LONDON—Aero-engine manufacturer Rolls-Royce says its timetable to fix problems found in the TEN version of the Trent 1000 engine will be delayed after evaluations revealed that proposed modifications would not deliver a “sufficient level” of enhanced durability. The development of a new high-pressure turbine (HPT) blade for the TEN-derivative of the Boeing 787 engine is now unlikely to be ready before the first half of 2021, the company said in a Nov. 7 financial ...

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