The Hummelfjell Accident occurred on 7 November 1956 at 9:50, when a de Havilland Heron crashed into the mountain Hummelfjell in Tolga, Norway. The Braathens SAFE aircraft was on route from Trondheim Airport, Værnes to Oslo Airport, Fornebu. The accident was caused by the aircraft losing altitude after heavy icing, combined with a downdraft. Of the two crew and ten passengers, two were killed. On board the aircraft was Rolf Kirkvaag, who along with one other passenger walked for help the following day. The accident was Braathens SAFE's first fatal accident.

• http://en.wikipedia.org/wiki/Hummelfjell Accident