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B747 first officer describes a turbulence encounter with wave action; that results in the aircraft climbing 800 ft above FL350 while exceeding mmo. The event occurred several hundred miles east of japan over the pacific ocean.
| Attributes | |
| ACN | 1015869 |
| Time | |
| Date | 201206 |
| Place | |
| Locale Reference | RJJJ.ARTCC |
| State Reference | FO |
| Environment | |
| Flight Conditions | IMC |
| Aircraft 1 | |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Route In Use | Oceanic |
| Flight Plan | IFR |
| Person 1 | |
| Function | First Officer Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Deviation - Altitude Excursion From Assigned Altitude Deviation - Speed All Types Inflight Event / Encounter Weather / Turbulence Inflight Event / Encounter Loss Of Aircraft Control |
Narrative:
Cruising 35;000 experienced moderate turbulence; of such intensity also accompanied by extreme wave action that the acft deviated from assigned flight level by 800 ft above FL350. The captain disconnected the autopilot to avert exceeding structural limits. The acft also exceeded mmo momentarily. The event lasted approximately 40 to 60 seconds. The captain was able to return to altitude. The remainder of the flight was uneventful.
Original NASA ASRS Text
Title: B747 First Officer describes a turbulence encounter with wave action; that results in the aircraft climbing 800 FT above FL350 while exceeding Mmo. The event occurred several hundred miles east of Japan over the Pacific Ocean.
Narrative: Cruising 35;000 experienced moderate turbulence; of such intensity also accompanied by extreme wave action that the acft deviated from assigned flight level by 800 FT above FL350. The Captain disconnected the autopilot to avert exceeding structural limits. The acft also exceeded Mmo momentarily. The event lasted approximately 40 to 60 seconds. The Captain was able to return to altitude. The remainder of the flight was uneventful.
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.