N94818 - Aircraft Aircraft Registration

The in-flight loss of airplane control due to rear wing spar attachment fitting failure. The failure resulted from severe corrosion that was undetected during performance of an inspection specified by an airworthiness directive. The airworthiness directive developed by the FAA was deficient in its specificity relating to recurrence. The directive was also deficient in its procedure requiring external inspection, which would not reveal development of internal corrosion. Contributing factors to the accident were the turbulent atmospheric condition that exacerbated the wing loading and the pilot's operation of the airplane in excess of maximum authorized gross weight.