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B737-800 pilot reported encountering wake turbulence on approach to jfk about 5 miles in trail of a B747.
| Attributes | |
| ACN | 1442986 |
| Time | |
| Date | 201704 |
| Place | |
| Locale Reference | JFK.Airport |
| State Reference | NY |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 129 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 129 |
| Flight Phase | Final Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Other / Unknown |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
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.
Original NASA ASRS Text
Title: B737-800 pilot reported encountering wake turbulence on approach to JFK about 5 miles in trail of a B747.
Narrative: 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.
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.