UPS MD-11 Crash NTSB Report Targets Boeing Safety Analysis Gaps

The NTSB on June 20, 2026, released new investigative findings in its probe of the fatal UPS MD-11 crash, introducing fresh evidence of engine-pylon failure rooted in fatigue cracking. Investigators identified the aircraft's aft mount bulkhead spherical bearing assembly as a focal point, noting that the failure mode is consistent with a design issue previously addressed in a Boeing service letter regarding bearing race failures.

Fracture surfaces showed fatigue cracking originating around much of the bearing race, with the remaining portion exhibiting overstress failure. The findings have intensified scrutiny of Boeing's prior safety analysis — specifically whether the manufacturer understated failure risk and whether McDonnell Douglas MD-11 freighter maintenance procedures adequately addressed this failure mode.

Investigation Context

The updated findings stem from a fatal landing accident in September 2024 involving a UPS MD-11F at Louisville, Kentucky, in which three crew members were killed. Surveillance video captured the left engine and pylon separating from the aircraft, a sequence the NTSB continues to examine. The investigation, which involves the FAA, UPS, Boeing, GE Aerospace, and the Independent Pilots Association, has broadened into a wider discussion of cargo-fleet safety and the structural integrity of aging widebody freighters — particularly concerns about the MD-11's handling characteristics as operators reassess operational risk.