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Last updated: 24 January 2022
Statuts:Enquête Officielle
Date:dimanche 30 septembre 1979
Heure:13:00
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 200
Compagnie:West Coast Air
Immatriculation: C-FWAF
Numéro de série: 122
Année de Fabrication: 1968
Heures de vol:13815
Moteurs: 2 Pratt & Whitney Canada PT6A-20
Equipage:victimes: 1 / à bord: 2
Passagers:victimes: 1 / à bord: 14
Total:victimes: 2 / à bord: 16
Dégats de l'appareil: Substantiels
Conséquences: Written off (damaged beyond repair)
Lieu de l'accident:Porpoise Bay, BC (   Canada)
Phase de vol: En approche (APR)
Nature:Transport de Passagers Nat.
Aéroport de départ:Vancouver-Coal Harbour SPB, BC (CXH/CYHC), Canada
Aéroport de destination:Sechelt Airport, BC (YHS), Canada
Numéro de vol: 106
Détails:
A float-equipped de Havilland Canada DHC-6 Twin Otter passenger plane was damaged beyond repair in an accident at Porpoise Bay, BC, Canada. Of the two crew and 14 passengers on board, the captain died on impact and the first officer received serious injuries. One passenger died later as a result of injuries. Three passengers
received serious injuries and 10 passengers received minor/no injuries.
Flight 106 departed Vancouver Harbour at 12:35 on a domestic flight to Sechelt Airport, BC (YHS) at Porpoise Bay and Powell River. The flight was uneventful until it neared Sechelt. As the aircraft passed over the southern shoreline of Porpoise Bay at about 200 ft. it began to roll to the right. The angle of bank increased to about 90 degrees, with the nose dropping. The aircraft descended and struck the ground in a right wing-down nose-low attitude on the eastern shore of the bay 165 ft from the water.
Initial impact was with the right wing, followed by the right float and the nose of the aircraft. It then cartwheeled and came to rest against trees facing about 110 degrees to the right of the final direction of flight.

Probable Cause:

PROBABLE CAUSE: The right-hand aileron bellcrank-to-aileron rod had separated from the bellcrank end fitting due to an extensive stress corrosion crack. This allowed the right-hand aileron to move up, causing asymmetric lift and irretrievable loss of control. The specified visual inspection of the rods was inadequate to detect stress corrosion cracking. Previous similar failures of flap rods on the DHC-6 had led to airworthiness action by the manufacturer and the DOT but these measures were not applied to the aileron rods which are of similar construction.

Sources:
» CASB Final Report
» The Montreal Gazette - Oct 2, 1979


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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 Vancouver-Coal Harbour SPB, BC et Sechelt Airport, BC est de 51 km (32 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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