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B787 flight crew reported a severe wave encounter at FL380 which resulted in a 35 knot overspeed and uncommanded 1000 foot climb.
| Attributes | |
| ACN | 1413417 |
| Time | |
| Date | 201612 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B787 Dreamliner Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Total 7289 Flight Crew Type 411 |
| Person 2 | |
| Function | Pilot Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Total 15270 Flight Crew Type 464 |
| Events | |
| Anomaly | Deviation - Speed All Types Inflight Event / Encounter Weather / Turbulence |
Narrative:
Aircraft encountered severe wave at FL380. The wave onset with no warning or indications and resulted in a 35 knot overspeed accompanied with master warning and siren. With the autopilot engaged; the aircraft made an uncommanded climb of approximately 1000 feet with FMA LNAV and VNAV blanked. The aircraft was brought back to normal flight with selection of flch; heading select; and quick and judicious use of speed brake and throttle closure by the flying pilot. Flight directors were reset and LNAV and VNAV reestablished. We had only light turbulence throughout the event and no issues with the cabin.transmissions were made to aircraft in the area. Several aircraft in the area experienced the same flight conditions.
Original NASA ASRS Text
Title: B787 flight crew reported a severe wave encounter at FL380 which resulted in a 35 knot overspeed and uncommanded 1000 foot climb.
Narrative: Aircraft encountered severe wave at FL380. The wave onset with no warning or indications and resulted in a 35 Knot overspeed accompanied with master warning and siren. With the autopilot engaged; the aircraft made an uncommanded climb of approximately 1000 feet with FMA LNAV and VNAV blanked. The aircraft was brought back to normal flight with selection of FLCH; Heading select; and quick and judicious use of speed brake and throttle closure by the flying pilot. Flight directors were reset and LNAV and VNAV reestablished. We had only light turbulence throughout the event and no issues with the cabin.Transmissions were made to aircraft in the area. Several aircraft in the area experienced the same flight conditions.
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.