What happened
The pilot, who did not hold an instrument rating, obtained two separate weather briefings prior to the flight. During these consultations, he was explicitly informed that visual flight rules (VFR) operations were not recommended due to deteriorating conditions. Despite this advice, the aircraft departed at 1308 PST.
The flight failed to arrive at its intended destination, prompting authorities to initiate a search operation. Data from the National Transportation Safety Board's NTAP system revealed that the aircraft experienced several altitude changes during the journey, suggesting attempts to navigate through or around adverse weather.
Search teams located the wreckage on the west face of a mountain ridge at an elevation of 11,800 feet mean sea level (MSL). The accident site was inaccessible for detailed physical investigation due to high elevation, difficult terrain, and snow cover. A weather observation recorded at 1450 PST in Bishop, California, located 32 miles north of the crash site, indicated scattered clouds at 500 feet, overcast conditions at 800 feet, and visibility of three miles in light rain showers.
The investigation
Physical examination of the wreckage was not possible. Investigators were unable to access the accident site due to the combination of high elevation, rugged terrain, and snow accumulation. Consequently, no mechanical inspection or debris field analysis could be performed.
Findings
The pilot's decision to fly despite being advised against VFR operations played a significant role in the outcome. The weather conditions at the time of the flight were marginal for visual flight, with low cloud bases and reduced visibility. The aircraft's altitude fluctuations indicated an attempt to maintain visual reference or avoid obstacles in deteriorating weather.