NTSB ties fatigue cracking and prior warnings to engine‑pylon failure in UPS MD‑11 Louisville crash
The NTSB's investigative update identifies fatigue cracking in the left engine‑pylon mount of the UPS MD‑11 that separated during the November 2025 Louisville takeoff, pinpointing the failed component. Boeing warned operators of the part's flaw in 2011, and investigators say it had multiple prior failures on other aircraft.