Braathens SAFE Flight 253 , also known as the Hummelfjell Accident Catastrophe ( ) , occurred Coming_to_be on 7 November 1956 at 9:50 , when a de Havilland Heron crashed Catastrophe into the mountain Hummelfjell in Tolga , Norway .

Braathens SAFE Flight 253 , also known as the Hummelfjell Accident Catastrophe ( ) , occurred Coming_to_be on 7 November 1956 at 9:50 , when a de Havilland Heron crashed Catastrophe into the mountain Hummelfjell in Tolga , Norway .

The pilots were able to turn Change around the aircraft , but it hit Attack Hummelfjell at an altitude of above mean sea level .