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Engine failed on United Airlines flight after pilots increased power, NTSB report says
The right engine of United Airlines Flight 328 failed with a fiery bang minutes after takeoff last month when the aircraft's pilots throttled up the engines to minimize expected turbulence, National Transportation Safety Board investigators said in an update Friday. The NTSB update also said a fan blade that failed in the Boeing 777's engine had most recently received a close inspection for wear and tear in 2016 and was less than halfway to the point of requiring another inspection.… (www.msn.com) 更多...
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I am surprised the fan blade inspection is dependent on cycles, not engine hours...
Cycles because blade cycles in reaction to force vector of thrust so there is a major bending load at full thrust that does not vary with each revolution. The bending stress is reduced to a lower level at climb thrust. In this case they throttled up creating a new stress cycle and BAM. 1175 was really odd because no change in stress - cruise. Their CNN expert says the fan blades are subject to so much heat. Odd, because heat is introduced in the combuster. The fan is always at air temperature because its air cooled - range from +50C to -65C.
So more inspections seem like a good idea. They should know the lot that blade was part of, and should be looking at every engine with a similar lot coded blade installed. Seems simple enough. They have those records somewhere.
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