Just two weeks after the fatal Nov. 4 UPS crash left 14 dead in Louisville, a preliminary National Transportation Safety Board report found the left engine detached from the plane and caught fire. Additionally, the investigation found evidence of "fatigue cracks," among other issues.

The crash involved a UPS Airlines MD-11 bound from Louisville to Hawaii that crashed right after takeoff just south of the Louisville Muhammad Ali International Airport on Grade Lane. The three crew members onboard and 11 people on the ground were killed, and according to the NTSB, an additional 23 people were injured from the crash.

As part of the investigation, the NTSB, an independent federal agency tasked with investigating transportation accidents and recommending safety guidelines , invited the

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