On January 22, 1998, about 0730 central standard time, a Beech 65-A90, N911KA, slid off the side of runway 17 and collided with trees during landing at the Robert Sibley Airport, Selmer, Tennessee. The airplane was operated by the pilot under the provisions of Title 14 CFR Part 91, and instrument flight rules. Instrument meteorological conditions prevailed, and an instrument flight rules (IFR) flight plan had been filed. The commercial pilot and sole occupant was not injured, and the airplane sustained substantial damage. The flight originated from Nashville, Tennessee at 0630. According to the pilot, upon landing in heavy rain, the airplane began hydroplaning. He said the airplane departed the left side of the runway, striking trees, which damaged both wings and collapsed the landing gear. A witness stated the airplane touched down in moderate rain.