Narrative:

Wake turbulence. Oceanic clearance track uniform, FL350, mach .80. Just prior gander cleared us to climb from FL340 to FL350 as per clearance. An air carrier Y 10 NM ahead of my flight was cleared to descend from FL350 to FL330. They were descending at 300 FPM at a speed of mach .84. At approximately FL344 my aircraft started a slow roll to the right to 15 degrees bank and then autoplt started to roll wings level. At 5 degrees right wing down a rapid roll to the right began. I turned off the autoplt at approximately 20 degrees right wing down and with rudder and aileron stopped roll at 30 degrees bank. The roll back to wings level was smooth. No one was injured and no one showed any concern for the roll. I feel that if autoplt was not disconnected the aircraft would have continued to roll. The lesson to be learned from this is ATC should not give crossing altitudes to aircraft in trail. They should provide some offset. There was no altitude loss and I continued climb to FL350.

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Original NASA ASRS Text

Title: B767 CREW ENCOUNTERED WAKE VORTEX OF ANOTHER ACFT.

Narrative: WAKE TURB. OCEANIC CLRNC TRACK UNIFORM, FL350, MACH .80. JUST PRIOR GANDER CLRED US TO CLB FROM FL340 TO FL350 AS PER CLRNC. AN ACR Y 10 NM AHEAD OF MY FLT WAS CLRED TO DSND FROM FL350 TO FL330. THEY WERE DSNDING AT 300 FPM AT A SPD OF MACH .84. AT APPROX FL344 MY ACFT STARTED A SLOW ROLL TO THE R TO 15 DEGS BANK AND THEN AUTOPLT STARTED TO ROLL WINGS LEVEL. AT 5 DEGS R WING DOWN A RAPID ROLL TO THE R BEGAN. I TURNED OFF THE AUTOPLT AT APPROX 20 DEGS R WING DOWN AND WITH RUDDER AND AILERON STOPPED ROLL AT 30 DEGS BANK. THE ROLL BACK TO WINGS LEVEL WAS SMOOTH. NO ONE WAS INJURED AND NO ONE SHOWED ANY CONCERN FOR THE ROLL. I FEEL THAT IF AUTOPLT WAS NOT DISCONNECTED THE ACFT WOULD HAVE CONTINUED TO ROLL. THE LESSON TO BE LEARNED FROM THIS IS ATC SHOULD NOT GIVE XING ALTS TO ACFT IN TRAIL. THEY SHOULD PROVIDE SOME OFFSET. THERE WAS NO ALT LOSS AND I CONTINUED CLB TO FL350.

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.