Flight Crew Air Transport Pilot (ATP)
Deviation - Altitude Excursion From Assigned Altitude; Inflight Event / Encounter Wake Vortex Encounter
Flight Crew Regained Aircraft Control
Environment - Non Weather Related; Procedure
During ILS approach at JFK 31R runway with localizer and glideslope armed; landing was authorized by ATC as fourth behind B747 at 5 miles and requested hold 170 kts until ZULAB; immediately Flaps 10 were set and speed was reduced to hold distance [at] 5 [to] 7 miles; [wake] vortex turbulence was considered. Then at 2 miles prior to MALDE position; roll to the left side almost 35 degrees was induced by [wake] vortex turbulence; autopilot was disengaged and bank angle alarm was activated; the airplane had lost 200 ft. Immediately a recovery maneuver was [initiated]; [we were] able to reconfigure the localizer and intercept the glideslope at 2800 feet approximately 2 miles before ZULAB; proceeded to inform tower of what happened; [Tower] informed us to continue. The approach and landing phase was continued within established parameters.
B737-800 pilot reported encountering wake turbulence on approach to JFK about 5 miles in trail of a B747.