At 17:54 Alaska daylight time, a Piper Pacer ran off the edge of runway 19 at the Dillingham airport. The two occupants were not injured. The pilot said that during his initial taxi, the airplane did not steer correctly, but he could not determine the reason and decided to return to parking. During the return taxi on runway 19, the pilot was unable to control the turn. After the accident, the pilot discovered that the external rudder gust lock was still installed.