Primary finding
Probable cause
The airplane’s encounter with a dust devil after landing, which resulted in a loss of directional control.
Investigator assessment
Analysis narrative
The pilot reported encountering a dust devil (also called a whirlwind) during rollout following a full stall landing maneuver. The airplane did not have any aileron authority due to the low airspeed at the time of the encounter. The left wing subsequently impacted the ground and the airplane departed the runway. It continued to roll down a hill before flipping and coming to rest inverted, resulting in substantial damage to the empennage and both wings. The pilot reported there were no preimpact mechanical malfunctions or failures with the airframe or the engine that would have precluded normal operation.