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An A319 received moderated wake turbulence one minute after passing three to five miles behind and 100 feet below a B747's altitude.
| Attributes | |
| ACN | 854831 |
| Time | |
| Date | 200910 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZOA.ARTCC |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | A319 |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Experience | Flight Crew Last 90 Days 100 Flight Crew Total 12500 Flight Crew Type 2500 |
| Events | |
| Anomaly | Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
While in cruise at FL290; .79 mach (per ATC request); we were informed of traffic at 12 o'clock; 10 miles; opposite direction; heavy 747 at FL300. We soon saw the traffic; and reported it in sight. It was clear that the traffic was going to pass by the left side of our aircraft by an estimated 3-5 miles; 100 feet above us. About one minute after the aircraft passed; we encountered the 747's wake. It was a pretty violent maybe two second shot of moderate turbulence; followed by smooth air again. Had it lasted longer; I'm sure it would have evolved into severe turbulence; but it was over almost before it began. As soon as I could; I called the flight attendants to check on their well being. All three of them reported that they had been standing up in the rear galley; had come off the floor; and landed again; on their feet. The purser reported a scraped wrist; and another flight attendant reported she had bumped her head on a coffee maker. None requested medical attention. We reported the wake encounter to ATC. After landing; I called maintenance to discuss the incident; and we both agreed that no aircraft parameters were exceeded; and no further action was required.
Original NASA ASRS Text
Title: An A319 received moderated wake turbulence one minute after passing three to five miles behind and 100 feet below a B747's altitude.
Narrative: While in cruise at FL290; .79 Mach (per ATC request); we were informed of traffic at 12 o'clock; 10 miles; opposite direction; heavy 747 at FL300. We soon saw the traffic; and reported it in sight. It was clear that the traffic was going to pass by the left side of our aircraft by an estimated 3-5 miles; 100 feet above us. About one minute after the aircraft passed; we encountered the 747's wake. It was a pretty violent maybe two second shot of moderate turbulence; followed by smooth air again. Had it lasted longer; I'm sure it would have evolved into severe turbulence; but it was over almost before it began. As soon as I could; I called the flight attendants to check on their well being. All three of them reported that they had been standing up in the rear galley; had come off the floor; and landed again; on their feet. The purser reported a scraped wrist; and another Flight Attendant reported she had bumped her head on a coffee maker. None requested medical attention. We reported the wake encounter to ATC. After landing; I called Maintenance to discuss the incident; and we both agreed that no aircraft parameters were exceeded; and no further action was required.
Data retrieved from NASA's ASRS site as of April 2012 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.