What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Airman was practicing taxiing of the aircraft up and down the runway. The winds were blowing out of the north at an estimated 10 to 12 knots based upon witness statements who observed the windsock at the time of the incident. The aircraft turned around in the south field run-up area and began a return taxi to the north. Witness statements noted that the flaps were extended. The trim was set to a nose down position, as noted during the investigation, at near full travel. As the aircraft was accelerated northbound on the runway, the aircraft began to veer to the left. Tire tracks show the aircraft was realigned to the runway centerline and then became momentarily airborne. The pilot stated that the aircraft set down hard and the seat broke loose from the attachment causing him to be unable to reach the pedals since the seatbelts locked. He lost directional control and veered left off of the runway and over an embankment that resulted in the aircraft falling approximately 15' verticaly. The aircraft flipped over, and came to rest inverted. The pilot was not current as a pilot-in-command, nor had a current medical, or flight review, which he was hoping to accomplish with the training in this aircraft.
As the FAA filed it
(-23) AIRMAN WAS PRACTICING TAXIING OF THE AIRCRAFT UP AND DOWN THE RUNWAY. THE WINDS WERE BLOWING OUT OF THE NORTH AT AN ESTIMATED 10 TO 12 KNOTS BASED UPON WITNESS STATEMENTS WHO OBSERVED THE WINDSOCK AT THE TIME OF THE INCIDENT. THE AIRCRAFT TURNED AROUND IN THE SOUTH FIELD RUN-UP AREA AND BEGAN A RETURN TAXI TO THE NORTH. WITNESS STATEMENTS NOTED THAT THE FLAPS WERE EXTENDED. THE TRIM WAS SET TO A NOSE DOWN POSITION, AS NOTED DURING THE INVESTIGATION, AT NEAR FULL TRAVEL. AS THE AIRCRAFT WAS ACCELERATED NORTHBOUND ON THE RUNWAY, THE AIRCRAFT BEGAN TO VEER TO THE LEFT. TIRE TRACKS SHOW THE AIRCRAFT WAS REALIGNED TO THE RUNWAY CENTERLINE AND THEN BECAME MOMENTARILY AIRBORNE. THE PILOT STATED THAT THE AIRCRAFT SET DOWN HARD AND THE SEAT BROKE LOOSE FROM THE ATTACHMENT CAUSING HIM TO BE UNABLE TO REACH THE PEDALS SINCE THE SEATBELTS LOCKED. HE LOST DIRECTIONAL CONTROL AND VEERED LEFT OFF OF THE RUNWAY AND OVER AN EMBANKMENT THAT RESULTED IN THE AIRCRAFT FALLING APPROXIMATELY 15' VERTICALY. THE AIRCRAFT FLIPPED OVER, AND CAME TO REST INVERTED. THE PILOT WAS NOT CURRENT AS A PILOT-IN-COMMAND, NOR HAD A CURRENT MEDICAL, OR FLIGHT REVIEW, WHICH HE WAS HOPING TO ACCOMPLISH WITH THE TRAINING IN THIS AIRCRAFT.