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Last updated: 27 October 2021
Statuts:
Date:jeudi 11 mars 1982
Heure:13:27
Type/Sous-type:Silhouette image of generic DHC6 model; specific model in this crash may look slightly different
de Havilland Canada DHC-6 Twin Otter 300
Compagnie:Widerøes Flyveselskap
Immatriculation: LN-BNK
Numéro de série: 568
Année de Fabrication: 1977
Moteurs: 2 Pratt & Whitney Canada PT6A-27
Equipage:victimes: 2 / à bord: 2
Passagers:victimes: 13 / à bord: 13
Total:victimes: 15 / à bord: 15
Dégats de l'appareil: Détruit
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:6 km (3.8 milles) SE de Gamvik (   Norvège)
Phase de vol: En vol (ENR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Berlevåg Airport (BVG/ENBV), Norvège
Aéroport de destination:Mehamn Airport (MEH/ENMR), Norvège
Numéro de vol:WF933
Détails:
Widerøe Flight 933 was a scheduled domestic service from Kirkenes Airport, Norway to Alta Airport, with intermediate stops at Vadsø Airport, Berlevåg Airport, Mehamn Airport and Honningsvåg Airport.
The Twin Otter left Berlevåg at 13:19 hours on the third leg of the flight. The first officer reported to Mehamn Aerodrome Flight Information Service (AFIS) at 13:22 that the aircraft was at 2,000 feet altitude over the Tanafjord and had an estimated time of arrival of 13:33. Mehamn AFIS radioed Flight 933 at 13:35, but received no answer. The aircraft failed to arrive at was declared missing.
The wreckage was located two days after the accident at a depth of 45 meters in the water off Gamvik, Norway.

The investigation into the cause of the accident concluded that the vertical stabilizer failed in flight in strong turbulent wind conditions.

The accident occurred during a NATO military exercise, within a self-declared no-fly zone for allied military aircraft. A report in 1987 that radar had observed an unidentified aircraft which was on a collision course with the Twin Otter caused a second investigation to be started. It was concluded that the existence of other aircraft in the area could be ruled out; and that no other airborne objects could have caused the accident.
The debate about the accident resurfaced in 1997 when several sources claimed there was new or overlooked evidence of the involvement of NATO aircraft.
The Accident Investigation Board Norway (AIBN) decided in 1997 to investigate the new claims and concluded that there was no evidence to support these claims.
The accident was ordered investigated again in November 2002 after a retired Norwegian air traffic controller said one of the Harrier pilots, involved in a mission about the time of the accident, had requested an immediate landing because of technical problems. The report was published on 20 September 2005. It fully supported the findings of all three previous reports and found no evidence for an impact with a Harrier or any other aircraft.

Probable Cause:

ORIGINAL PROBABLE CAUSE: Overload due to a combination of clear air turbulence, local whirlwind, mountain wave and the pilots spontaneous improper actions.



Photos

photo of DHC-6-Twin-Otter-300-LN-BNK
accident date: 11-03-1982
type: de Havilland Canada DHC-6 Twin Otter 300
registration: LN-BNK
photo of DHC-6-Twin-Otter-300-LN-BNK
accident date: 11-03-1982
type: de Havilland Canada DHC-6 Twin Otter 300
registration: LN-BNK
 

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 Berlevåg Airport et Mehamn Airport est de 47 km (29 miles).
Accident location: Exact; deduced from official accident report.

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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DHC-6 Twin Otter

  • 930+ built
  • 84ème loss
  • 60ème accident fatal
  • le accident 7ème le plus grave (à ce moment là)
  • le accident 35ème le plus grave (en ce moment)
» safety profile

 Norvège
  • le accident 11ème le plus grave (à ce moment là)
  • le accident 13ème le plus grave (en ce moment)
» safety profile