Hs-125-800XP captain reported wake vortex encounter in 10-mile trail of a B767 on arrival to las.

Narrative:

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.

Original NASA ASRS Text

Title: HS-125-800XP Captain reported wake vortex encounter in 10-mile trail of a B767 on arrival to LAS.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.

Attributes
ACN	1215770
Time
Date	201411
Local Time Of Day	0601-1200
Place
Locale Reference	ZLA.ARTCC
State Reference	CA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	BAe 125 Series 800
Operating Under FAR Part	Part 91
Flight Phase	Cruise
Flight Plan	IFR
Aircraft 2
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Inflight Event / Encounter Wake Vortex Encounter