What happened
During a night flight, the pilot was performing a left-hand downwind leg for landing, traveling from east to west. The flight was positioned at an altitude of 8,400 feet MSL, which placed the aircraft 1,000 feet above the airport's elevation of 7,411 feet. While the pilot could identify the airport in the darkness, the surrounding terrain was not visible. During this phase of flight, the pilot suddenly encountered the ground, leading to a collision with a mountain ridge. The wreckage was located on a snow-covered area of the ridge at an elevation of 8,489 feet.
Findings
An investigation into the aircraft systems showed no mechanical failures or anomalies prior to the impact. The pilot reported that the aircraft was functioning normally before the accident occurred. However, the terrain near the airport includes significant obstacles, with published terminal procedures noting high terrain reaching 8,739 feet south-southeast of the airfield. The accident occurred when the aircraft impacted terrain while flying at an altitude below the surrounding mountain peaks.