Regional Jet 200 ER/LR (CRJ200)
Flight Crew Air Transport Pilot (ATP)
Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Issued New Clearance
Environment - Non Weather Related
On the HYPER 4 arrival into IAD; between the DELRO and BINNS Intersection at 15;000 FT; nine miles behind a Boeing 767; received significant wake turbulence causing significant rolls and yaws. [We] disconnected the autopilot to recover the aircraft. Asked ATC what we were following; and reported the wake encounter. We were given a descent; and allowed to slow as necessary. No further encounters experienced.
CRJ-200 Captain reported significant wake turbulence in trail of a B767 on arrival to IAD.