HISTORY OF FLIGHTOn October 31, 2019, about 1730 eastern daylight time, an experimental, amateur-built Vans RV-4, N425JW, was destroyed when it was involved in an accident near Middleburg, Florida. The airline transport pilot was fatally injured. The airplane was operated as a Title 14 Code of Federal Regulations Part 91 personal flight. According to the pilot’s son, the pilot intended to conduct a brief flight before participating in family events later in the day. A witness at Haller Airpark (7FL4), Green Cove Springs, Florida stated that he was working in his hangar when he heard an airplane take off about 1720. He did not identify the airplane; however, about 10 minutes later the airport experienced a complete electrical power outage. WRECKAGE AND IMPACT INFORMATIONThe airplane was located in a construction clearing in a heavily wooded area. Power lines were observed on the ground near the wreckage. The wreckage path began where the power lines had been located and continued for about 450 ft on a 270° heading. A post-accident fire consumed the airplane. The main wreckage was inverted and oriented on a 320° heading. The wings were separated from the fuselage, and only about 4 feet of the wing tips remained. The wooden propeller was fragmented, and power line impression marks were found on the propeller blades. The vertical stabilizer was located about 230 ft from the main wreckage. Parts from the engine cowling, rudder, and canopy were found scattered in the wreckage path. The cockpit, instrument panel, and firewall were all destroyed by postimpact fire. The engine accessory case was consumed by fire; the magnetos, fuel pump, vacuum pump, and oil filter were destroyed. The engine crank case and cylinders were intact. The top spark plugs were removed, and a lighted borescope was used to examine the cylinder walls, exhaust, intake valves and piston heads. No anomalies were noted. The propeller was rotated by hand and thumb compression was established on all cylinders. Valve train continuity was established throughout the engine by observing movement of the rocker arms and rear accessory case gears. The carburetor was removed and disassembled with no anomalies noted. MEDICAL AND PATHOLOGICAL INFORMATIONAccording to the Office of the Medical Examiner, Jacksonville, Florida, the cause of the pilot’s death was multiple blunt injuries, and the manner of death was accident. With the exception on an enlarged heart (537 grams), there was no evidence of any significant natural disease identified. The Federal Aviation Administration (FAA) Forensic Sciences Laboratory toxicology testing detected the impairing medication gabapentin in the pilot’s liver tissue and urine (56 micrograms per milliliter [µg/mL]). Gabapentin (commonly marketed as Neurontin) is an antiseizure medication that is also used to treat chronic nerve pain and postherpetic neuralgia (shingles). It carries a warning that it “may cause dizziness, somnolence and other symptoms and signs of central nervous system depression” and patients should be advised not to operate complex machinery “until they have gained sufficient experience on gabapentin to assess whether gabapentin impairs their ability to perform such tasks.”