What happened
The FAA’s narrative, in sentence case. The FAA writes it in capitals and removes private details.
(-23) Aircraft received fuel at thv at 1735 hrs. During pre-takeoff engine check, at 1810 hrs, in rwy 35 run-up area, aircraft experienced flash fire. Pilot stated he noted strong fuel odors during check and he observed flames originating under right wing. Pilot immediately shut down engine and egressed from aircraft without difficulty. While moving away from aircraft pilot noted fire under the aircraft and then heard a small concussive event from inside aircraft. Pilot reported aircraft was involved in flames for less than 30 seconds and fire self extinguished. Aircraft inspection revealed minor heat damage to right wing flap and sheet metal deformation to fuselage upper skin forward of vertical stabilizer. The right wing fuel tank port cap was not installed. The fuel cap was located alongside the taxiway to rwy 35, adjacent to incident site.
As the FAA filed it
(-23) AIRCRAFT RECEIVED FUEL AT THV AT 1735 HRS. DURING PRE-TAKEOFF ENGINE CHECK, AT 1810 HRS, IN RWY 35 RUN-UP AREA, AIRCRAFT EXPERIENCED FLASH FIRE. PILOT STATED HE NOTED STRONG FUEL ODORS DURING CHECK AND HE OBSERVED FLAMES ORIGINATING UNDER RIGHT WING. PILOT IMMEDIATELY SHUT DOWN ENGINE AND EGRESSED FROM AIRCRAFT WITHOUT DIFFICULTY. WHILE MOVING AWAY FROM AIRCRAFT PILOT NOTED FIRE UNDER THE AIRCRAFT AND THEN HEARD A SMALL CONCUSSIVE EVENT FROM INSIDE AIRCRAFT. PILOT REPORTED AIRCRAFT WAS INVOLVED IN FLAMES FOR LESS THAN 30 SECONDS AND FIRE SELF EXTINGUISHED. AIRCRAFT INSPECTION REVEALED MINOR HEAT DAMAGE TO RIGHT WING FLAP AND SHEET METAL DEFORMATION TO FUSELAGE UPPER SKIN FORWARD OF VERTICAL STABILIZER. THE RIGHT WING FUEL TANK PORT CAP WAS NOT INSTALLED. THE FUEL CAP WAS LOCATED ALONGSIDE THE TAXIWAY TO RWY 35, ADJACENT TO INCIDENT SITE.