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- Killed one pilot."During the investigation, TSB employees examined 21 strut brackets from six other Quad City Challenger IIs using either optical or scanning electron microscopes. Cracks were found on eight of the 21 brackets. The investigators determined that some of the cracks were a result of fatigue, while others were a result of material delamination. The in-time service of these brackets ranged from four to 829 hours. Manufacturing dates of the brackets examined ranged from 1996 to 2018.