Narrative:
de Havilland DH-114 Heron LN-SUR, named 'Lars', took off from Trondheim at 08:30 for a domestic flight to Oslo. The flight climbed to a cruising altitude of 8000 feet, reaching Tolga radio beacon at 09:12. Light icing was experienced, which increased rapidly. The Heron started to lose altitude despite of the full use of the de-icing system. The captain elected to return to Trondheim. At 09:50 the aircraft struck Hommelfjell mountain at a height of about 1350 m, bounced in the snow and settled. Parts of the aircraft were used to rebuild Heron LN-NPI, which was damaged on January 26, 1957.
PROBABLE CAUSE: "Unusually heavy icing which the aircraft encountered. Severe downdraft immediately prior to the crash may have been a contributing factor."
Controlled Flight Into Terrain (CFIT) - Mountain
accident date: 07-11-1956
type: de Havilland DH-114 Heron 2B
registration: LN-SUR
accident date: 07-11-1956
type: de Havilland DH-114 Heron 2B
registration: LN-SUR
accident date: 07-11-1956
type: de Havilland DH-114 Heron 2B
registration: LN-SUR
| Status: | Accident investigation report completed and information captured |
| Date: | Wednesday 7 November 1956 |
| Time: | 09:50 |
| Type: |  de Havilland DH-114 Heron 2B |
| Operator: | Braathens SAFE |
| Registration: | LN-SUR |
| MSN: | 14093 |
| First flight: | 1956 |
| Crew: | Fatalities: 1 / Occupants: 2 |
| Passengers: | Fatalities: 1 / Occupants: 10 |
| Total: | Fatalities: 2 / Occupants: 12 |
| Aircraft damage: | Damaged beyond repair |
| Location: | Hummelfjell Mountain ( Norway)
|
| Phase: | En route (ENR) |
| Nature: | Domestic Scheduled Passenger |
| Departure airport: | Trondheim-Værnes Airport (TRD/ENVA), Norway |
| Oslo-Fornebu Airport (FBU/ENFB), Norway | |
| Flightnumber: | 253 |
de Havilland DH-114 Heron LN-SUR, named 'Lars', took off from Trondheim at 08:30 for a domestic flight to Oslo. The flight climbed to a cruising altitude of 8000 feet, reaching Tolga radio beacon at 09:12. Light icing was experienced, which increased rapidly. The Heron started to lose altitude despite of the full use of the de-icing system. The captain elected to return to Trondheim. At 09:50 the aircraft struck Hommelfjell mountain at a height of about 1350 m, bounced in the snow and settled. Parts of the aircraft were used to rebuild Heron LN-NPI, which was damaged on January 26, 1957.
Probable Cause:
PROBABLE CAUSE: "Unusually heavy icing which the aircraft encountered. Severe downdraft immediately prior to the crash may have been a contributing factor."
Classification:
IcingControlled Flight Into Terrain (CFIT) - Mountain
Sources:
» ICAO Accident Digest No.9, Circular 56-AN/51 (10-14)Photos
accident date: 07-11-1956
type: de Havilland DH-114 Heron 2B
registration: LN-SUR
accident date: 07-11-1956
type: de Havilland DH-114 Heron 2B
registration: LN-SUR
accident date: 07-11-1956
type: de Havilland DH-114 Heron 2B
registration: LN-SUR
Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Trondheim-Værnes Airport to Oslo-Fornebu Airport as the crow flies is 393 km (246 miles).
Accident location: Approximate; accuracy within a few kilometers.
Distance from Trondheim-Værnes Airport to Oslo-Fornebu Airport as the crow flies is 393 km (246 miles).
Accident location: Approximate; accuracy within a few kilometers.
This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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