A deadly plane crash in 2015 was caused by a fire tornado.
The Transportation Safety Board has wrapped up an investigation into the May 22nd crash that killed pilot William Alexander Garvie Hilts.
He was flying a Conair Air Tractor AT-802A Fire Boss in a series of planes taking on a forest fire northwest of Cold Lake, when the TSB says he encountered a fire whirl, lost control, and veered toward the ground.
The plane was flying too low to recover at that point.
The Board says the pilot would not have seen the tornado-like event, which can form where there is a large heat source, unstable atmosphere, and low winds.
The company he was flying for, Conair Group, commissioned a fire behaviour study, and added a training session on the environmental dangers of forest fires. (kdr)