HISTORY OF FLIGHTOn May 18, 2019, about 1245 eastern daylight time, a Vans RV6A experimental, amateur-built airplane, N596JB, was destroyed when it was involved in an accident near Chillicothe, Ohio. The pilot was fatally injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. The airplane departed Pickaway County Memorial Airport (CYO), Circleville, Ohio, about 1235 and was destined for Pike County Airport (EOP), Waverly, Ohio. According to a witness near the accident site, the airplane "engine slowed or stalled," then the engine "refired" and subsequently "stalled" Again. He observed the airplane in a left bank turn and stated that the engine sounded "wide open" until the crash. PERSONNEL INFORMATIONThe pilot's last third-class FAA medical certificate was issued to him on February 6, 2017, with no limitations and expired on February 28, 2019. According to information from the FAA, the pilot completed the BasicMed comprehensive medical examination checklist on December 13, 2017, completed the BasicMed course on February 27, 2018, and satisfied the requirements for BasicMed. A review of the pilot's logbook showed that he completed a flight review on April 24, 2019. AIRCRAFT INFORMATIONAccording to the flight instructor who conducted the pilot's flight review, the pilot indicated that he previously had trouble with the accident airplane's engine ignition system but that it was working properly at that time. The flight instructor did not notice any problems with the engine ignition during the flight review. The airplane was equipped with a full authority digital engine control (FADEC) system, which controlled the ignition spark and fuel mixture in the engine. AIRPORT INFORMATIONAccording to the flight instructor who conducted the pilot's flight review, the pilot indicated that he previously had trouble with the accident airplane's engine ignition system but that it was working properly at that time. The flight instructor did not notice any problems with the engine ignition during the flight review. The airplane was equipped with a full authority digital engine control (FADEC) system, which controlled the ignition spark and fuel mixture in the engine. WRECKAGE AND IMPACT INFORMATIONThe airplane wreckage came to rest in a wooded area about 145° and 12 nautical miles from Ross County Airport (RZT). During the on-scene investigation, investigators found fragments of the airplane in both a tree trunk that had been separated about 30 ft above ground level and in the branches of the upper portion of the separated tree. The rear section of the fuselage and empennage came to rest about 57 ft and 70° from the separated tree, and the engine came to rest about 33 ft and 70° from the separated tree. The engine cowling, canopy, wings, and forward portion of the fuselage were highly fragmented and found in the branches of trees and on the ground between the separated tree and the empennage. Tree leaves near the empennage exhibited an appearance consistent with blight. The rudder cables were traced from the rudder to the rear section of the fuselage. Elevator flight control continuity was traced from its servo at the rear portion of the fuselage aft to its control surface. All separations in flight control tubing were consistent with overload. The engine control cable was fragmented and was not able to be traced. The engine speed sensor also exhibited minor damage. The engine was disassembled and no preimpact anomalies were observed. MEDICAL AND PATHOLOGICAL INFORMATIONThe Montgomery County Coroner's Office, Dayton, Ohio, performed an autopsy on the pilot. The autopsy listed the pilot's cause of death as multiple trauma . Toxicology testing performed at the FAA Forensic Sciences Laboratory indicated that the samples sustained putrefaction and ethanol was detected in muscle, liver, and lung tissue. No tested-for substances were detected in the liver. TESTS AND RESEARCHOne accident FADEC master power control (MPC) was destroyed and one sustained minor damage; it and the speed sensor were shipped to the engine manufacturer, and found the MPC was operationally capable of producing spark at each spark plug tower. The manufacturer connected the speed sensor to a testing system and it operated correctly when a metal target was moved near its sensors.