Aviat A1 N96WJ accident near Evanston, Wyoming

Probable cause

The airplane’s encounter with downdrafts in mountainous terrain, which resulted in a collision with terrain. Contributing to the accident was the pilot’s decision to continue the flight through mountainous terrain in marginal weather conditions.

NTSB analysis

The pilot reported that he was flying cross-country to his home airport. While en route, the pilot determined that weather conditions prevented continued flight to his planned destination, and chose to divert to another airport. According to the pilot, while en route to his diversion airport over mountainous terrain, he encountered low ceilings of about 500 to 1,000 ft above ground level and strong downdrafts. The pilot was unable to maintain altitude and impacted rising terrain, resulting in substantial damage to the fuselage, empennage and both wings.

The pilot reported no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation. He stated that the accident would likely have been prevented if he had stopped at an airport he had passed prior to reaching the mountainous terrain.

Text from the NTSB. Open the NTSB docket for WPR26LA048 for the full record.