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Embraer regional jet flight crew reported experiencing a 'violent' roll to the right on approach to cyul 7 miles in trail of a B777.
| Attributes | |
| ACN | 1619356 |
| Time | |
| Date | 201902 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | CYUL.Airport |
| State Reference | PQ |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | Embraer Jet Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | B777 Undifferentiated or Other Model |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Multiengine Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument |
| Events | |
| Anomaly | ATC Issue All Types Deviation - Procedural Published Material / Policy Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Wake Vortex Encounter |
Narrative:
On final approach; aircraft started a violent uncommanded right roll. The autopilot disengaged and we got an 'autopilot fail' caution message. Captain and first officer both grabbed the controls before the captain called 'my aircraft'. Captain reestablished control and hit the auto pilot disconnect to silence the alarm. With the aircraft under control and well above 1;000 feet; captain continued the approach by hand; staying above glide path on approach. [We] asked ATC if were following a heavy. ATC confirmed we were 7 miles in trail of a B777.sudden right roll detective by outside reference and instrument scan. Autopilot disconnecting by master warning and autopilot aural warning. Wake turbulence from a B777 7 miles ahead. Regained manual control and stayed high of glide slope to avoided further wake encounters. ATC should have warned us we were following a heavy. Also ATC and the other aircraft were conversing in french so we were not even aware of a heavy on freq. All aircraft and ATC conversing in one language would have reduced the possibility of this happening.
Original NASA ASRS Text
Title: Embraer regional jet flight crew reported experiencing a 'violent' roll to the right on approach to CYUL 7 miles in trail of a B777.
Narrative: On final approach; aircraft started a violent uncommanded right roll. The autopilot disengaged and we got an 'autopilot fail' caution message. Captain and First Officer both grabbed the controls before the Captain called 'My aircraft'. Captain reestablished control and hit the auto pilot disconnect to silence the alarm. With the aircraft under control and well above 1;000 feet; Captain continued the approach by hand; staying above glide path on approach. [We] asked ATC if were following a heavy. ATC confirmed we were 7 miles in trail of a B777.Sudden right roll detective by outside reference and instrument scan. Autopilot disconnecting by master warning and autopilot aural warning. Wake turbulence from a B777 7 miles ahead. Regained manual control and stayed high of glide slope to avoided further wake encounters. ATC should have warned us we were following a heavy. Also ATC and the other aircraft were conversing in French so we were not even aware of a heavy on freq. All aircraft and ATC conversing in one language would have reduced the possibility of this happening.
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.