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A B757-200 encountered wake turbulence from an opposite direction aircraft that knocked several flight attendants off their feet.
| Attributes | |
| ACN | 793628 |
| Time | |
| Date | 200807 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : czeg.artcc |
| State Reference | AB |
| Altitude | msl single value : 34000 |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Controlling Facilities | artcc : czeg.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| 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 |
| Experience | flight time last 90 days : 170 flight time total : 20000 flight time type : 5000 |
| ASRS Report | 793628 |
| Events | |
| Anomaly | inflight encounter : wake turbulence |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : insufficient time |
| Consequence | other |
| Supplementary | |
| Problem Areas | Environmental Factor |
| Primary Problem | Environmental Factor |
Narrative:
We were at cruise at FL340 in and out of the cloud layer. Did not see approaching aircraft at FL350 due to cloud layer; but shortly after it passed we broke out enough to see a thick contrail descending onto us. I grabbed the yoke while the first officer cycled the seat belt sign a few times and made a quick announcement. We encountered what would be moderate turbulence with a slight rolling motion for a few seconds. After the encounter we called the purser to see if everyone was okay and were told yes. Later it was reported to us that two flight attendants in the rear galley were knocked to the floor and had sore backs.
Original NASA ASRS Text
Title: A B757-200 ENCOUNTERED WAKE TURBULENCE FROM AN OPPOSITE DIRECTION ACFT THAT KNOCKED SEVERAL FLT ATTENDANTS OFF THEIR FEET.
Narrative: WE WERE AT CRUISE AT FL340 IN AND OUT OF THE CLOUD LAYER. DID NOT SEE APPROACHING ACFT AT FL350 DUE TO CLOUD LAYER; BUT SHORTLY AFTER IT PASSED WE BROKE OUT ENOUGH TO SEE A THICK CONTRAIL DSNDING ONTO US. I GRABBED THE YOKE WHILE THE FO CYCLED THE SEAT BELT SIGN A FEW TIMES AND MADE A QUICK ANNOUNCEMENT. WE ENCOUNTERED WHAT WOULD BE MODERATE TURBULENCE WITH A SLIGHT ROLLING MOTION FOR A FEW SECONDS. AFTER THE ENCOUNTER WE CALLED THE PURSER TO SEE IF EVERYONE WAS OKAY AND WERE TOLD YES. LATER IT WAS RPTED TO US THAT TWO FLT ATTENDANTS IN THE REAR GALLEY WERE KNOCKED TO THE FLOOR AND HAD SORE BACKS.
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.