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B777-200 encountered wake turbulence while flying recommended one mile offset along oceanic track. Engine compressor stall occurred during the encounter.
| Attributes | |
| ACN | 790639 |
| Time | |
| Date | 200806 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : eggx.artcc |
| State Reference | FO |
| Altitude | msl single value : 35000 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute : atlantic |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Experience | flight time last 90 days : 110 flight time total : 9000 flight time type : 110 |
| ASRS Report | 790639 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : relief pilot |
| Experience | flight time last 90 days : 60 flight time total : 9000 flight time type : 35 |
| ASRS Report | 790645 |
| Events | |
| Anomaly | aircraft equipment problem : less severe inflight encounter : wake turbulence |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | flight crew : exited adverse environment |
| Supplementary | |
| Problem Areas | Aircraft Environmental Factor |
| Primary Problem | Environmental Factor |
Narrative:
While crossing atlantic on nat Y we had a 60 knot tailwind and encountered wake turbulence from aircraft along our route ahead of us and immediately heard a 'pop' followed by a second 'pop' approximately 5 seconds later. A third 'pop' was heard approximately 3 seconds later in which I observed a slight engine rollback which immediately recovered. We immediately deslopped (1R) to get out of what appeared to be several aircrafts' contrails and wake turbulence. It seemed that all airlines had slopped 1R. After deslopping we observed no contrails that were actually on the route and experienced no further issues or turbulence. We sent a report in and continued on without further incident. I feel maybe there was a preexisting issue with the left engine because the wake turbulence was not extreme. I also feel we should relook at slopping 1R as SOP. This day it seemed all airplanes in our vicinity were aligned with our flight while we were slopping 1R.
Original NASA ASRS Text
Title: B777-200 ENCOUNTERED WAKE TURB WHILE FLYING RECOMMENDED ONE MILE OFFSET ALONG OCEANIC TRACK. ENG COMPRESSOR STALL OCCURRED DURING THE ENCOUNTER.
Narrative: WHILE CROSSING ATLANTIC ON NAT Y WE HAD A 60 KNOT TAILWIND AND ENCOUNTERED WAKE TURBULENCE FROM AIRCRAFT ALONG OUR ROUTE AHEAD OF US AND IMMEDIATELY HEARD A 'POP' FOLLOWED BY A SECOND 'POP' APPROX 5 SECONDS LATER. A THIRD 'POP' WAS HEARD APPROX 3 SECONDS LATER IN WHICH I OBSERVED A SLIGHT ENGINE ROLLBACK WHICH IMMEDIATELY RECOVERED. WE IMMEDIATELY DESLOPPED (1R) TO GET OUT OF WHAT APPEARED TO BE SEVERAL AIRCRAFTS' CONTRAILS AND WAKE TURBULENCE. IT SEEMED THAT ALL AIRLINES HAD SLOPPED 1R. AFTER DESLOPPING WE OBSERVED NO CONTRAILS THAT WERE ACTUALLY ON THE ROUTE AND EXPERIENCED NO FURTHER ISSUES OR TURBULENCE. WE SENT A REPORT IN AND CONTINUED ON WITHOUT FURTHER INCIDENT. I FEEL MAYBE THERE WAS A PREEXISTING ISSUE WITH THE LEFT ENGINE BECAUSE THE WAKE TURBULENCE WAS NOT EXTREME. I ALSO FEEL WE SHOULD RELOOK AT SLOPPING 1R AS SOP. THIS DAY IT SEEMED ALL AIRPLANES IN OUR VICINITY WERE ALIGNED WITH OUR FLIGHT WHILE WE WERE SLOPPING 1R.
Data retrieved from NASA's ASRS site as of May 2009 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.