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The Canadian Transportation Safety Board has issued a letter to Transport Canada concerning the in-flight breakup of a Quad City Challenger II Advance Ultralight aircraft that resulted in the fatal injury of the pilot in July. The TSB determined that the bracket securing the right front lift strut to the fuselage failed while in flight as the result of metal fatigue. The failure caused the right wing to separate from the aircraft. According to the report, the bracket had accumulated 402.2 hours when the failure occurred. The fatigue crack began at the bolt hole, and a "significant number" of secondary and parallel cracks were fou