Date: 201905
Location: DTW.Airport, MI
Flight conditions: IMC
Weather elements / visibility: Rain
Aircraft: B737-700
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Final Approach
Airspace: Class B DTW
ATC / advisory: TRACON D21
Second aircraft: B757 Undifferentiated or Other Model
Reporter organization: Air Carrier
Reporter function: Captain; Pilot Not Flying
Reporter qualification: Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Anomaly: Aircraft Equipment Problem Less Severe; Deviation - Altitude Excursion From Assigned Altitude; Inflight Event / Encounter Loss Of Aircraft Control; Inflight Event / Encounter Wake Vortex Encounter
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Took Evasive Action; Flight Crew Requested ATC Assistance / Clarification; Flight Crew Executed Go Around / Missed Approach; Flight Crew Regained Aircraft Control
Contributing factors: Environment - Non Weather Related; Procedure
Primary problem: Ambiguous

Narrative: On ILS Y 22R after being cleared for approach. I was Pilot Monitoring; and First Officer was maintaining assigned speed (I believe it was 210 knots); this -700 did not have speed intervention; so First Officer had to disconnect the auto throttles to maintain assigned speed after calling for flaps. There was additional discussion regarding this configuration since the FMC Speed wanted to decelerate to flaps 1 maneuvering.We were established on ILS Y 22R LOC at 4;000 feet; just as glideslope capture was occurring (do not remember if autopilot B had captured GS when we hit wake turbulence). The left wing dipped; and then the aircraft went into a solid right roll. The autopilot did not correct; so First Officer immediately disconnected the autopilot and attempted the upset recovery. I recognized he was using positive control input to correct the upset. While he did not call out 'upset;' it was obvious to me by his handling of the aircraft that he had gone through the [upset training] module; so I continued to monitor. This lasted several seconds. I estimate we entered at least 35 degree bank to the right; and it would not have ceased without our intervention. We did not hear a 'bank angle' warning during the encounter.We had minimal loss of altitude (no more than 200 feet); but this occurred as the Glide Slope came in; so we started to get high on path. I immediately informed TRACON that we had a sizable wake encounter. He then informed us that we were 3 miles behind a 757; he asked if we had sustained any injuries with the encounter. I notified him that I wasn't sure yet and that we would be breaking off the approach. With new ATC instructions; the First Officer continued to hand fly while I tried to bring automation back on line. For some reason; the MCP would not respond to any of my commands. While the First Officer maneuvered with raw data; I reset flight directors and auto throttle; and we were eventually able to get Autopilot B back on line.I assigned comms to the First Officer and I called back to the Purser to ask about their condition. She informed me that people were pretty shaken up but everyone appeared to be in their seats alright (and that she had her best 'poker face' on display); I could tell by her voice that she and the passengers were pretty rattled. I told her I would make a PA explaining what happened and we would be on the ground in the next 10 minutes or so. I made the PA and came back together with the First Officer. I set up for another ILS Y 22R approach while he continued Pilot Flying duties; and the subsequent approach/landing were uneventful.I recall there may have been a slight quartering tailwind at our altitude that contributed to the wake vortices lingering and required the multiple speed reductions by ATC; but the winds on the field were appropriate for the runway in use.




Synopsis: B737-700 Captain reported encountering wake turbulence on approach to DTW in trail of a B757 that they responded to using the prescribed upset recovery procedure.