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NTSB issues urgent safety recommendation on B777 engine thrust rollback events
12 March 2009

Following two engine thrust rollback events on Boeing 777 aircraft powered by Rolls-Royce engines, the National Transportation Safety Board (NTSB) issued an urgent safety recommendation today calling for the redesign of a Rolls- Royce engine component. The Safety Board also recommended that, after the redesign is completed, the new system be installed on all affected B-777 airplanes at the next maintenance check or within six months.

These recommendations are being issued in response to the findings in two investigations – an accident and an incident – involving engine thrust rollbacks on Boeing 777-200ER airplanes powered by Rolls-Royce RB211 Trent 800 Series engines. In both cases a build-up of ice (from water normally present in all jet fuel) on the fuel/oil heat exchanger (FOHE) restricted the flow of fuel to the engine, resulting in an uncommanded engine rollback.