"A LOT Polish Airlines Boeing 767-300, registration SP-LPA performing flight LO-2 from Chicago O'Hare,IL (USA) to Warsaw (Poland) with 206 passengers and 10 crew, was enroute at FL330 about 9nm eastsoutheast of North Bay,ON (Canada) about 70 minutes into the flight, when the airplane encountered "severe turbulence at high speed" and started to deviate signficantly from assigned altitude. The crew reported later, that their airspeed had become unreliable and requested to divert to Toronto,ON (Canada). During descent towards Toronto the crew reported, that airspeed had returned to be normal and requested to hold to reduce weight. No ambulances were needed. While in the hold and descending, the crew was ordered to stop descent at 16000 feet, the crew was however unable to comply and reported, the airspeed problems had reoccured. The airplane proceeded directly for a safe landing on runway 23 73 minutes after the onset of problems and taxied to a gate.
At the time of the incident air traffic control reported continuous light chop (light turbulence) on all altitudes above FL300, later changed to severe turbulence at FL330 reported by a 763.
The Canadian TSB reported on Jun 22nd, that the airplane was enroute at FL330 near North Bay, when it experienced a sudden and uncommanded overspeed condition, stick shaker and illumination of the left and right hand engine electronic control (EEC) caution lights. The aircraft descended to FL280 before the situation was resolved. The airplane diverted to Toronto, where it landed without further incident. The TSB has dispatched investigators to the site."
http://flightaware.com/live/flight/LOT2/history/20090620/0055Z/KORD/EPWA
