Engines / Powerplant

The Trent XWB family comprises two basic engines to power the three A350 variants. The baseline 370 kN (83,000 lbf) thrust version for the A350-900 will be derated to 330 kN (74,000 lbf) and 350 kN (79,000 lbf) for the -800, while an upgraded 432 kN (97,000 lbf) thrust version will power the A350-1000. The higher rating 432 kN (97,000 lbf) engine will have some modifications to the fan module - it will be the same 118-inch diameter but will run slightly faster and have a new fan blade design - and some increases in temperatures brought by new materials technologies coming from its research programmes. The basic 248t MTOW -800 will be offered with a 330 kN (74,000 lbf) sea-level-thrust rating, while the 279t MTOW option will have 350 kN (79,000 lbf) thrust. Airbus also plan to offer a 'hot and high' rating option flat-rated at 350 kN (79,000 lbf) at higher altitudes and temperatures which uses the full capability of the -900's 370 kN (83,000 lbf) thrust engine prompted by the operating requirements for Middle Eastern launching customers Qatar Airways, Emirates, and Etihad.

The Trent XWB will feature a 118-inch (300 cm) fan diameter and the design will be based on the advanced developments of the Trent 900 (Airbus A380) and Trent 1000 (Boeing 787). The Trent XWB may also benefit from the next-generation reduced acoustic mode scattering engine duct system (RAMSES), which is a noise-dampening engine nacelle intake and a carry-on design of the Airbus's "zero splice" intake liner developed for the A380. Engine thrust-reversers and nacelles will be supplied by US-based Goodrich Corporation.

The A350 XWB will feature a 1,268 kW (1,700 hp) Honeywell HGT1700 auxiliary power unit, which has 10% greater power density than the previous generation of Honeywell's 331 APU family. Honeywell will also supply the air management system: the bleed air, environmental control, cabin pressure control and supplemental cooling systems. The ram-air turbine will be supplied by Hamilton Sundstrand and will be located in the lower surface of the fuselage. The generator requirement for the ram air turbine is 100 kVA compared to 150 kVA for the A380.