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Air carrier flight crew reported experiencing severe turbulence which caused momentary excursions from their assigned altitude.
| Attributes | |
| ACN | 1480533 |
| Time | |
| Date | 201709 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | RJJJ.ARTCC |
| State Reference | FO |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Widebody Transport |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| 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 14000 Flight Crew Type 3000 |
| Person 2 | |
| Function | Relief Pilot Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 150 Flight Crew Total 20000 Flight Crew Type 3000 |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Inflight Event / Encounter Weather / Turbulence |
Narrative:
Aircraft was being flown by the first officer (first officer) with the international reserve officer (international relief officer) in left seat. I; the captain; was sleeping in the bunk. I woke up when I felt some bumps than went back to sleep. Upon return to the flight deck the crew informed me of the moderate turbulence and 10 seconds of severe turbulence. They considered the turbulence sever due to the abrupt change in altitude. A drop of 100 feet than a climb of 400 feet which resulted in a caution and altitude alert due to the plane climbing to 38;300 feet. The autopilot remained engaged and the aircraft returned to 38;000 within seconds. The crew informed fukuoka control which begin advising other traffic. Dispatch was notified and an entry was made in the logbook. I followed up with maintenance on the ground in hkg.
Original NASA ASRS Text
Title: Air carrier flight crew reported experiencing severe turbulence which caused momentary excursions from their assigned altitude.
Narrative: Aircraft was being flown by the First Officer (FO) with the International Reserve Officer (IRO) in left seat. I; the Captain; was sleeping in the bunk. I woke up when I felt some bumps than went back to sleep. Upon return to the Flight Deck the crew informed me of the Moderate Turbulence and 10 seconds of Severe Turbulence. They considered the Turbulence Sever due to the abrupt change in altitude. A drop of 100 feet than a climb of 400 feet which resulted in a Caution and Altitude Alert due to the plane climbing to 38;300 feet. The autopilot remained engaged and the aircraft returned to 38;000 within seconds. The crew informed Fukuoka Control which begin advising other traffic. Dispatch was notified and an entry was made in the logbook. I followed up with maintenance on the ground in HKG.
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.