Incident Overview
During the landing rollout on Runway 35, the aircraft began a gradual right turn, departing the runway pavement past the runway lights. It then impacted a dirt berm at a 90-degree angle approximately 80 feet from the runway centerline.
Pilot's Report
On the accident report form (6120.1/2), the pilot checked the box indicating 'No mechanical malfunction or failure.' However, the pilot did not provide a narrative statement on the form and did not sign or date it.
Wind Conditions
The airport UNICOM reported winds from 360 degrees at 10 knots. In contrast, the pilot stated on the form that the wind was north to west at 30 knots.