What happened
During a short cross-country flight, the pilot was operating a high-performance single-engine airplane for only the third time solo. After climbing to 20,000 feet MSL, the aircraft began a descent. While descending through 13,000 feet MSL, the aircraft entered a descending left turn. Air traffic control attempted to contact the pilot to check on the aircraft's status, but the pilot did not respond to any subsequent communications.
Following this turn, the aircraft entered a high-speed, nose-down descent toward the ground. An eyewitness reported seeing the aircraft in a steep dive, noting that the engine appeared to be at full throttle and there were no visible signs of fire, smoke, or structural failure. The aircraft eventually struck trees, powerlines, and the ground in a shallow descent with a slight left-wing low attitude. The resulting debris field was consistent with a high-speed impact.
Findings
An investigation of the engine and airframe found no mechanical failures that would have prevented the aircraft from operating normally. A performance analysis determined that the aircraft exceeded the airspeed, bank angle, and load factor limits specified in the Pilot’s Operating Handbook during the roll and dive.
While the pilot had been communicating normally with ATC less than two minutes before the roll began, it could not be determined if the pilot was distracted or incapacitated. Although trace amounts of ethanol were found in toxicological samples, the levels were below the legal limit of 0.04 gm/dl and were not considered a contributing factor. Ultimately, the uncontrolled roll and dive occurred, but the specific cause regarding the pilot's actions or medical state remains undetermined due to insufficient evidence.