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A B757 at FL290 passed eight miles behind a B747 at FL300 and received two moderate wake turbulence jolts.
| Attributes | |
| ACN | 792380 |
| Time | |
| Date | 200806 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl single value : 29000 |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| ASRS Report | 792380 |
| Events | |
| Anomaly | inflight encounter : wake turbulence |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : unable |
| Supplementary | |
| Problem Areas | Environmental Factor |
| Primary Problem | Environmental Factor |
Narrative:
We had leveled off at FL290 for a few minutes. Ride reports were 'smooth' and we indeed had a good ride. We had just turned off the seat belt sign when we encountered what had to be wake turbulence. There was no rolling effect; just two sharp jolts of moderate intensity. The flight attendants said no one was hurt but they were very curious about what caused it. ATC told us that a B747 had crossed eight miles ahead of us at FL300.
Original NASA ASRS Text
Title: A B757 AT FL290 PASSED EIGHT MILES BEHIND A B747 AT FL300 AND RECEIVED TWO MODERATE WAKE TURBULENCE JOLTS.
Narrative: WE HAD LEVELED OFF AT FL290 FOR A FEW MINUTES. RIDE RPTS WERE 'SMOOTH' AND WE INDEED HAD A GOOD RIDE. WE HAD JUST TURNED OFF THE SEAT BELT SIGN WHEN WE ENCOUNTERED WHAT HAD TO BE WAKE TURBULENCE. THERE WAS NO ROLLING EFFECT; JUST TWO SHARP JOLTS OF MODERATE INTENSITY. THE FLT ATTENDANTS SAID NO ONE WAS HURT BUT THEY WERE VERY CURIOUS ABOUT WHAT CAUSED IT. ATC TOLD US THAT A B747 HAD CROSSED EIGHT MILES AHEAD OF US AT FL300.
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.