Braathens SAFE LN-SUR "Lars" 14093 07.11 1956Took off from Vaernes,Trondheim at 08:30 for a domestic flight to Oslo with 10 passengers and a crew of 2. The flight climbed to a cruising altitude of 8000 feet. Light icing was experienced, which increased rapidly. The Heron started to lose altitude despite of the full use of the de-icing system. They decided to return to Trondheim, but at 09:50 the aircraft struck Hummelfjell mountain at a height of 1350 m.