On April 29, 1998, at 1205 central daylight time (cdt), a Cessna 305, N201FM, operated by a commercial pilot sustained substantial damage when rolling out after a full stop landing on runway 19 at Fredricktown Regional Airport, Fredricktown, Missouri, the airplane veered to the right, departed the runway, and nosed over. Visual meteorological conditions prevailed at the time of the accident. The personal flight was being conducted under 14 CFR Part 91. There was no flight plan on file. The pilot reported no injuries. The local flight originated at Fredricktown, Missouri, at 1200 cdt. In his written statement, the pilot said that after landing, he applied right rudder to correct a gradual left turning tendency. The airplane abruptly turned to the right. The pilot said that he tried to compensate with left aileron and power. By this time, the airplane had left the runway. The pilot pulled the mixture to full lean. The airplane encountered mud on the down slope of the embankment flanking the runway, and gently nosed over onto its top. A Federal Aviation Administration (FAA) inspector examined the airplane in a hangar at Fredricktown Regional Airport. Both wings were bent downward slightly. The wing spars were bent downward and the bottom fabric skin showed wrinkling. The vertical stabilizer and rudder crushed inward. The propeller was bent forward. Flight control continuity was confirmed. Examination of the engine, wheels, brakes, engine controls, and other airplane systems revealed no anomalies.