Aviation News – Investigators have identified fatigue cracks in a critical structure of a UPS MD-11 cargo jet that crashed in Louisville, Kentucky, killing 14 people, the National Transportation Safety Board (NTSB) reported.
The NTSB’s preliminary findings show that the November 4 accident involved the separation of the aircraft’s left engine and its pylon from the wing shortly after the plane began its takeoff roll. The discovery of fatigue damage suggests a structural failure that may have developed over time, prompting further scrutiny of maintenance procedures and inspection standards.
According to the early analysis, the left engine detached as the aircraft turned onto the runway, causing an immediate loss of control. Fatigue cracks—small fractures that grow under repeated stress—can compromise load-bearing components, making their detection and monitoring vital for safe operations.
“The evidence of fatigue cracking underscores the importance of rigorous structural inspections, especially on aging aircraft fleets,” an NTSB spokesperson said. “Our team is working to determine how this damage progressed and what steps may prevent similar failures.”
Investigators will continue analyzing maintenance records, component histories, and flight data to determine the root cause. Findings from this investigation could lead to updated inspection protocols and new safety recommendations for operators of older cargo aircraft.
In the coming months, the NTSB is expected to release additional updates as testing and analysis continue. The final report will outline contributing factors and potential measures to strengthen aviation safety across the industry.
Source NTSB
