Light Transport
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 16
Situational Awareness
Inflight Event / Encounter Weather / Turbulence; Inflight Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Separated Traffic; Air Traffic Control Provided Assistance; Flight Crew Returned To Clearance
Aircraft; Environment - Non Weather Related; Procedure
Aircraft X (a CL60) was descending and crossing approx 20 degrees off the flight path and 10 miles behind Aircraft Y (a Boeing B767). Aircraft X reported severe turbulence at approx FL340 that included a 30 degree roll. Questioning aircraft in the vicinity and at the same altitude answered either 'smooth' or 'occasional light chop'. This leads me to believe the Aircraft Y wake was likely the issue. While we are well versed with Aircraft Y wake issues and separation requirements for aircraft that are slow/dirty; I was not aware such a wake issue may be a significant problem with the Aircraft Y clean and in level flight at altitude and another aircraft approx 10 or more miles behind. I did not think; in this case; to issue a wake advisory or suspect such a serious issue might occur.Increase awareness of Aircraft Y wake issues related to aircraft clean and level and better determine an 'average' distance behind the aircraft that may be problematic.
ZOA Controller describes a situation where a smaller CL60 is following a B767 and encounters severe turbulence. The B767 is 10 miles in front of the Challenger.