While Returning To The Airport, At About 2,500 Ft Altitude, The Engine Began To Sputter On April 4, 2026, about 1339 eastern daylight time, a Girardeau Samuel G Sonex-A airplane, N106D, was substantially damaged when it was involved in an accident near Martinsburg, WV. The pilot and passenger were not injured. The aircraft was operated as a Title 14 Code of Federal Regulations (CFR) Part 91 personal flight. The pilot reported that 7 to 8 minutes after takeoff from Eastern WV Regional Airport (MRB), the engine exhaust gas temperatures (EGT) began to rise, while operating with a full rich mixture. When the EGTs continued to increase, he elected to return to the airport.