Trent XWB

Overview

The Trent XWB (eXtra Wide Body) is Rolls-Royce's most efficient large commercial engine and the exclusive powerplant for the Airbus A350 XWB family. Certified as the world's most thermally efficient large aero engine at entry into service, the Trent XWB achieves its performance through a combination of an advanced three-shaft architecture (unique to Rolls-Royce among major Western engine manufacturers), a high overall pressure ratio of 50:1, and extensive use of advanced alloys and composite materials. Its bypass ratio of 9.3:1 — delivered through a 118-inch (3.0 m) composite fan — reduces specific fuel consumption to levels that make the A350 one of the most fuel-efficient widebody aircraft in airline service.

The Trent XWB's three-shaft design — with independent fan (LP), intermediate-pressure (IP), and high-pressure (HP) spools — allows each turbine stage to operate at its optimal speed, unlike the two-shaft designs used by GE Aerospace and Pratt & Whitney. This architecture enables shorter, lighter turbomachinery and contributes to the engine's efficiency advantage. The Trent XWB is the sole engine for the A350 — Airbus and Rolls-Royce agreed to an exclusive arrangement — which concentrates the entire A350 aftermarket revenue stream with Rolls-Royce through TotalCare power-by-the-hour service agreements, a strategically crucial long-term revenue source.

Technical Specifications

Variants

The Trent XWB family comprises two primary operational variants. The Trent XWB-84 (84,000 lbf / 374 kN) is the standard powerplant for the A350-900, the most popular A350 variant. The Trent XWB-97 (97,000 lbf / 431 kN) was developed for the larger and heavier A350-1000, requiring a complete redesign of the LP turbine and a new intermediate-pressure turbine to achieve 15% more thrust than the -84 while maintaining the same fan diameter. The -97 also introduced a counter-rotating IP turbine to recover swirl energy, an innovation from Rolls-Royce's advanced development programs. A potential Trent XWB-76 variant for a possible A350-800 was studied but shelved when Airbus cancelled the A350-800 program in 2014.

Aircraft Applications

• Airbus A350-900: Trent XWB-84 (84,000 lbf) — exclusive engine; most popular A350 variant, 300–350 passengers in typical layout
• Airbus A350-1000: Trent XWB-97 (97,000 lbf) — exclusive engine; largest A350, competing with 777-300ER

Development History

Rolls-Royce launched the Trent XWB development in 2006 when Airbus selected Rolls-Royce as the exclusive engine supplier for the A350. The first Trent XWB engine test ran in June 2010 at Rolls-Royce's Dahlewitz facility in Germany. The engine flew for the first time on an A380 flying testbed in February 2012 for high-altitude performance validation. EASA certification of the Trent XWB-84 was achieved in February 2013. Qatar Airways launched A350-900 revenue service in January 2015 with the Trent XWB-84. Development of the higher-thrust -97 variant for the A350-1000 was certified in November 2016, with Qatar Airways again serving as launch customer in February 2018. Early in-service experience revealed some intermediate-pressure turbine blade durability issues that were addressed through redesigned blades delivered from 2020 onward. The Trent XWB has proven one of the industry's most reliable widebody engines, with Qatar Airways and Singapore Airlines reporting exceptional dispatch rates. As of 2025, approximately 2,100 Trent XWB engines had been delivered, with Rolls-Royce's TotalCare contracts ensuring decades of recurring aftermarket revenue tied to A350 flying hours.