Cessna 550 citation encounters wake turbulence from boeing 767.

Attributes
ACN	299774
Time
Date	199503
Day	Sun
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : las
State Reference	NV
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla tower : tul
Operator	general aviation : corporate
Make Model Name	Citation III, VI, VII
Operating Under FAR Part	Part 91
Flight Phase	cruise other
Flight Plan	IFR
Aircraft 2
Operator	common carrier : air carrier
Make Model Name	B767 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 4600 flight time type : 800
ASRS Report	299774
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	conflict : nmac other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : took evasive action flight crew : exited adverse environment flight crew : regained aircraft control
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

We were level at FL330 on J110 eastbound. A B767 was behind and below us. After overtaking us the B767 was climbed through our altitude to, I assume, FL370. We encountered their wake shortly after they climbed through our altitude. The aircraft rolled violently to the left at 30-45 degrees and then to the right and the autoplt disengaged. I regained control manually and made a turn 20 degrees to the right to avoid any further occurrences. I immediately made a complaint to ATC. They approved my turn off course. The controller then said we were 6 mi in-trail at the time of the occurrences. There were no injuries nor mechanical malfunctions. Autoplt re- engaged normally. In the future I will be more observant of other aircraft that are climbed through my altitudes. Also, I don't remember ATC issuing wake turbulence warning. Also, most wake turbulence lessons and pubs concentrate on wake turbulence occurrences during the takeoff and approach phases of flight and very little concerns any wake turbulence in cruise flight. Increased attention about wake turbulence in cruise would be helpful. Callback conversation with reporter revealed the following information: the reporter stated the autoplt was engaged prior to the encounter. The force of the wake caused the autoplt to disconnect. The pilot grabbed the yoke and guided the aircraft away from the wake. Also, in this case the aircraft ahead was climbing through the altitude and not maintaining the same or similar trajectory the reporter aircraft was flying, so the reporter was crossing the wake and not flying along it.

Original NASA ASRS Text

Title: CESSNA 550 CITATION ENCOUNTERS WAKE TURB FROM BOEING 767.

Narrative: WE WERE LEVEL AT FL330 ON J110 EBOUND. A B767 WAS BEHIND AND BELOW US. AFTER OVERTAKING US THE B767 WAS CLBED THROUGH OUR ALT TO, I ASSUME, FL370. WE ENCOUNTERED THEIR WAKE SHORTLY AFTER THEY CLBED THROUGH OUR ALT. THE ACFT ROLLED VIOLENTLY TO THE L AT 30-45 DEGS AND THEN TO THE R AND THE AUTOPLT DISENGAGED. I REGAINED CTL MANUALLY AND MADE A TURN 20 DEGS TO THE R TO AVOID ANY FURTHER OCCURRENCES. I IMMEDIATELY MADE A COMPLAINT TO ATC. THEY APPROVED MY TURN OFF COURSE. THE CTLR THEN SAID WE WERE 6 MI IN-TRAIL AT THE TIME OF THE OCCURRENCES. THERE WERE NO INJURIES NOR MECHANICAL MALFUNCTIONS. AUTOPLT RE- ENGAGED NORMALLY. IN THE FUTURE I WILL BE MORE OBSERVANT OF OTHER ACFT THAT ARE CLBED THROUGH MY ALTS. ALSO, I DON'T REMEMBER ATC ISSUING WAKE TURB WARNING. ALSO, MOST WAKE TURB LESSONS AND PUBS CONCENTRATE ON WAKE TURB OCCURRENCES DURING THE TKOF AND APCH PHASES OF FLT AND VERY LITTLE CONCERNS ANY WAKE TURB IN CRUISE FLT. INCREASED ATTN ABOUT WAKE TURB IN CRUISE WOULD BE HELPFUL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE AUTOPLT WAS ENGAGED PRIOR TO THE ENCOUNTER. THE FORCE OF THE WAKE CAUSED THE AUTOPLT TO DISCONNECT. THE PLT GRABBED THE YOKE AND GUIDED THE ACFT AWAY FROM THE WAKE. ALSO, IN THIS CASE THE ACFT AHEAD WAS CLBING THROUGH THE ALT AND NOT MAINTAINING THE SAME OR SIMILAR TRAJECTORY THE RPTR ACFT WAS FLYING, SO THE RPTR WAS XING THE WAKE AND NOT FLYING ALONG IT.

Data retrieved from NASA's ASRS site as of July 2007 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.