Rolls-Royce says its Trent engines are now staying on wing roughly twice as long between scheduled shop visits as they were three years ago, a milestone that would put the manufacturer well past the target it set when it launched its durability programme.
In 2023, Rolls-Royce committed £1 billion — about $1.3 billion — to improving the durability of the Trent family, and set a target of a 40% improvement in time on wing across the fleet. Three years on, the company says it has achieved a 100% improvement, meaning engines are staying installed twice as long between planned removals.
Why time on wing is the number that counts
For an engine maker operating on long-term service agreements, time on wing is close to the whole commercial argument. Every shop visit means a removal, a spare engine to cover the gap, and a heavy maintenance bill that the manufacturer often carries under those agreements. Doubling the interval between visits reduces the number of spare engines an operator has to hold, cuts disruption for airlines and materially improves the economics on the manufacturer's side of the contract.
It matters particularly for the Trent 1000, which powers the Boeing 787 and whose durability problems grounded aircraft and strained airline schedules for years. Restoring confidence in that programme has been a central plank of the company's turnaround.
Delivered in stages
The improvement has arrived incrementally rather than all at once. According to FlightGlobal, the first phase entered service via retrofit in June 2025 and on new-build engines in November 2025, doubling time on wing. A second stage, adding a further 30%, was certificated in December 2025, has been incorporated into new engines since March 2026, and is now being rolled out across the in-service fleet.
FlightGlobal also reported that Rolls-Royce had raised its durability improvement target from 80% to more than 100% by the end of 2026, with more than half of that improvement already delivered at the time of reporting — a trajectory consistent with the figure the company is now claiming.
Much of the gain has been driven by refined and accelerated critical-part life-extension work on the Trent XWB-84, the variant that powers the Airbus A350-900. On the Trent 1000, the company secured certification in December for a "phase two" high-pressure turbine blade improvement covering the Trent 1000 XE and the Trent 7000.
Rolling it through the fleet
Certificating an upgrade and getting it onto every engine in service are different problems. More than one-third of in-service Trent 1000 engines have received an upgrade package, and Rolls-Royce aims to have modified the entire fleet by the end of 2027. Until that work is complete, individual operators will see different results depending on how far through the retrofit queue their engines sit.
The durability push also has a forward-looking dimension. The design and materials work behind the current improvements feeds into the architecture the company intends to carry into future engine programmes, where demonstrated on-wing life is increasingly what airlines evaluate first — ahead of headline fuel-burn figures that only materialise if the engine is actually on the aircraft.
Sources: Simple Flying, FlightGlobal. Featured image: AI-generated by AviationShop. By James Holloway.
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