UPS Plane That Crashed Had ‘Fatigue Cracks’ in Engine Mount, Preliminary Report Finds

Core Points - The United Parcel Service Inc. (UPS) freighter crash resulted from fatigue cracks in the left engine's turbine securing sections, leading to the death of 14 individuals [1][2] - The McDonnell Douglas MD-11F lost its left engine shortly after takeoff from Louisville, Kentucky, failing to climb higher than 30 feet before crashing [2] - The National Transportation Safety Board (NTSB) is investigating the crash, with initial findings indicating no obvious external damage, attributing issues to aging [4][6] Investigation Findings - The NTSB's preliminary report highlighted fatigue cracks and overstress failures in the engine mount structure [1][4] - The crash's circumstances are reminiscent of a 1979 American Airlines incident involving a McDonnell Douglas DC-10, although the structural failures occurred in different locations [3] - Investigators are examining maintenance records, noting that a detailed inspection of the left engine mount was conducted in October 2021, with the next intensive inspection not due for another 8,000 takeoffs and landings [6][7] Regulatory Actions - Following the crash, the FAA temporarily grounded all MD-11F cargo jets, affecting approximately 9% of UPS' fleet and 4% of FedEx Corp.'s fleet [5] - UPS proactively grounded its MD-11 fleet prior to the FAA's directive, citing caution [5] Aircraft Background - The specific aircraft involved was originally built for Thai Airways in the early 1990s and converted into a freighter about 20 years ago, powered by three General Electric CF6 engines [8] - The MD-11 is no longer in production and is exclusively used for cargo operations, with the last passenger flight occurring over a decade ago [8]