General Electric says microcracks discovered on a first stage high pressure (HPT) turbine blade in a ground test GEnx-1B do not present an obstacle to achieving early ETOPS certification and will not affect entry into service of the 787. The engine maker says the cracks were discovered in January during a scheduled borescope inspection of a GEnx-1B ground test engine undergoing cyclic endurance testing as part of ETOPS certification. “At that time, the engine had completed approximately ...

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