Still images from airport surveillance video show the left engine of UPS flight 2976 separating from the wing during takeoff, preventing the jet from climbing higher than 30 feet and dooming it to a fiery crash which killed the three crewmembers and 11 people on the ground in Louisville, Kentucky earlier this month.

A preliminary report [PDF] describes the disaster moment by moment and the forensic evidence, including fatigue cracks and overstress on lugs of the pylon connecting the engine and the wing. 10

After initial cleaning of the fracture surfaces, examination of the left pylon aft mount lug fractures found evidence of fatigue cracks in addition to areas of overstress failure. On the aft lug, on both the inboard and outboard fracture surfaces, a fatigue crack was observed where th

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