Approach and Landing
The pilot reported that both engines were surging during the approach to land on runway 10. The aircraft was oscillating about its vertical axis approximately 15–20 degrees. To maintain runway alignment, the pilot applied full right rudder. He then lowered full wing flaps and reduced engine power to slow the aircraft.
Loss of Control
Passing over the end of the runway, the pilot reduced engine power further. The aircraft then went to the left and crashed in the grass next to the runway.
Post-Crash Examination
Post-crash examination of the aircraft showed that both propellers had damage consistent with powered rotation at the time of ground impact. Examination of the engines revealed no evidence of failure or malfunction that would cause the surging reported by the pilot.
Communications and Weather
No transmissions were received by the ATC tower from the pilot reporting malfunctions with the aircraft. The winds were from 080 degrees at 18 knots, gusting to 22 knots at the time of the accident.