Narrative:

At 7000 we began the left turn for downwind to runway xx. During the left turn the aircraft continued to bank beyond 30 degrees. It felt like a rollover event. I disconnected the autopilot and autothrottle to recover the aircraft back into wings level state. It felt like a wake turbulence event; but there were no aircraft in front of us. We stabilize the aircraft and turned the autopilot and autothrottle systems back on. We were clear to descend to 5000 feet. Passing 5200 feet we suddenly received a 'climb; climb' and a resolution advisory. There was no prior traffic warning or any other aircraft on the TCAS near us at the time. I noticed a red airplane indication showing an aircraft 200 feet below us. I disconnected the autopilot and autothrottles again and began a climb above the recommended attitude indicator RA line. The first officer called ATC and advised them of our RA climb. ATC responded they had no indication of aircraft in that area. Upon further review; it felt like a false indication; however for it to go into that sort of state that suddenly seemed very peculiar. Our altitude at that point was approximately 5700 feet. We never received a clear of conflict message but all indications disappeared and we returned back to 5000 feet. We were then given a right turn heading south and with the autopilot and on autothrottles back on; and in heading select mode; we began the right turn. Once again the airplane overbanked and I was forced to disconnect the autopilot and a/T a third time; and recover the aircraft. We descended to about 4700 feet and ATC asked us if we were having trouble maintaining altitude. We advise them once again we had hit wake turbulence and we are recovering the aircraft. I determined to hand flying from that point forward as we were cleared the visual approach to runway xx. We landed with no further events. A flight ahead of us also mentioned that they had to hit some wake in the same area.

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Original NASA ASRS Text

Title: B737 flight crew reported banking in excess of 30 degrees in a possible rollover event. Wake turbulence was also reported in the same area by another aircraft. Additionally they experienced false TCAS warnings.

Narrative: At 7000 we began the left turn for downwind to Runway XX. During the left turn the aircraft continued to bank beyond 30 degrees. It felt like a rollover event. I disconnected the autopilot and autothrottle to recover the aircraft back into wings level state. It felt like a wake turbulence event; but there were no aircraft in front of us. We stabilize the aircraft and turned the autopilot and autothrottle systems back on. We were clear to descend to 5000 feet. Passing 5200 feet we suddenly received a 'climb; climb' and a Resolution Advisory. There was no prior traffic warning or any other aircraft on the TCAS near us at the time. I noticed a red airplane indication showing an aircraft 200 feet below us. I disconnected the autopilot and autothrottles again and began a climb above the recommended Attitude indicator RA line. The first officer called ATC and advised them of our RA climb. ATC responded they had no indication of aircraft in that area. Upon further review; it felt like a false indication; however for it to go into that sort of state that suddenly seemed very peculiar. Our altitude at that point was approximately 5700 feet. We never received a clear of conflict message but all indications disappeared and we returned back to 5000 feet. We were then given a right turn heading south and with the autopilot and on autothrottles back on; and in heading select mode; we began the right turn. Once again the airplane overbanked and I was forced to disconnect the autopilot and A/T a third time; and recover the aircraft. We descended to about 4700 feet and ATC asked us if we were having trouble maintaining altitude. We advise them once again we had hit wake turbulence and we are recovering the aircraft. I determined to hand flying from that point forward as we were cleared the visual approach to Runway XX. We landed with no further events. A flight ahead of us also mentioned that they had to hit some wake in the same area.

Data retrieved from NASA's ASRS site 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.