US National Transportation Safety Board issued "urgent" recommendations upon conclusion of its investigation into the uncontained CF6-80A failure in June on an American Airlines 767 parked at Los Angeles International Airport (ATWOnline, June 15). NTSB, in finding that the high-pressure turbine stage 1 disk rupture resulted from a rim-to-bore radial fracture originating at a "small dent" at the bottom of the blade slot and that the disk, which had accumulated 9,186 cycles in service, had two ...

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