NTSB: Fatigue cracking in MD‑11 left engine pylon linked to Louisville crash; Boeing flagged part in 2011
An NTSB update links fatigue cracking in the left engine pylon of the UPS MD‑11F to the engine’s separation during its Louisville takeoff, finding similar fractures had occurred at least four prior times. Boeing warned owners of the flawed pylon in a 2011 service letter but did not call it a safety threat.