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B737-700 captain reported an overspeed at FL380 following a wake vortex encounter that could have disconnected the autothrottles.
| Attributes | |
| ACN | 1030421 |
| Time | |
| Date | 201208 |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Experience | Flight Crew Last 90 Days 194 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Speed All Types Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
We leveled off at a cruise altitude of 38;000 ft with the autopilot and autothrottles engaged. As we leveled we encountered light wake turbulence. I was the pilot not flying and was putting away my charts when I heard the clacker and looked up and saw the speed of .827. The first officer was already reducing thrust. We both noted the autothrottles had disengaged. Our best reasoning is that it disconnected when we hit the wake turbulence as we leveled at altitude. I contacted dispatch and maintenance via ACARS to report the event and made a logbook entry. We continued the flight to the final destination. We were met by maintenance and handed the aircraft over to a new crew.
Original NASA ASRS Text
Title: B737-700 Captain reported an overspeed at FL380 following a wake vortex encounter that could have disconnected the autothrottles.
Narrative: We leveled off at a cruise altitude of 38;000 FT with the autopilot and autothrottles engaged. As we leveled we encountered light wake turbulence. I was the pilot not flying and was putting away my charts when I heard the clacker and looked up and saw the speed of .827. The First Officer was already reducing thrust. We both noted the autothrottles had disengaged. Our best reasoning is that it disconnected when we hit the wake turbulence as we leveled at altitude. I contacted Dispatch and Maintenance via ACARS to report the event and made a logbook entry. We continued the flight to the final destination. We were met by Maintenance and handed the aircraft over to a new crew.
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.