20000421040009A

(.4)Prior to departure the pilot received a weather briefing, which included flight advisories for icing along his intended route of flight. The airplane was in cruise flight at 9,000 feet when the pilot reported he was 'riding in the tops of the clouds.' The pilot requested and was cleared to climb to 11,000 feet. The airplane leveled off at 9,400 feet; then began another climb, and reached a maximum altitude of 9,700 feet. Shortly thereafter, the airplane entered a steep vertical descent, and radar contact was lost. The airplane came to rest at an elevation of about 3,600 feet, in uneven, wooded terrain. Examination of the wreckage did not reveal any evidence of a mechanical failure of the airframe or engine. Satellite data obtained for the flight indicated the potential for icing in the area of the airplane's last radar return. The airplane was not approved for flight into known icing conditions. An airplane weight and balance calculation revealed that the airplane's weight was about 2,945 pounds, and the center of gravity (CG) was about 142.88 inches, at the time of the accident. According to the pilot operating handbook, the maximum certificated gross weight for the airplane was 2,740 pounds. Additionally, the CG range at the maximum certificated gross weight was about 128 to 138 inches. (-23) Mooney N5632H was in cruise at 9000 ft. pilot reported that he was "riding in the tops of the clouds", and requested a climb to 11,000 feet the ntap shows the aircraft reaching 9600 feet then dropping to 8000 feet in about 10 seconds where it disappeared from radar. The aircraft was located by the civil air patrol on April 22, 2000, at about 1245. It appears that it descended vertically causing damage to only one tree. All aircraft components found at the scene. No apparent failure of airframe or engine.