Primary finding
Probable cause
Improper installation of the fuel filter element in the aircraft by company/maintenance personnel, and subsequent contamination of the fuel system by unfiltered fuel. Factors related to the accident were: inadequate design of the fuel filter assembly, which allowed the improper installation of the filter element, the mechanics lack of familiarity with the aircraft, and failure of ground personnel to insure that fuel from the fuel tanker was free of contamination.