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MD11 flight crew reported a temporary loss of control due to severe turbulence.
| Attributes | |
| ACN | 1430219 |
| Time | |
| Date | 201703 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | MD-11 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Person 1 | |
| Function | First Officer Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | First Officer Relief Pilot |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Speed All Types Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Weather / Turbulence |
Narrative:
In cruise at FL360; encountered severe turbulence. Autopilot disconnected and I took control of the aircraft manually. Main focus was trying to keep the wings level. Airplane climbed 1500 feet to FL370. Had intermittent stick shaker while trying to keep the wings level. Can't really say how long the event lasted. Probably several minutes. After exiting the severe turbulence we descended back to FL360 and notified ATC of the encounter and altitude deviation. Then continued to our destination. Our route of flight was planned through an area forecasted for moderate turbulence. It turned out to be severe. We weren't painting any weather on the radar. Prior to the severe turbulence encounter we were experiencing light to moderate turbulence. We asked ATC for ride reports but they had none. We had descended from fl 340 to FL300 but that didn't help. Then climbed to FL320 with still no relief. Looked like we could possibly get in the clear at higher altitude so we tried FL360 which is where we encountered the severe turbulence. Don't file a route that has moderate turbulence forecasted on it. Take a longer/different route.
Original NASA ASRS Text
Title: MD11 flight crew reported a temporary loss of control due to severe turbulence.
Narrative: In cruise at FL360; encountered severe turbulence. Autopilot disconnected and I took control of the aircraft manually. Main focus was trying to keep the wings level. Airplane climbed 1500 feet to FL370. Had intermittent stick shaker while trying to keep the wings level. Can't really say how long the event lasted. Probably several minutes. After exiting the severe turbulence we descended back to FL360 and notified ATC of the encounter and altitude deviation. Then continued to our destination. Our route of flight was planned through an area forecasted for moderate turbulence. It turned out to be severe. We weren't painting any weather on the radar. Prior to the severe turbulence encounter we were experiencing light to moderate turbulence. We asked ATC for ride reports but they had none. We had descended from FL 340 to FL300 but that didn't help. Then climbed to FL320 with still no relief. Looked like we could possibly get in the clear at higher altitude so we tried FL360 which is where we encountered the severe turbulence. Don't file a route that has moderate turbulence forecasted on it. Take a longer/different route.
Data retrieved from NASA's ASRS site 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.