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Last updated: 3 December 2021
Statuts:
Date:mercredi 7 novembre 1956
Heure:09:50
Type/Sous-type:Silhouette image of generic HERN model; specific model in this crash may look slightly different
de Havilland DH-114 Heron 2B
Compagnie:Braathens SAFE
Immatriculation: LN-SUR
Numéro de série: 14093
Année de Fabrication: 1956
Equipage:victimes: 1 / à bord: 2
Passagers:victimes: 1 / à bord: 10
Total:victimes: 2 / à bord: 12
Dégats de l'appareil: Perte Totale
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Hummelfjell Mountain (   Norvège)
Phase de vol: En vol (ENR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Trondheim-Værnes Airport (TRD/ENVA), Norvège
Aéroport de destination:Oslo-Fornebu Airport (FBU/ENFB), Norvège
Numéro de vol:253
Détails:
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."

Sources:
» ICAO Accident Digest No.9, Circular 56-AN/51 (10-14)


Photos

photo of de-Havilland-DH-114-Heron-2B-LN-SUR
accident date: 07-11-1956
type: de Havilland DH-114 Heron 2B
registration: LN-SUR
photo of de-Havilland-DH-114-Heron-2B-LN-SUR
accident date: 07-11-1956
type: de Havilland DH-114 Heron 2B
registration: LN-SUR
photo of de-Havilland-DH-114-Heron-2B-LN-SUR
accident date: 07-11-1956
type: de Havilland DH-114 Heron 2B
registration: LN-SUR
 

Plan
Ce plan montre l'aéroport de départ ainsi que la supposée destination du vol. La ligne fixe reliant les deux aéroports n'est pas le plan de vol exact.
La distance entre Trondheim-Værnes Airport et Oslo-Fornebu Airport est de 393 km (246 miles).
Accident location: Approximate; accuracy within a few kilometers.

Les informations ci-dessus ne représentent pas l'opinion de la 'Flight Safety Foundation' ou de 'Aviation Safety Network' sur les causes de l'accident. Ces informations prélimimaires sont basées sur les faits tel qu'ils sont connus à ce jour.
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