Alaska B737 near Vancouver on Jul 25th 2021, loss of cabin pressure

Last Update: July 30, 2021 / 20:06:03 GMT/Zulu time

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Incident Facts

Date of incident
Jul 25, 2021

Classification
Incident

Aircraft Registration
N627AS

Aircraft Type
Boeing 737-700

ICAO Type Designator
B737

An Alaska Airlines Boeing 737-700, registration N627AS performing freight flight AS-7004 from Seattle,WA to Ketchikan,AK (USA) with 2 crew, was enroute at FL400 about 90nm northwest of Vancouver,BC (Canada) when the crew received a "Cabin Altitude" warning and the cabin altitude horn sounded. The crew donned their oxygen masks and initiated an emergency descent. The crew selected the pressurization selector to manual. When the aircraft descended through 10,000 feet the cabin altitude indication ceased, the aircraft levelled at 9000 feet. The aircraft returned to Seattle for a safe landing about 85 minutes after departure.

The Canadian TSB reported maintenance found the outflow valve did not fully close in both automatic and manual operation. The valve was replaced.
Aircraft Registration Data
Registration mark
N627AS
Country of Registration
United States
Date of Registration
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Manufacturer
BOEING
Aircraft Model / Type
737-790
Number of Seats
ICAO Aircraft Type
B737
Year of Manufacture
Serial Number
Aircraft Address / Mode S Code (HEX)
Engine Count
Engine Manufacturer
Engine Model
Engine Type
Pounds of Thrust
Main Owner
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Incident Facts

Date of incident
Jul 25, 2021

Classification
Incident

Aircraft Registration
N627AS

Aircraft Type
Boeing 737-700

ICAO Type Designator
B737

This article is published under license from Avherald.com. © of text by Avherald.com.
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