The Transportation Safety Board says there was nothing mechanically wrong with a helicopter that crashed in northern Alberta last May, killing the pilot and a government biologist.
An investigation by the board has determined the pilot lost control of the chopper while trying to find a landing spot in some forest near Fort McMurray.
The board says the aircraft had slowed and wind created the flying phenomenon known as "loss of tail rotor effectiveness."
Two provincial wildlife biologists were on board to collect caribou radio collars in the area.
Kristina Norstrom, who was 39, of Athabasca was killed along with the pilot, Bryce Campbell, who was 35, of Golden, B.C.
The second scientist, Simon Slater, survived the crash but was seriously injured.
An earlier version of this story erroneously featured a picture that was not the crash discussed in the TSB report. The picture was of a crash near Fort Saskatchewan in July 2013 that injured two people.Feb 05, 2014 5:08 PM MT