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| Date: | Thursday 26 June 2025 |
| Time: | 16:40 UTC |
| Type: |  Bombardier CRJ-900LR |
| Owner/operator: | Air Canada Express, opb Jazz |
| Registration: | C-FTJZ |
| MSN: | 15047 |
| Year of manufacture: | 2005 |
| Engine model: | GE CF34-8C5 |
| Fatalities: | Fatalities: 0 / Occupants: |
| Other fatalities: | 0 |
| Aircraft damage: | Unknown |
| Location: | SW of Toronto, ON -
 Canada
|
| Phase: | En route |
| Nature: | Passenger - Scheduled |
| Departure airport: | Saint Louis-Lambert International Airport, MO (STL/KSTL) |
| Toronto-Pearson International Airport, ON (YYZ/CYYZ) | |
| Investigating agency: | TSB |
| Confidence Rating: |  Information verified through data from accident investigation authorities |
Air Canada flight AC8970, a Bombardier CRJ-900LR operated by Jazz,was in the initial descent from FL310 when the crew received a L BLEED DUCT message. During the quick reference handbook procedures, the right bleed valve closed resulting in both packs being inoperable. The crew requested a lower altitude and commenced descent to FL240. The cabin rate of climb increased from 2300 to 3000 feet per minute and climbing. The crew donned their oxygen masks, and the masks dropped automatically in the cabin. The flight crew configured the aircraft for unpressurized flight and declared PAN PAN with ATC. The aircraft landed uneventfully with aircraft rescue and firefighting standing by.
Maintenance found the Bleed Air Manifold duct cracked at a welded joint above the wing anti-ice SOV. The result was a protective shutdown of the bleed air system. The operator submitted a service difficulty report (SDR) for this event. All cabin oxygen generators were replaced.
The aircraft resumed regular service on July 2, 2025.
Sources:
TSB A25O0086
Revision history:
| Date/time | Contributor | Updates |
|---|---|---|
| 26-Jul-2025 08:45 | ASN | Added |
| 26-Jul-2025 08:49 | ASN | Updated [Aircraft type, Operator, Location, Phase, Nature, Narrative, ] |
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