B737 Undifferentiated or Other Model
Flight Crew Air Transport Pilot (ATP)
Deviation - Altitude Excursion From Assigned Altitude; Inflight Event / Encounter Wake Vortex Encounter
Flight Crew Returned To Clearance
Procedure; Environment - Non Weather Related
During ILS Runway 31R approach at JFK airport; 3000 ft; level and localizer captured; glideslope armed; we were authorized by ATC to land on 31R as fourth [in line behind a] B747 which was five miles [in front of] us. [ATC] also requested 170 kts until ZULAB; therefore we set flaps 10 and speed was reduced to keep 5 and 7 miles [in trail] due to wake turbulence.Approximately 2 miles before MALDE; suddenly the roll angle [increased to] 35 degrees caused by wake turbulence. Autopilot was disengaged and 'Bank Angle' was [heard] then we lost 200 ft. Recovery maneuver was performed; and the localizer was recovered; [about] 2 miles [from] ZULAB. We told ATC about the event. [They told] us that we could continue with the approach.
B737 pilot reported encountering wake turbulence on approach to JFK in trail of a B747.