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WestJet Flight 35 Cabin Depressurization Incident

Kelowna, British Columbia, 120 nm NE, CA

On June 12, 2000, a Boeing 737-200 C-FGWJ operated by WestJet Airlines Ltd. was involved in an aviation accident near Kelowna, British Columbia, 120 nm NE, CA. No fatalities were reported. Investigators recorded the probable cause as: The loss of cabin pressurization resulted from the omission of a checklist item following an interruption during the After Take-off checklist, which prevented the pressurization equipment from being reconfigured for normal flight. This summary draws on records from the Transportation Safety Board of Canada (TSB); 2 related events involving the same aircraft type or operator are linked below.

Sourcesthe Transportation Safety Board of Canada (TSB)Primary reportUpdated 2026-10-18Data APIEditorial standards
Boeing 737-200 C-FGWJ
Photo: San Diego Air & Space Museum Archives / Public domain, via Wikimedia Commons

WestJet Flight 35, a Boeing 737-200, experienced a loss of cabin pressurization after a bleeds-off take-off from Calgary. The aircraft diverted to Kelowna, BC, with no injuries reported.

Incident Overview and Immediate Response WestJet Flight 35, a Boeing 737-200, was en route from Calgary, Alberta, to Abbotsford, British Columbia, when it experienced a loss of cabin pressurization. The aircraft had departed Calgary at 1721 mountain daylight time and reached its planned cruise altitude of flight level 310 approximately 17 minutes later. Shortly after the auxiliary power unit (APU) was shut down at cruise altitude, the cabin altitude warning horn sounded, indicating the cabin altitude had exceeded 10,000 feet. The crew initiated a descent and diverted to Kelowna, British Columbia, where the aircraft landed without further incident. No injuries were reported, and the flight continued to Abbotsford after maintenance actions were completed in Kelowna.

Probable cause

The loss of cabin pressurization resulted from the omission of a checklist item following an interruption during the After Take-off checklist, which prevented the pressurization equipment from being reconfigured for normal flight.

Related events

Same operator

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Frequently asked questions

What happened in the 12 Jun 2000 Boeing 737-200 C-FGWJ accident near Kelowna, British Columbia, 120 nm NE, CA?

WestJet Flight 35, a Boeing 737-200, experienced a loss of cabin pressurization after a bleeds-off take-off from Calgary. The aircraft diverted to Kelowna, BC, with no injuries reported.

Were there any fatalities in the 12 Jun 2000 Boeing 737-200 C-FGWJ accident?

No fatalities were recorded in this accident.

What aircraft was involved and where did it happen?

The accident on 12 Jun 2000 involved a Boeing 737-200 C-FGWJ, operated by WestJet Airlines Ltd., at Kelowna, British Columbia, 120 nm NE, CA.

What was the probable cause of the accident?

The loss of cabin pressurization resulted from the omission of a checklist item following an interruption during the After Take-off checklist, which prevented the pressurization equipment from being reconfigured for normal flight.

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