BAe 125 Series 800
Flight Crew Air Transport Pilot (ATP)
Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Wake Vortex Encounter
Air Traffic Control Issued New Clearance; Flight Crew Took Evasive Action
Environment - Non Weather Related; Procedure
Enroute to LAS at FL320. Smooth ride and clear. TCAS was inop on our aircraft; and deferred by MEL. Encountered a sudden very hard jolt of turbulence and then within seconds the aircraft was being rapidly rolled; with considerable turbulence as well. Do not recall which direction. Possibly both directions. Autopilot was disconnected and substantial aileron was required to return to level flight. This happened again at which time we notified ATC that we had encountered wake turbulence and were in a descent. ATC cleared us down to FL300. After enquiring about other aircraft in our vicinity; ATC stated that we were ten miles in trail of a heavy 767 also at FL320; which obviously was the source of the wake encounter. They had us slow down so as to increase the separation; as we were both enroute to LAS. No other wake turbulence was encountered and no passengers were onboard. An operable TCAS may have helped to avoid this encounter as we could have been aware of the proximity of the other aircraft and inquired as to what type we were following. Also; an inoperable TCAS system should be a grounding discrepancy. In today's airspace; it is not wise to fly without TCAS for numerous reasons.
HS-125-800XP Captain reported wake vortex encounter in 10-mile trail of a B767 on arrival to LAS.