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Emb-175 first officer reported encountering 'severe' wake turbulence seven miles in trail of a B747 on a visual approach to lax.
| Attributes | |
| ACN | 1250825 |
| Time | |
| Date | 201503 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | LAX.Airport |
| State Reference | CA |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 170/175 ER/LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Route In Use | Visual Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
While in the downwind for runway 24R in lax; we were sequenced behind a 747. We were provided 7 miles of separation from the traffic. While descending through 6;000 feet we encountered wake turbulence. The aircraft rolled right; then left; then right over a 10-15 second period. I do not know what the bank or pitch angles were; but we heard 'bank angle' from the aircraft. The captain; who was the pilot flying; provided full aileron control inputs in both directions to the stops; and in both cases the aircraft continued to bank in the direction opposite of the aileron correction. The wake turbulence was; in a word; severe. We asked for; and received; an altitude above where the 747 leveled off; and a heading off the smo 068 radial. We landed uneventfully and wrote the aircraft up for severe turbulence; whereupon maintenance performed a successful inspection of the aircraft; and we continued to operate the aircraft for the remainder of the day. The controller in this case provided more than adequate separation; and I believe the wake turbulence encounter was due to a fluke of atmospheric conditions. Put simply; we should have never flown through the 747's wake.the captain; as pilot flying; performed a flawless; textbook; wake turbulence recovery. The event; and recovery; mirrored perfectly that which we see in the simulator.
Original NASA ASRS Text
Title: EMB-175 First Officer reported encountering 'severe' wake turbulence seven miles in trail of a B747 on a visual approach to LAX.
Narrative: While in the downwind for runway 24R in LAX; we were sequenced behind a 747. We were provided 7 miles of separation from the traffic. While descending through 6;000 feet we encountered wake turbulence. The aircraft rolled right; then left; then right over a 10-15 second period. I do not know what the bank or pitch angles were; but we heard 'BANK ANGLE' from the aircraft. The captain; who was the pilot flying; provided full aileron control inputs in both directions to the stops; and in both cases the aircraft continued to bank in the direction opposite of the aileron correction. The wake turbulence was; in a word; severe. We asked for; and received; an altitude above where the 747 leveled off; and a heading off the SMO 068 radial. We landed uneventfully and wrote the aircraft up for severe turbulence; whereupon maintenance performed a successful inspection of the aircraft; and we continued to operate the aircraft for the remainder of the day. The controller in this case provided more than adequate separation; and I believe the wake turbulence encounter was due to a fluke of atmospheric conditions. Put simply; we should have never flown through the 747's wake.The captain; as pilot flying; performed a flawless; textbook; wake turbulence recovery. The event; and recovery; mirrored perfectly that which we see in the simulator.
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.