B757 flight crew reported wake vortex encounter from a preceding A330 at FL390 that resulted in a 45...

Attributes
ACN	1061529
Time
Date	201301
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Aircraft 2
Make Model Name	A330
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Person 1
Function	Pilot Not Flying First Officer
Experience	Flight Crew Last 90 Days 230 Flight Crew Total 13000 Flight Crew Type 4000
Person 2
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 150 Flight Crew Total 20006 Flight Crew Type 8000
Events
Anomaly	Inflight Event / Encounter Wake Vortex Encounter

Narrative:

Ten minutes after passing topps; flying direct to oystr in level flight; FL390; M.80; clear of clouds; encountered wake turbulence. Preceding A330 was 10 miles ahead; slightly left of our track proceeding to steam; FL390. Wind was approximately 65 knots; left quartering tailwind. Incurred approximately 2-3 seconds of light turbulence then aircraft started rolling hard left. Just prior to receiving 'bank angle; bank angle' alert; disconnected autopilot and manually rolled back wings level. Aircraft bank exceeded 45 degrees but unsure of actual bank angle. (No horizon reference available). No loss of altitude and no damage to aircraft. No injuries to crew or passengers. No further encounters.

Original NASA ASRS Text

Title: B757 flight crew reported wake vortex encounter from a preceding A330 at FL390 that resulted in a 45 degree roll to the left.

Narrative: Ten minutes after passing TOPPS; flying direct to OYSTR in level flight; FL390; M.80; clear of clouds; encountered wake turbulence. Preceding A330 was 10 miles ahead; slightly left of our track proceeding to STEAM; FL390. Wind was approximately 65 knots; left quartering tailwind. Incurred approximately 2-3 seconds of light turbulence then aircraft started rolling hard left. Just prior to receiving 'BANK ANGLE; BANK ANGLE' alert; disconnected autopilot and manually rolled back wings level. Aircraft bank exceeded 45 degrees but unsure of actual bank angle. (No horizon reference available). No loss of altitude and no damage to aircraft. No injuries to crew or passengers. No further encounters.

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.