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| Date: | Monday 16 December 2019 |
| Time: | |
| Type: |  Boeing 787-9 Dreamliner |
| Owner/operator: | Air Canada |
| Registration: | C-FRSE |
| MSN: | 37181/523 |
| Year of manufacture: | 2017 |
| Fatalities: | Fatalities: 0 / Occupants: 297 |
| Other fatalities: | 0 |
| Aircraft damage: | None |
| Category: | Incident |
| Location: | 75 nm SW of Arctic Bay, NU -
 Canada
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Toronto-Pearson International Airport, ON (YYZ/CYYZ) |
| Beijing-Capital International Airport (PEK/ZBAA) | |
| Investigating agency: | TSB |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
Flight AC-31 from Toronto,ON (Canada) to Beijing (China) with 297 people on board, was enroute at FL340 about 75nm southwest of Arctic Bay, NU and about 1700nm north of Toronto when the left hand engine (GEnx) accelerated itself without any command by pilots or autothrust. The pilots reduced the thrust lever by about 1.5 inches to compensate. After consultation with dispatch and maintenance the crew decided to return to Toronto, declared PAN PAN and landed safely back in Toronto about 4 hours after the decision to return
Sources:
TC CADORS
https://www.flightaware.com/live/flight/ACA31/history/20191216/1935Z/CYYZ/ZBAA
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 15-Jan-2025 07:21 | Justanormalperson | Added |
| 15-Jan-2025 07:22 | ASN | Updated [Location, Source, ] |
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