Mar 20, 2013 / 3:52 pm
The investigation into a deadly northern plane crash has found it was caused by a combination of marginal weather and the pilot's marijuana use.
The pilot and one passenger were killed when the Air Tindi plane went down near a community on the east arm of Great Slave Lake in October 2011.
A Transportation Safety Board investigation found the weather that day was rainy and overcast with poor visibility.
"The aircraft was flown at low altitude into an area of low forward visibility, which prevented the pilot from seeing and avoiding terrain," the investigation concludes. "Weather during the accident flight was marginal for (visual flight rules) flight."
The Cessna 208B Caravan did not have electronic aids such as a terrain awareness and warning system or terrain-warning GPS. But it was fully equipped for instrument flying and the pilot and the company were qualified in such navigation.
"Flying under (instrument flight rules) would have provided a margin of safety given the weather conditions," the board wrote. "It could not be determined why the pilot chose to fly under (visual flight rules)."
The report also found the pilot was flying over Great Slave Lake beyond the gliding distance of his airplane.
There was another issue as well.
"Toxicology testing revealed that concentrations of cannabinoids found in the pilot's bloodstream were sufficient to have impaired pilot performance and decision-making during the flight."
Those concentrations were "considerably greater" than levels that impaired pilot performance in flight simulator tests, the report says.
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