U.S. National Transportation Safety Board (NTSB) investigators believe the breakdown of a General Electric GEnx-1B engine on a taxiing Boeing 787 July 28 stemmed from the failure of a fan mid-shaft. The fan shaft forms the low-pressure spool of the GEnx-1B engine and connects the fan stage with the low-pressure (LP) turbine. The shaft is made up of two main sections, and the failure is thought to have emanated in the torque-retaining nut connecting the two. The NTSB says the GEnx engine ...

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