B757 captain reported two wake vortex encounters that resulted in significant uncommanded roll while...

Narrative:

While descending on the hiley three arrival into mia to cross osogy at FL240 pilot flying had to perform the upset recovery maneuver. Winds were negligible (no wind vector on the FMC map display) and the closest target on TCAS was about 12 miles away. First officer did an outstanding job correcting an uncommanded 20-25 degree roll and maintained altitude within 100 ft. No deviation occurred. While crossing milsy at 16;000 ft thinking we were safe due to greater separation; first officer had to again perform the maneuver but the upset was not as dramatic. We alerted ATC and received an offset. We learned that we were following an airbus A330. ATC provided altitudes and vectors to further avoid wake turbulence. Flight attendants reported that fortunately everyone was seated during the events and that there were no injuries. The seat belt sign was on. Recommend ATC provide greater separation and differing crossing restrictions to aircraft following the airbus A330 especially in no wind conditions. Also recommend that our training department continue to include the upset recovery maneuver in recurrent training cycles. I would also like to commend first officer for his superior airmanship and professionalism.

Original NASA ASRS Text

Title: B757 Captain reported two wake vortex encounters that resulted in significant uncommanded roll while in trail of an A330 into MIA.

Narrative: While descending on the Hiley Three Arrival into MIA to cross OSOGY at FL240 pilot flying had to perform the upset recovery maneuver. Winds were negligible (no wind vector on the FMC map display) and the closest target on TCAS was about 12 miles away. First Officer did an outstanding job correcting an uncommanded 20-25 degree roll and maintained altitude within 100 FT. No deviation occurred. While crossing MILSY at 16;000 FT thinking we were safe due to greater separation; First Officer had to again perform the maneuver but the upset was not as dramatic. We alerted ATC and received an offset. We learned that we were following an Airbus A330. ATC provided altitudes and vectors to further avoid wake turbulence. Flight attendants reported that fortunately everyone was seated during the events and that there were no injuries. The seat belt sign was on. Recommend ATC provide greater separation and differing crossing restrictions to aircraft following the Airbus A330 especially in no wind conditions. Also recommend that our Training Department continue to include the upset recovery maneuver in recurrent training cycles. I would also like to commend First Officer for his superior airmanship and professionalism.

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	1017751
Time
Date	201206
Local Time Of Day	1201-1800
Place
Locale Reference	MIA.Airport
State Reference	FL
Environment
Light	Daylight
Aircraft 1
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Descent
Route In Use	STAR HILEY 3
Flight Plan	IFR
Aircraft 2
Make Model Name	A330
Operating Under FAR Part	Part 129
Flight Phase	Descent
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Inflight Event / Encounter Wake Vortex Encounter

B757 captain reported two wake vortex encounters that resulted in significant uncommanded roll while in trail of an A330 into mia.