What happened
While operating in Southern California, an aircraft encountered significant weather challenges including haze and smoke from active wildfires. The environment was characterized by several distinct cloud layers located at 9,000, 12,000, and 16,000 feet, which significantly limited visibility aloft. After departing toward a western VORTAC, the aircraft's altitude climbed from 3,500 feet msl to 12,900 feet msl, eventually surpassing its filed VFR flight plan altitude of 8,500 feet msl.
Radar tracking indicated that during the final six minutes of flight, the aircraft fluctuated between 11,000 and 12,700 feet msl. In the final three minutes, the aircraft performed several climbing and descending turns to both the left and right before reversing its course. A rapid descent was recorded between the final two radar returns; the altitude dropped from 11,900 feet msl to 7,700 feet msl in just nineteen seconds, representing a vertical speed of 13,263 feet per minute.
The wreckage was spread across a 0.2-nm area, with the primary debris located roughly 0.5 miles northwest of the final radar contact. The debris field included components such as the left elevator, portions of the right stabilizer and elevator, and sections of the horizontal empennage. Additionally, fragments of the rudder, vertical stabilizer, and both ailerons were recovered. The fuselage, engines, propellers, and wings were located at the southern end of the path. The aircraft struck the ground in an inverted position, with the wings separating from the nacelles upon impact.
Findings
An investigation into the wreckage determined that all structural failures were caused by structural overload. This occurred following a high-speed descent initiated after the aircraft encountered clouds and reduced visibility.