NTSB ties fatigue cracking in MD‑11 engine pylon to fatal UPS crash; recalls 2011 Boeing pylon bearing bulletin
An NTSB investigative update links fatigue cracking in the left engine pylon of UPS Flight 2976 (an MD‑11F) to the fatal November 2025 Louisville crash. Boeing issued a 2011 service bulletin warning of possible spherical bearing failures in the same pylon component but then judged it not a safety threat.