NTSB investigators pinpoint failed aircraft part from UPS crash last year CNNBoeing Knew About Flaws in UPS Plane That Crashed in Louisville, N.T.S.B. Says The New York TimesBoeing knew of defect tied to fatal UPS plane crash in Louisville, NTSB finds WDRBIn UPS crash, NTSB probing MD-11 engine mount issue first identified by Boeing in 2011 The Air Current
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