Overview
The left wing of an airplane separated in flight while the non-instrument rated pilot attempted to maneuver the aircraft under a line of severe convective activity along the planned route. The pilot had received a weather briefing approximately two hours before departure, which advised of developing heavy thunderstorm activity and recommended against VFR flight.
Weather Conditions
Residents in the area reported severe thunderstorms and heavy rain showers, with wind gusts reaching 50 miles per hour and visibilities as low as a quarter of a mile. The weather briefing had specifically warned of the severe conditions, but the pilot proceeded with the flight.
Investigation Findings
Investigators located the wreckage three days after the accident, scattered over a distance exceeding half a mile. The left wing was found at the farthest point from the main wreckage, and its separation was consistent with an upward and aft direction. Continuity was established to all flight controls, indicating that the control systems were intact prior to the separation.
Wreckage Examination
Examination of the airframe and engine at the accident site did not disclose any mechanical problems. No pre-existing failures or malfunctions were identified that could have contributed to the wing separation. The investigation concluded that the structural failure occurred as a direct result of the pilot's decision to maneuver the airplane in severe convective weather conditions, for which he was not instrument rated and against which he had been explicitly warned.