N4714HSorensen Danny PITTS S1-S · 1984

On July 14, 2016, about 1930 central daylight time, an experimental amateur-built Pitts S1-S, N4714H, was substantially damaged while landing at Fayette County Airport (FYE), Somerville, Tennessee. The private pilot was not injured. The airplane was registered to and operated by the private pilot as a personal flight conducted under the provisions of 14 Code of Federal Regulations Part 91. Visual meteorological conditions prevailed and no flight plan was filed for the flight that originated from Wolf River Airport (54M), Rossville, Tennessee, about 1845.The pilot reported that after a normal three-point landing in a calm wind, the airplane began swerving as it slowed. The airplane then departed the right side of the runway and ground-looped, which resulted in substantial damage to the lower left wing.

Examination of the wreckage by a Federal Aviation Administration (FAA) inspector revealed that the left landing gear leg had separated and exhibited corrosion. The left landing gear leg was retained and forwarded to the National Transportation Safety Board Materials Laboratory for further examination. Metallurgical examination of the fracture surface revealed a small thumbnail like fatigue region followed by an overstress region.

The single-seat, bi-wing, tailwheel-equipped airplane, serial number DS-1, was assembled from a kit in 1984 and issued an FAA experimental airworthiness certificate. Its most recent condition inspection was completed on April 23, 2016. At that time, the airframe had accumulated 865 total hours of operation. It had flown an additional 11 hours from the time of the last inspection, until the accident.

The FAA inspector that examined the wreckage further stated that a previous owner built the airplane and did not use the stock bungie landing gear that was included with the kit. Rather, to reduce drag, he designed and constructed his own round tapered rod landing gear.