What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
Pilot stated he had departed sgs approximately 40 minutes prior to experiencing engine roughness and apparent loss of power. The engine had been recently overhauled and this flight was for monitoring and recording engine parameters. Pilot stated that the last noted entry was approximately 30 minutes into the flight and all parameters appeared normal. He stated that the engine started to run rough and backfire a lot. A witness that heard the aircraft stated that the engine sounded very rough and was backfiring repeatedly shortly before the accident. He was unable to maintain altitude with the available engine power. Pilot stated that he picked out what appeared to be a suitable field to land in. The pilot landed the aircraft and after approximately 825 feet, the aircraft hit a rough area and nosed over onto it's back.
As the FAA filed it
PILOT STATED HE HAD DEPARTED SGS APPROXIMATELY 40 MINUTES PRIOR TO EXPERIENCING ENGINE ROUGHNESS AND APPARENT LOSS OF POWER. THE ENGINE HAD BEEN RECENTLY OVERHAULED AND THIS FLIGHT WAS FOR MONITORING AND RECORDING ENGINE PARAMETERS. PILOT STATED THAT THE LAST NOTED ENTRY WAS APPROXIMATELY 30 MINUTES INTO THE FLIGHT AND ALL PARAMETERS APPEARED NORMAL. HE STATED THAT THE ENGINE STARTED TO RUN ROUGH AND BACKFIRE A LOT. A WITNESS THAT HEARD THE AIRCRAFT STATED THAT THE ENGINE SOUNDED VERY ROUGH AND WAS BACKFIRING REPEATEDLY SHORTLY BEFORE THE ACCIDENT. HE WAS UNABLE TO MAINTAIN ALTITUDE WITH THE AVAILABLE ENGINE POWER. PILOT STATED THAT HE PICKED OUT WHAT APPEARED TO BE A SUITABLE FIELD TO LAND IN. THE PILOT LANDED THE AIRCRAFT AND AFTER APPROXIMATELY 825 FEET, THE AIRCRAFT HIT A ROUGH AREA AND NOSED OVER ONTO IT'S BACK.
NTSB investigation
The NTSB’s investigation of this event, with its probable cause and findings. Matched to this report by N-number and date.