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B737-800 captain reported a 'partial upset' at FL330 when he encountered the wake of a B777 8 miles ahead.
| Attributes | |
| ACN | 1039250 |
| Time | |
| Date | 201209 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZTL.ARTCC |
| State Reference | GA |
| Aircraft 1 | |
| Make Model Name | B737-800 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Aircraft 2 | |
| Make Model Name | B777 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Person 1 | |
| Function | Pilot Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Inflight Event / Encounter Wake Vortex Encounter Inflight Event / Encounter Loss Of Aircraft Control |
Narrative:
At cruise at FL330; 70 NM west of calco we experienced a rapid roll to the right not exceeding 30 degrees angle of bank (aob). [We] took control of aircraft putting airplane into control wheel steering (cws) and control wheel position (cwp) to correct to level flight. No altitude loss. Asked ATC what type of aircraft we were following at FL330 and the spacing. They said it was a B777 at FL330 at 8 miles. Told them we had a partial upset. [ATC] told us to descend to FL290. No passengers were up and about. No injuries to any passengers or flight attendants; continued uneventfully.
Original NASA ASRS Text
Title: B737-800 Captain reported a 'partial upset' at FL330 when he encountered the wake of a B777 8 miles ahead.
Narrative: At Cruise at FL330; 70 NM west of CALCO we experienced a rapid roll to the right not exceeding 30 degrees Angle Of Bank (AOB). [We] took control of aircraft putting airplane into Control Wheel Steering (CWS) and Control Wheel Position (CWP) to correct to level flight. No altitude loss. Asked ATC what type of aircraft we were following at FL330 and the spacing. They said it was a B777 at FL330 at 8 miles. Told them we had a partial upset. [ATC] told us to descend to FL290. No passengers were up and about. No injuries to any passengers or flight attendants; continued uneventfully.
Data retrieved from NASA's ASRS site as of July 2013 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.