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FAA issues emergency AD on GE-equipped Boeing 777-200s
1 October 2006

A FADEC software fault in certain Boeing 777-200 airplanes equipped with General Electric GE90-110B and -115B engines caused the FAA to issue an emergency AD. Two occurrences were reported of engine thrust rollback (reduction) during
takeoff. In both cases, only one engine was affected. The N1 thrust level on the affected engine progressively dropped resulting in a thrust loss of 65 to 77% due to an erroneous N1 command computed by the FADEC. The AD requires revising the Airplane Flight Manual (AFM) to prohibit takeoffs at less than full-rated thrust. This is an interim action since the engine manufacturer has advised that it currently is developing a modification that will eliminate the unsafe condition. (FAA)