified in February 2013.

MSN5000 being rolled out of Station 40, the final assembly hall in Toulouse, in November 2012.

The A350 XWB Final Assembly Line's fuselage join-up station in Toulouse has moveable jigs to accommodate the different fuselage lengths for its A350-800, -900 and -1000 versions.

Airbus' first A350 XWB moved to the next phase of ground testing with its transfer from the Final Assembly Line to Station 18, which is primarily dedicated to fuel, pressure, radio and navigation system evaluations.

The first A350 XWB with completed wings emerged from Airbus' Roger Beteille Final Assembly Line in Toulouse on February 26, 2013 for outdoor ground testing.

An A350-900 fuselage section being prepared for transport to the Final Assembly Line at Toulouse from the Saint-Nazaire factory.

MSN1, the first flight test A350, being moved at Toulouse to Station 18 for pressurisation, fuel tank and radio testing.

The A350's flight deck console consists often large multifunction displays.