Noted the following item in the Transport Canada daily occurrence reports for June 29 involving a 727-200 freighter. How frequently is wake turbulence encountered at cruising altitudes?
Kelowna Flightcraft Boeing 727-200 (C-GQKF) operating as KFA 272 was en route from Edmonton, AB to Hamilton, ON at FL 350. While in the vicinity of Winnipeg, MB the flight passed a Boeing 747 travelling in the opposite direction at 1000 feet above. Shortly afterward C-GQKF began to shake from what was described as extreme wake turbulence. The PIC then disengaged the autopilot and the aircraft rolled to the right and descended approximately 300 feet, at which point the PIC regained control and climbed back to the assigned altitude. The flight then continued to Hamilton without further incident.
[Edited 2012-07-22 14:03:17]