Primary finding
Probable cause
The pilot's failure to maintain adequate clearance from a windmill while maneuvering during an aerial application flight.
Investigator assessment
Analysis narrative
The pilot reported that, while maneuvering over a field for the aerial application flight, the airplane’s wing struck a windmill that he did not see. The airplane subsequently collided with terrain and a postimpact fire ensued, which destroyed the airplane. The pilot reported that there were no preaccident mechanical malfunctions or failures with the airplane that would have precluded normal operation.