Airlines flying Boeing 787 Dreamliner jets powered by a particular model of Rolls-Royce engines face substantial disruption after the Federal Aviation Administration (FAA) placed restrictions on how far from an airport the airplanes can fly.
The FAA directive, effective Tuesday, restricts those planes from operating more than 140 minutes from an airport they can divert to in an emergency, down from 330 minutes.
Rolls says the measure affects 383 engines currently in service. Boeing says that about 168 Dreamliners, a quarter of the worldwide fleet, have at least one of the affected engine models.
The FAA order, posted online Monday, comes after the European Aviation Safety Agency (EASA) last week ordered additional maintenance checks on Rolls-Royce Trent 1000 “package C” engines after it was found that durability issues with blades in the engine core were worse than first thought.
The FAA imposed the restrictions because blades in the intermediate pressure compressor of the Trent 1000s have been found to vibrate when the engine is operating at high levels of thrust under certain temperature and altitude conditions.
The blade vibration can cause metal-fatigue damage and engine failure.
The FAA said that over the past year there have been several engine failures due to the issue and “numerous reports of engine-inspection findings of cracked blades.”
The safety concern is that should one of the two engines on a 787 fail in flight for any
Article source: https://www.seattletimes.com/business/boeing-aerospace/faa-imposes-restrictions-on-boeing-787s-powered-by-some-rolls-engines/