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B757 at FL370 offset course 30 degrees after encountering wake turbulence from opposite direction B747 traffic at FL380.
| Attributes | |
| ACN | 661839 |
| Time | |
| Date | 200506 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zny.artcc |
| State Reference | NY |
| Altitude | msl single value : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : a761.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zny.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Route In Use | enroute airway : a761.airway |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 661839 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter : wake turbulence other spatial deviation |
| Resolutory Action | flight crew : took evasive action |
| Miss Distance | horizontal : 1500 vertical : 1000 |
| Supplementary | |
| Problem Areas | Airspace Structure Environmental Factor |
| Primary Problem | Airspace Structure |
Narrative:
B747 opposite direction traffic called at FL380 on A761. Traffic acquired visually and determined to be sufficiently offset (500 yds) so as not to be a problem. Wind was parallel to the airway at altitude. Aircraft went from smooth to instantaneous moderate turbulence. We took a quick 30 degree cut off the airway and the turbulence stopped within 10 seconds. No injured passenger or any other problems. Surprised that offset wasn't enough and will look for a larger lateral separation next time. Probably need to reemphasize the hidden dangers in the new 1000 ft separation environment.
Original NASA ASRS Text
Title: B757 AT FL370 OFFSET COURSE 30 DEGS AFTER ENCOUNTERING WAKE TURB FROM OPPOSITE DIRECTION B747 TFC AT FL380.
Narrative: B747 OPPOSITE DIRECTION TFC CALLED AT FL380 ON A761. TFC ACQUIRED VISUALLY AND DETERMINED TO BE SUFFICIENTLY OFFSET (500 YDS) SO AS NOT TO BE A PROB. WIND WAS PARALLEL TO THE AIRWAY AT ALT. ACFT WENT FROM SMOOTH TO INSTANTANEOUS MODERATE TURB. WE TOOK A QUICK 30 DEG CUT OFF THE AIRWAY AND THE TURB STOPPED WITHIN 10 SECONDS. NO INJURED PAX OR ANY OTHER PROBS. SURPRISED THAT OFFSET WASN'T ENOUGH AND WILL LOOK FOR A LARGER LATERAL SEPARATION NEXT TIME. PROBABLY NEED TO REEMPHASIZE THE HIDDEN DANGERS IN THE NEW 1000 FT SEPARATION ENVIRONMENT.
Data retrieved from NASA's ASRS site as of January 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.