What happened
While approaching the end of a remote tundra strip, the pilot reported that the engine suddenly lost a substantial amount of power at approximately two hundred feet altitude. The aircraft landed short of the intended area and bounced; during this period, the engine regained some RPM.
The pilot attempted a go-around, but the engine experienced another loss of power. Consequently, the pilot performed a forced landing near the end of the airstrip. During the landing, heavy wheel braking was applied, which caused the aircraft to nose over onto its back. The pilot was not injured.
The investigation
Prior to the flight, which was an approximately eight-hour ferry flight to Anchorage, Alaska, the pilot had drained the fuel tanks and engine sumps, finding no evidence of contamination. A teardown examination of the engine revealed no abnormalities.