Air Canada A320 near Thunder Bay on Jan 20th 2014, wake turbulence enroute rolls the aircraft to 40 degrees

An Air Canada Airbus A320-200, registration C-FKCK performing flight AC-263 from Toronto,ON to Winnipeg,MB (Canada) with 133 people on board, was enroute at FL360 near Thunder Bay,ON (Canada) in 45 degrees cross winds when the crew reported the aircraft had unexpectedly and uncommandedly rolled left to 40 degrees of bank. The crew stabilized the aircraft and continued to Winnipeg for a safe landing.

The Canadian TSB reported the aircraft was trailing flight AC-121 from Toronto to Calgary,AB (Canada) flown by a Boeing 777-300 registration C-FIUL with the required separation between the aircraft. The Airbus experienced wake turbulence from the Boeing.