Back Braathens-S.A.F.E.-Flug 253 German Voo 253 de Braathens SAFE GL Hummelfjell-ulukka NN Hummelfjell-ulykken NB
 Crash site of Flight 253 | |
| Accident | |
|---|---|
| Date | 7 November 1956 |
| Summary | Crashed due to icing conditions |
| Site | Hummelfjell 62°24′14″N 11°16′52″E / 62.404°N 11.281°E |
| Aircraft | |
| Aircraft type | de Havilland DH-114 Heron 2B |
| Aircraft name | Lars |
| Operator | Braathens SAFE |
| Registration | LN-SUR |
| Flight origin | Trondheim Airport, Værnes |
| Destination | Oslo Airport, Fornebu |
| Occupants | 12 |
| Passengers | 10 |
| Crew | 2 |
| Fatalities | 2 |
| Survivors | 10 |
Braathens SAFE Flight 253, also known as the Hummelfjell Accident (Norwegian: Hummelfjell-ulykken), occurred on 7 November 1956 at 9:50, when a de Havilland Heron crashed into Hummelfjell mountain in Tolga, Norway. The Braathens SAFE aircraft was en route from Trondheim Airport, Værnes to Oslo Airport, Fornebu. While passing Røros, the Heron started experiencing a rapid atmospheric icing which soon was too extensive for the ice protection system to handle. Combined with a downdraft, the aircraft lost sufficient lift to stay airborne. The pilots were able to turn the aircraft around, but it nevertheless hit Hummelfjell at an altitude of 1,350 meters (4,430 ft) above mean sea level.
The aircraft's captain was killed on impact, and a passenger died shortly afterwards. Ten people survived the crash, which was the first fatal accident of a Braathens SAFE. Among the survivors was Rolf Kirkvaag, at the time Norway's most popular radio host. The search and rescue operation was severely hindered by a blizzard and poor visibility. Kirkvaag and another person left the plane after a day and met a rescue party. The investigation concluded that neither technical faults with the aircraft nor pilot error played a part in the incident, and that it was not possible to predict the weather conditions which caused the icing.