The right hand second stage HPT fractured into four pieces with the engines at full power, as the aircraft was passing through 128 knots. The aircraft
was at 134 knots when power was retarded and brake pressure began to rise. It took 25 seconds to stop the aircraft.
One of the fractures showed signs of a fatigue failure and began at an inclusion on the forward side of the hub.
It was a defect that caused the #2 engine on United 232 to come apart, but that was the only one. It all depends on what caused it. There was a
turboprop aircraft that had the prop come off and embed in the wing, because of the cleaning process for the engine and prop. In that case, they found
several engines with issues.
They'll probably end up mandating inspections beyond a certain number of cycles, which will require borescope inspections.
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