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Md-11 captain reported a severe turbulence event in oceanic airspace. Captain stated they experienced a 1;500 foot loss of altitude during the event.
| Attributes | |
| ACN | 1430822 |
| Time | |
| Date | 201703 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | KZAK.ARTCC |
| State Reference | HI |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | MD-11 |
| 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) |
| Events | |
| Anomaly | Inflight Event / Encounter Weather / Turbulence Inflight Event / Encounter Loss Of Aircraft Control |
Narrative:
Moderate turbulence forecast along route in this area. Cruising initially at FL340. Descended to FL300; then climbed to FL320; then 360 in attempt to avoid turbulence. At FL360; in light to moderate turbulence with no radar of forward looking infrared (flir) to assist; experienced severe turbulence with associated loss of autopilot control; shortly followed by loss of auto throttle control. As first officer was pilot flying; assisted in providing callouts and throttle control to maintain attitude of aircraft. Commanded heading to avoid area of increased returns. During this episode; we experienced a minimum of two 'stick shaker' warnings; and gained a maximum of 1;500 feet of altitude while maintaining control of the aircraft.the entire episode lasted approximately 3 to 4 minutes. Following; sent cpdlc message to controlling facility; including HF voice comm; followed by communications to company regarding flight and aircraft information.weather conditions that were not foreseen with available onboard equipment.
Original NASA ASRS Text
Title: MD-11 Captain reported a severe turbulence event in oceanic airspace. Captain stated they experienced a 1;500 foot loss of altitude during the event.
Narrative: Moderate turbulence forecast along route in this area. Cruising initially at FL340. Descended to FL300; then climbed to FL320; then 360 in attempt to avoid turbulence. At FL360; in light to moderate turbulence with no radar of Forward Looking Infrared (FLIR) to assist; experienced severe turbulence with associated loss of autopilot control; shortly followed by loss of auto throttle control. As First Officer was pilot flying; assisted in providing callouts and throttle control to maintain attitude of aircraft. Commanded heading to avoid area of increased returns. During this episode; we experienced a minimum of two 'stick shaker' warnings; and gained a maximum of 1;500 feet of altitude while maintaining control of the aircraft.The entire episode lasted approximately 3 to 4 minutes. Following; sent CPDLC message to controlling facility; including HF voice comm; followed by communications to company regarding flight and aircraft information.Weather conditions that were not foreseen with available onboard equipment.
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.