B717 had a wake vortex encounter at FL340 with an opposite direction B777 at FL350.

Narrative:

We had a wake turbulence encounter at FL340 on an airway in the vicinity of iso. We were in VMC and saw the other aircraft; a B-777; pass 1;000 ft above us going the opposite direction on the airway. Several seconds later the aircraft buffeted slightly; which is not unusual; but then the aircraft rolled about 40 degrees to the right. I disengaged the autopilot and put in opposite control inputs to correct back to a wings level attitude. At the same time; the airspeed footer rose to the aircraft's current speed and the stick shaker activated momentarily. The auto throttles increased power; the stick shaker stopped; and the footer quickly returned to where it had been before; so I did not feel the need to disconnect the auto throttles. We turned on the seat belt sign; and then called the flight attendants to see if they and the passengers were okay. They stated they were okay; and after checking with the passengers; no injuries were reported. When winds aloft are light; consider offsetting track slightly when passing heavy aircraft directly above.

Original NASA ASRS Text

Title: B717 had a wake vortex encounter at FL340 with an opposite direction B777 at FL350.

Narrative: We had a wake turbulence encounter at FL340 on an airway in the vicinity of ISO. We were in VMC and saw the other aircraft; a B-777; pass 1;000 FT above us going the opposite direction on the airway. Several seconds later the aircraft buffeted slightly; which is not unusual; but then the aircraft rolled about 40 degrees to the right. I disengaged the autopilot and put in opposite control inputs to correct back to a wings level attitude. At the same time; the airspeed footer rose to the aircraft's current speed and the stick shaker activated momentarily. The auto throttles increased power; the stick shaker stopped; and the footer quickly returned to where it had been before; so I did not feel the need to disconnect the auto throttles. We turned on the seat belt sign; and then called the flight attendants to see if they and the passengers were okay. They stated they were okay; and after checking with the passengers; no injuries were reported. When winds aloft are light; consider offsetting track slightly when passing heavy aircraft directly above.

Data retrieved from NASA's ASRS site as of July 2013 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	1029922
Time
Date	201208
Local Time Of Day	1801-2400
Place
Locale Reference	ZDC.ARTCC
State Reference	VA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B717 (Formerly MD-95)
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Aircraft 2
Make Model Name	B777 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Wake Vortex Encounter