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Emb-145 captain reported encountering wake turbulence from a B777 2;000 feet above them in cruise flight that resulted in loss of their autopilot.
| Attributes | |
| ACN | 1632762 |
| Time | |
| Date | 201904 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZBW.ARTCC |
| State Reference | NH |
| Aircraft 1 | |
| Make Model Name | EMB ERJ 145 ER/LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B777 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 Instrument Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
While in cruise flight at FL330; ATC had sped up a B777 behind us to M.85 2;000 feet above our flight level; as it passed us overhead; we then encountered its wake. At the time it passed us; we were in a high layer of cloud cover and had no visual reference to this aircraft. Once we had encountered its wake; our autopilot failed and the pilot flying; (the first officer); hand flew from that point on. ATC was advised; we turned to avoid any further turbulence from the aircraft and given a lower flight level due to no longer being rvsm capable. [We ran] the QRH for autopilot fail on the EICAS. The cabin was contacted and the report from our flight attendant was that no one was injured. During this event; the fasten belt sign was on. Company was sent a maintenance request via ACARS and we landed without any further incidents.
Original NASA ASRS Text
Title: EMB-145 Captain reported encountering wake turbulence from a B777 2;000 feet above them in cruise flight that resulted in loss of their autopilot.
Narrative: While in cruise flight at FL330; ATC had sped up a B777 behind us to M.85 2;000 feet above our flight level; as it passed us overhead; we then encountered its wake. At the time it passed us; we were in a high layer of cloud cover and had no visual reference to this aircraft. Once we had encountered its wake; our autopilot failed and the Pilot Flying; (the First Officer); hand flew from that point on. ATC was advised; we turned to avoid any further turbulence from the aircraft and given a lower flight level due to no longer being RVSM capable. [We ran] the QRH for autopilot fail on the EICAS. The cabin was contacted and the report from our flight attendant was that no one was injured. During this event; the fasten belt sign was on. Company was sent a maintenance request via ACARS and we landed without any further incidents.
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.