Flew into the wooded side of Mount Javor (1,133m) in foggy weather conditions. Cause of the accident: Bad weather conditions on the route and in the vicinity of Mount Javor (1,133 m) N 46ø10.816′ E 015ø 00.908′ near Sveta Planina (Trbovlje) with a low cloud base and poor visibility were the reason that the pilot lost his visual contact with the ground. Due to the current conditions set for the flight, the flight was to be performed under Visual Flight Rules. The pilot tried to keep visual contact with the ground by reducing the altitude, which he succeeded in doing at the beginning of the flight. In approaching Mount Javor (1,133 m) N 46ø10.816′ E 015ø 00.908′ near Sveta Planina (Trbovlje), the aircraft was at an altitude 1,075 m, which was too low above the terrain. The cause of the accident was controlled flight into terrain (CFIT)