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B757-200 at FL320 had a wake turbulence encounter with opposite direction B747-400 at FL330 while operating in ZLC airspace.
| Attributes | |
| ACN | 655549 |
| Time | |
| Date | 200504 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : zlc.artcc |
| State Reference | UT |
| Altitude | msl bound lower : 32000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zlc.artcc tracon : day.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zlc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : multi engine pilot : cfi pilot : commercial |
| Experience | flight time last 90 days : 250 flight time total : 21000 flight time type : 120 |
| ASRS Report | 655549 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne less severe inflight encounter : wake turbulence |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Supplementary | |
| Problem Areas | Environmental Factor Airspace Structure |
| Primary Problem | Airspace Structure |
Narrative:
Drvsm event with 1000 ft vertical separation and about one half mile lateral separation. The wake turbulence occurred about one min after the other aircraft passed from our 10 O'clock position to our 8 O'clock position. The other aircraft was level at FL330 and we were level at FL320. Callback conversation with reporter revealed the following information: reporter stated that the crew had visual contact with the traffic but no contrail or other indication that it had crossed their track.
Original NASA ASRS Text
Title: B757-200 AT FL320 HAD A WAKE TURB ENCOUNTER WITH OPPOSITE DIRECTION B747-400 AT FL330 WHILE OPERATING IN ZLC AIRSPACE.
Narrative: DRVSM EVENT WITH 1000 FT VERTICAL SEPARATION AND ABOUT ONE HALF MILE LATERAL SEPARATION. THE WAKE TURB OCCURRED ABOUT ONE MIN AFTER THE OTHER ACFT PASSED FROM OUR 10 O'CLOCK POS TO OUR 8 O'CLOCK POS. THE OTHER ACFT WAS LEVEL AT FL330 AND WE WERE LEVEL AT FL320. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE CREW HAD VISUAL CONTACT WITH THE TFC BUT NO CONTRAIL OR OTHER INDICATION THAT IT HAD CROSSED THEIR TRACK.
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.