United Airlines 737 suffers cabin pressure loss over Pacific

A United Airlines Boeing 737 at San Francisco SFO.
Photo Credit: Raimond Spekking via Wikimedia Commons.

A United Airlines flight operating from Kahului, Hawaii to San Francisco, CA was forced to initiate an emergency descent and divert to Honolulu after it experienced the loss of cabin pressure whilst en route on 16 February.

United Airlines flight UA1639, a Boeing 737-800 registered N77510, was operating the scheduled service from Kahului (OGG) to San Francisco (SFO) after it experienced a loss of cabin pressure in the cruise over the Pacific Ocean.

Flight UA1639 was in the cruise at flight level FL350 (35,000 feet) at approximately 200 nautical miles from Honolulu when the pressurization incident occurred.

Emergency Descent & Diversion

Flight crew initiated an emergency descent procedure to 10,000 feet and diverted to Honolulu (HNL).

Flight data for the service shows that United flight UA 1639 made an on-time departure out of Kahului (OGG) at 2333 local time on 16 February, before setting because normally and climbing to flight level FL350.


The fight subsequently initiated the high rate emergency descent at approximately 10:12 UTC before laying in a diversion course to Honolulu (HNL), where it landed without further incident just over one hour later.

The flight did not declare a formal emergency, and passenger oxygen masks were deployed as a standard contingency measure following the cabin depressurization.

The aircraft operating the subject UA1639 service to San Francisco was a Boeing 737-800 registered N77510; a 15-year old narrowbody aircraft belonging to the US carrier United Airlines.

The flight service was subsequently cancelled and the aircraft remained grounded at Honolulu for three days after the in-flight incident.

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By Len Varley - Assistant Editor 2 Min Read
2 Min Read
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