Accident description
Last updated: 24 November 2014
Status:Final
Date:Saturday 2 September 1978
Time:17:42
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:Airwest Airlines
Registration: CF-AIV
C/n / msn: 215
First flight: 1969
Engines: 2 Pratt & Whitney Canada PT6A-20
Crew:Fatalities: 2 / Occupants: 2
Passengers:Fatalities: 9 / Occupants: 11
Total:Fatalities: 11 / Occupants: 13
Airplane damage: Destroyed
Airplane fate: Written off (damaged beyond repair)
Location:Vancouver-Coal Harbour SPB, BC (CXH) (   Canada) show on map
Phase: Approach (APR)
Nature:Domestic Scheduled Passenger
Departure airport:Victoria Harbour, BC, Canada
Destination airport:Vancouver-Coal Harbour SPB, BC (CXH), Canada
Narrative:
The float-equipped Twin Otter passenger plane departed Victoria Harbour at 17:18 for a 20-minute flight to Vancouver Harbour water aerodrome (CXH). At 175 feet, while on final approach, a loud noise was heard. The aircraft yawed to the left and plunged into the harbour in a left-wing and nose-down attitude, 2500 feet short of the landing area.

PROBABLE CAUSE: In-flight failure of the left-hand inboard flap control rod that led to a sudden retraction of the complete left-hand flap system and sudden loss of control. The inboard span-wise push-pull flap control rod (inboard bell-crank to inboard rod) was severely stress-corroded and had at least three longitudinal cracks; the rod had separated from its inboard fitting.

Classification:

Loss of control

Sources:
» CASB Final Report
» ICAO Circular 166-AN/105 (101-115)


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