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| Date: | Friday 22 August 2025 |
| Time: | 16:45 UTC |
| Type: |  Airbus A321-211 |
| Owner/operator: | Air Canada |
| Registration: | C-GITY |
| MSN: | 1611 |
| Year of manufacture: | 2001 |
| Engine model: | CFMI CFM56-5B3/P |
| Fatalities: | Fatalities: 0 / Occupants: 197 |
| Other fatalities: | 0 |
| Aircraft damage: | None |
| Location: | near Toronto-Pearson International Airport, ON (YYZ/CYYZ) -
 Canada
|
| Phase: | Initial climb |
| Nature: | Passenger - Scheduled |
| Departure airport: | Toronto-Pearson International Airport, ON (YYZ/CYYZ) |
| Vancouver International Airport, BC (YVR/CYVR) | |
| Investigating agency: | TSB |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
Air Canada flight AC117, an Airbus A321-200, had departed Toronto Airport, ON (YYZ) when the crew was unable to pressurize the aircraft. They declared an emergency and completed applicable checklist items while circling in the area, before electing to return to YYZ.
The aircraft landed without further incident.
Air Canada maintenance conducted an inspection and determined that the avionics vent valve was faulty. The valve was replaced and the aircraft returned to service.
Sources:
TSB A25O0133
https://www.flightaware.com/live/flight/CGITY/history/20250822/1550Z/CYYZ/CYVR
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 28-Sep-2025 14:16 | ASN | Added |
| 28-Sep-2025 14:20 | ASN | Updated [Aircraft type, Location, Phase, Nature, Source, Damage, Narrative, ] |
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