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Accident description
Last updated: 21 October 2017
Status:Final
Date:Sunday 30 September 1979
Time:13:00
Type:Silhouette image of generic DHC6 model; specific model in this crash may look slightly different
de Havilland Canada DHC-6 Twin Otter 200
Operator:West Coast Air
Registration: C-FWAF
C/n / msn: 122
First flight: 1968
Total airframe hrs:13815
Engines: 2 Pratt & Whitney Canada PT6A-20
Crew:Fatalities: 1 / Occupants: 2
Passengers:Fatalities: 1 / Occupants: 14
Total:Fatalities: 2 / Occupants: 16
Airplane damage: Substantial
Airplane fate: Written off (damaged beyond repair)
Location:Porpoise Bay, BC (   Canada)
Phase: Approach (APR)
Nature:Domestic Scheduled Passenger
Departure airport:Vancouver-Coal Harbour SPB, BC (CXH/CYHC), Canada
Destination airport:Sechelt Airport, BC (YHS), Canada
Flightnumber: 106
Narrative:
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.

Classification:

Loss of control

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


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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 Vancouver-Coal Harbour SPB, BC to Sechelt Airport, BC as the crow flies is 51 km (32 miles).
Accident location: Approximate; accuracy within a few kilometers.

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