WestJet Flight 35 Cabin Depressurization Incident

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.