What happened
Prior to departing on a long-distance flight, the pilot received a complete weather briefing. While the destination airport was initially expected to have visual meteorological conditions, subsequent advisories, including an AIRMET and a Center Weather Advisory (CWA), indicated deteriorating IFR conditions. During a scheduled refueling stop, a new CWA was issued for the destination, but there is no evidence the pilot received this update. Approximately ten minutes before the arrival, the pilot communicated to air traffic control that he had checked the current weather for his destination.
During the final approach, the aircraft's flight path was unstabilized. The pilot descended below the minimum descent altitude of 440 feet. After briefly emerging from the fog at approximately 100 feet agl, the aircraft re-entered the fog and performed a 360-degree right turn near the runway approach end, with altitude fluctuations between 100 and 300 feet. The aircraft then climbed to roughly 800 feet before radar contact was lost. The aircraft eventually came to rest in an inverted position. Witness accounts suggested the plane descended through the clouds in a spin prior to hitting the ground. An inspection of the aircraft and engine showed no mechanical failures or anomalies that would have prevented normal flight.
Findings
Investigation into the event suggests that the pilot was likely unaware of the worsening weather, as air traffic controllers did not relay recent pilot reports (PIREPs) or the updated CWA to the pilot. Nearby airports were reporting low visibility and low ceilings, and three PIREPs regarding poor conditions had been filed shortly before the accident. The circumstances, characterized by restricted visibility and the specific maneuvers performed during the approach, are consistent with spatial disorientation. This disorientation likely led to an aerodynamic stall and subsequent spin.