An A319 flight crew reported a wake vortex encounter in trail of a heavy airbus at FL310.

Attributes
ACN	934193
Time
Date	201102
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Aircraft 1
Make Model Name	A319
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Person 1
Function	First Officer Pilot Flying
Experience	Flight Crew Last 90 Days 240 Flight Crew Total 14000 Flight Crew Type 900
Person 2
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 130 Flight Crew Total 11500 Flight Crew Type 1345
Events
Anomaly	Inflight Event / Encounter Wake Vortex Encounter

Narrative:

In cruise at FL310 at .75 mach with the autopilot engaged. The airplane shuddered and then went into a sudden and uncommanded 50 degree right bank. I disconnected the autopilot and returned the aircraft to a normal attitude. The captain asked center what type of aircraft was ahead of us. Center responded that we were in trail of a heavy. No one was injured in the back of the airplane; although drinks were scattered all over. There were no further incidents for the remainder of the flight.

Original NASA ASRS Text

Title: An A319 flight crew reported a wake vortex encounter in trail of a heavy Airbus at FL310.

Narrative: In cruise at FL310 at .75 mach with the autopilot engaged. The airplane shuddered and then went into a sudden and uncommanded 50 degree right bank. I disconnected the autopilot and returned the aircraft to a normal attitude. The Captain asked Center what type of aircraft was ahead of us. Center responded that we were in trail of a heavy. No one was injured in the back of the airplane; although drinks were scattered all over. There were no further incidents for the remainder of the flight.

Data retrieved from NASA's ASRS site as of April 2012 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.