|A Trent XWB on a Qatar Airways Airbus A350-900|
|National origin||United Kingdom|
|First run||14 June 2010|
|Major applications||Airbus A350 XWB|
|Program cost||US$12 billion[dubious ]|
|Unit cost||~ $35 million (List Price)|
|Developed from||Rolls-Royce Trent 1000|
The Rolls-Royce Trent XWB is a British series of turbofan jet engines developed from the Rolls-Royce Trent 1000, exclusively powering the Airbus A350 XWB. It passed one-million flight hours in October 2017 without any in-flight disruptions and with a dispatch reliability of 99.4%. By February 2018, it has completed 1.3 million flight hours with a 99.9% dispatch reliability.
By 2004 Airbus had been facing pressure from customers to develop a competitor to the Boeing 787 Dreamliner, then in October 2005 formally launched a new aircraft designated the Airbus A350. Rolls-Royce initially offered a conventional bleed air engine variant of the Trent 1000 with a throttle-push to 75,000 lbf (330 kN) static thrust, the Trent 1700. It would have been developed in partnership with Kawasaki Heavy Industries.[verification needed]
In 2006, after a review of the Airbus A350, Rolls-Royce reached an agreement to supply all versions of the aircraft with a brand-new Trent XWB variant with 75,000 to 95,000 lbf (330 to 420 kN) of thrust. By September 2007 Airbus had revised their requirements down to 75,000–93,000 lbf (330–410 kN)[a].[verification needed]
In the December 2008 design freeze, as the A350 weight empty is 2.2t greater than the 113.5t target, its MTOW was increased by 3t to maintain the payload/range capability, then in 2009 the Trent XWB thrust was increased by 1,000lb (4.5kN) to 84,000 lbf (374 kN) for the -900 and 93,000 lbf (414 kN) for the -1000 with a "very marginal" impact on fuel burn, the second thrust adjustment since thrust was raised by 1,000 to 4,000 lbf (4.4 to 17.8 kN) in 2007.
This was then revised again in 2011, and the engines for the largest A350 have been uprated to 97,000 lbf (430 kN) to meet new performance requirements, and better compete with the Boeing 777-300ER.
The first engine test on a static test-bed was made on 14 June 2010. On 18 February 2012, Airbus announced that the Trent XWB had successfully made its maiden flight aboard Airbus’ dedicated Airbus A380 flying test bed. Certification for the early engine variants was achieved in 2013. The first engine was expected to enter service in 2014. The first flight of the Trent XWB powering the Airbus A350 XWB took place on 14 June 2013.
On 15 May 2014 Rolls-Royce delivered the first production 84,000 lbf (370 kN) thrust Trent XWB engines intended for the first Airbus A350 XWB to enter service with Qatar Airways. Final assembly of these production engines had started in February 2014. On 15 July 2014 Rolls-Royce announced the first run of the Trent XWB-97 powerplant with 97,000 lbf (430 kN) thrust for the Airbus A350-1000.
On 26 July 2017, Airbus delivered the 100th A350, on track for 10 per month by 2018 end, and over the first 30 months most engine removals have been to stagger the on-wing life of a particular aircraft or to collect in-service data; 90% of the trent XWBs have a long-term service agreements with Rolls, which has designated seven shops as MRO providers: its Derby facility, its joint ventures with HAECO, SIAEC, N3 Engine Overhaul Services and independents Delta TechOps, Mubadala and Air France Industries-KLM.
It took two years to reach one million flying hours and nine months for the second million by July 2018, as 500 were delivered, it has a 99.9% despatch reliability and had no in-flight shutdown yet.
The Trent XWB features a 2-stage IP turbine rather than a single stage like previous Trents.
The 97,000 lbf (430 kN) version for the A350-1000 maintain the same 3.0 m fan size and a 5% larger core, the additional thrust will require the fan to run 6% faster which will require strengthening to withstand the increased fan-blade forces produced It has thicker titanium fan blades and a stronger fan casing and takes advantage of technologies developed through the European Environmentally Friendly Engine (EFE) research program. Its core operating temperature capability will be increased.
On 18 June 2007 Rolls-Royce announced that it had signed its biggest ever contract, with Qatar Airways, worth US$5.6 billion at list prices. This was for 80 Airbus A350 XWBs, powered by Trent XWB engines.
On 11 November 2007 another large contract was announced at the Dubai Airshow, with Emirates, for Trent XWBs to power 50 A350-900 and 20 A350-1000 aircraft, with a further 50 option rights. Due to be delivered from 2014, the Emirates order was potentially worth up to $8.4 billion at list prices, including options. However, on 11 June 2014, Airbus announced that Emirates Airline had decided to cancel its order of 70 A350 XWB aircraft.
|Designation||Certified||Net Take-off Rating||Net Maximum Continuous|
|Trent XWB-75||7 February 2013||74,200 lbf (330 kN)||66,600 lbf (296 kN)|
|Trent XWB-79||7 February 2013||78,900 lbf (351 kN)||71,400 lbf (318 kN)|
|Trent XWB-79B||7 February 2013||78,900 lbf (351 kN)||71,400 lbf (318 kN)|
|Trent XWB-84||7 February 2013||84,200 lbf (375 kN)||71,400 lbf (318 kN)|
|Trent XWB-97||31 August 2017||97,000 lbf (430 kN)||83,100 lbf (370 kN)|
|Type||Three-shaft, high bypass ratio, axial flow, turbofan|
|Fan||1-stage, 3.00m / 118" diameter, 22 blades[b]|
|Compressor||8-stage IP, 6-stage HP|
|Combustor||annular, 20-off fuel spray nozzles|
|Turbine||single stage HP, 2-stage IP, 6-stage LP[c]|
|Length||5,812 mm / 228.8 in[d]|
|Dry weight||7,277 kg (16,043 lb)||7,550 kg (16,640 lb)|
|Takeoff thrust||84,200 lbf (375 kN)||97,000 lbf (431 kN)|
|rotor speed (RPM)||LP: 2700, IP: 8200, HP : 12600|
|Air mass flow||1,436kg/s / 3,166lb/s|
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