On 10 January 2008, an Airbus A319-100 being operated by Air Canada on a scheduled passenger flight from Victoria BC to Toronto in night VMC was west of Oroville Washington USA when it was subjected to sudden jolts and then a series of rolls which resulted in an unintended descent of 1400 feet before straight and level flight was regained. During the episode, cabin service was in progress and seat belt signs were off. Cabin service carts were lifted off the floor and struck the ceiling above occupied passenger seats before coming back to rest in the aisle. The flight crew, suspecting a flight control abnormality, declared an emergency and diverted uneventfully, and without further use of the autopilot, to Calgary. Three of the 88 occupants sustained serious injuries and eight sustained minor injuries as a result of falls and collisions with aircraft furnishings.