The Rolls-Royce Trent XWB feature a 118 in (300 cm) fan disk diameter and the design will be based on the advanced developments of the Airbus A380 Trent 900 and the Boeing 787 Trent 1000. It has two thrust levels to power the A350 variants : a 84,000 lbf (370 kN) for the A350-900 and a 97,000 lbf (430 kN) for the A350-1000. The higher-thrust version will have some modifications to the fan module—it will be the same diameter but will run slightly faster and have a new fan blade design—and run at increased temperatures allowed by new materials technologies from Rolls-Royce's research.
The Trent XWB may also benefit from the next-generation reduced acoustic mode scattering engine duct system (RAMSES), an acoustic quieting engine nacelle intake and a carry-on design of the Airbus's "zero splice" intake liner developed for the A380.] A 'hot and high' rating option for Middle Eastern customers Qatar Airways, Emirates, and Etihad Airways keep its thrust available at higher temperatures and altitudes.
Airbus is aiming to certify the A350 with 350-minute ETOPS capability on entry into service. That could reach 420 min later. Engine thrust-reversers and nacelles will be supplied by US-based UTC Aerospace Systems.