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Upon encountering severe turbulence at FL290 in a non-radar environment; an air carrier flight declared an emergency and descended to a lower altitude. At the time of the encounter the flight was transitioning to a new route as a result of a previous received SIGMET.
| Attributes | |
| ACN | 871889 |
| Time | |
| Date | 201002 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZZ.ARTCC |
| State Reference | FO |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Route In Use | Oceanic |
| Flight Plan | IFR |
| Person 1 | |
| Function | Pilot Not Flying Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 180 Flight Crew Total 19000 Flight Crew Type 6300 |
| Person 2 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 240 Flight Crew Total 21000 Flight Crew Type 9800 |
| Events | |
| Anomaly | Inflight Event / Encounter Weather / Turbulence |
Narrative:
The following occurred while I was on rest-break; so my account is somewhat second-hand. A SIGMET was forwarded from dispatch; along with a report another flight had encountered severe turbulence ahead and slightly south of our planned route. We requested a re-route for turbulence avoidance; as well as a lower altitude. We eventually received a re-route; but a lower altitude was not available. Shortly after commencing the route change; we encountered severe turbulence. The relief PIC elected to declare an emergency and descend the aircraft to FL280; where smooth flight conditions occurred. Revised altitude clearance was subsequently obtained. Crew and passengers were uninjured; as they had been warned and secured earlier. Aircraft was apparently undamaged. Flight continued to destination.
Original NASA ASRS Text
Title: Upon encountering severe turbulence at FL290 in a non-radar environment; an air carrier flight declared an emergency and descended to a lower altitude. At the time of the encounter the flight was transitioning to a new route as a result of a previous received SIGMET.
Narrative: The following occurred while I was on rest-break; so my account is somewhat second-hand. A SIGMET was forwarded from dispatch; along with a report another flight had encountered severe turbulence ahead and slightly south of our planned route. We requested a re-route for turbulence avoidance; as well as a lower altitude. We eventually received a re-route; but a lower altitude was not available. Shortly after commencing the route change; we encountered severe turbulence. The relief PIC elected to declare an emergency and descend the aircraft to FL280; where smooth flight conditions occurred. Revised altitude clearance was subsequently obtained. Crew and passengers were uninjured; as they had been warned and secured earlier. Aircraft was apparently undamaged. Flight continued to destination.
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.