https://www.cbc.ca/news/canada/briti...port-9.7214588
By the third time the aircraft's engine was started, one of the helicopter's pedals was engaged, which went undetected, and it began rotating quickly. Both ground workers tried to get out of the way, but were stuck multiple times by the tail rotor.
TSB said the pilot was not expecting the helicopter’s rapid rotation and was looking down when the rotation began. The report said the pilot’s attention was split between the maintenance operations and his cellphone, which was connected to a Bluetooth earpiece.