INCIDENT | Westjet B38M Enroute Incident: Loss of Cabin Pressure After Both Packs Failed

On October 21, 2023, a Westjet Boeing 737-8 MAX, registration C-GDDR, performing flight WS-2251 from Puerto Vallarta, Mexico to Calgary, Canada, experienced a loss of cabin pressure after both packs failed.


The aircraft was climbing through about FL350 out of Puerto Vallarta when the crew received a left-hand pack caution indication. While working on the related checklist, the right-hand pack caution light was illuminated, and a cabin altitude warning occurred.


The crew found the cabin pressure uncontrollable and donned their oxygen masks. They declared an emergency and initiated an emergency descent initially to FL240, subsequently to 14,000 and 13,000 feet.


After consulting with dispatch, the crew decided to divert to Phoenix, Arizona, USA. The aircraft landed normally and taxied to the apron. The Canadian TSB reported that two people received minor injuries. This incident underscores the importance of effective safety measures and the preparedness of the crew in handling such emergencies. It also highlights the need for continuous improvements in aircraft systems to ensure the safety of passengers and crew.

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