Accident investigators are puzzling over the causes of the first ever failure of a second-stage high-pressure (HP) turbine stage on a General Electric CF6-80C2 engine which suffered an uncontained release of debris during the Oct. 28 takeoff run of an American Airlines Boeing 767-300ER from Chicago O’Hare International Airport. National Transportation Safety Board (NTSB) investigators, aided by GE, are analyzing remains from the 1998-built No.2 (right) engine, which the manufacturer ...

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