B737 NG flight crew reported encountering wake turbulence on final approach to ORD in trail of a B777.
Synopsis
B737 NG flight crew reported encountering wake turbulence on final approach to ORD in trail of a B777.
Narrative
We flew the Watson arrival and were assigned runway 28C. We were flown through the localizer by the Approach Controller for spacing and were given a heading to join the localizer from the north side of the localizer. We were sequenced exactly 5 miles behind the plane in front of us. As soon as we turned onto the localizer at 7000 feet we had a wake turbulence encounter. My FO tried to ask the Controller what type of aircraft we were following but he was very busy and didn't answer us. We may have been stepped on. About 15 seconds later we had another very similar wake turbulence encounter. The autopilot did not disengage and there was no damage to the airplane or passengers. Everyone was long strapped in their seats. My FO again asked the controller what we were following. The Controller said we were 5 miles behind a company 737-700 and asked if we had a wake turbulence event. We said we had hit wake turbulence twice now. The Controller asked if anyone was injured and we replied no. He cleared us for the approach and we flew it with no other issues.
Second reporter narrative
The aircraft felt like it hit a wall and rolled left and right. I asked ATC what are we following and they said a 737 and ATC asked if we had a wake turbulence encounter. I stated we had 2. They asked if we had injuries which we responded no. The autopilot never disengaged.
NASA callback
Reporter stated the vector through the localizer set up the wake encounter because of the wind direction.
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Source: NASA Aviation Safety Reporting System (public domain). Reports are voluntary submissions and are not verified by NASA.