Created Tuesday, Sep 9th 2025 19:05Z, last updated Tuesday, Sep 9th 2025 19:05Z
A Delta Boeing 757-200, registration N821DX performing flight
DL-179 from Kevlavik (Iceland) to Detroit,MI (USA) with 189 people on board, was enroute at FL360 about 110nm southwest of Goose Bay,NL (Canada) when the crew initiated an emergency descent to 10,000 feet due to the loss of cabin pressure. The aircraft diverted to Montreal,QC (Canada) for a safe landing on runway 24L about 110 minutes after leaving FL360.
The Canadian TSB reported the flight crew noticed the cockpit temperature was increasing and adjusted the left hand pack. Shortly after the right hand pack failed, 30 seconds later the left hand pack also failed. The crew donned their oxygen masks and initiated an emergency descent, descending through FL280 the cabin altitude rose through 14,000 feet, the passenger oxygen masks automatically deployed. During the diversion the right hand pack resumed operation, the left hand one remained failed.
The aircraft returned to service on Sep 4th 2025.
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