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Accident description
Last updated: 15 December 2017
Status:Final
Date:Thursday 22 August 2013
Time:ca 19:08
Type:Silhouette image of generic DH3T model; specific model in this crash may look slightly different
de Havilland Canada DHC-3T Vazar Turbine Otter
Operator:Transwest Air
Registration: C-FSGD
C/n / msn: 316
First flight: 1959
Engines: 1 Pratt & Whitney Canada PT6A-135A
Crew:Fatalities: 1 / Occupants: 1
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 1 / Occupants: 1
Airplane damage: Damaged beyond repair
Location:13 km (8.1 mls) SE of Ivanhoe Lake, NT (   Canada)
Phase: En route (ENR)
Nature:Ferry/positioning
Departure airport:Scott Lake Lodge, SK, Canada
Destination airport:Ivanhoe Lake, NT, Canada
Narrative:
A de Havilland Canada DHC-3 Otter crashed near Ivanhoe Lake, NT, Canada. The airplane was en route from Scott Lake, SK.

Probable Cause:

Findings as to causes and contributing factors:
1. During approach to landing on the previous flight, the right-wing leading-edge and wing tip were damaged by impact with several trees.
2. The damage to the aircraft was not evaluated or inspected by qualified personnel prior to take-off.
3. Cumulative unmanaged stressors disrupted the pilot's processing of safety-critical information, and likely contributed to an unsafe decision to depart with a damaged, uninspected aircraft.
4. The aircraft was operated in a damaged condition and departed controlled flight likely due to interference between parts of the failing wing tip, acting under air loads, and the right aileron.

Accident investigation:
cover
Investigating agency: TSB Canada
Status: Investigation completed
Duration: 1 year and 5 months
Accident number: A13C0105
Download report: Final report

Classification:
Loss of control

Sources:
» CADORS 2013C3581


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This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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