United B752 over Canada on Jan 18th 2013, cabin pressure problems

Last Update: January 28, 2013 / 22:43:37 GMT/Zulu time

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Incident Facts

Date of incident
Jan 18, 2013

Classification
Incident

Airline
United

Flight number
UA-121

Aircraft Registration
N33132

Aircraft Type
Boeing 757-200

ICAO Type Designator
B752

A United Airlines Boeing 757-200, registration N33132 performing flight UA-121 from Barcelona,SP (Spain) to Newark,NJ (USA) with 113 passengers and 7 crew, entered the crossing of the Atlantic Ocean at FL360, however left the Oceanic airspace at FL240. The aircraft diverted to Goose Bay,NL (Canada) for a safe landing.

The aircraft was on the ground in Goose Bay for about one hour before continuing towards Newark. The aircraft climbed to FL380 and was enroute about 570nm northeast of Boston,MA (USA) still over Canada about 40 minutes into the flight when the aircraft performed an emergency descent to 10,000 feet (average rate of descent 4000 fpm) and diverted to Boston,MA for a safe landing about 110 minutes later.

The aircraft departed Boston again after about 2 hours on the ground, climbed to 10,000 feet and reached Newark about 50 minutes later. The airline's website listed N33132 performing the remainder of the passenger flight, radar data show N33132 on flight UA-121 from Boston to Newark at 10,000 feet maximum altitude.

Passengers reported they were advised before departure the aircraft was a different type than normal and would need to stop at Goose Bay for refueling.

The airline confirmed pressurization issues on board of the aircraft, the passenger oxygen masks were not deployed.

The Canadian TSB reported on Jan 28th that the aircraft was enroute at FL380 from Goose Bay to Newark when the crew heard a loud squeal and the cabin altitude increased reaching a maximum of 10,000 feet, the cabin altitude warning and horn activated. The crew donned their oxygen masks, performed an emergency descent and diverted to Boston. The passenger oxygen masks were not released. Maintenance found the forward overboard exhaust valve stuck in the open position. The valve was replaced.
Aircraft Registration Data New!
Registration mark
N33132
Country of Registration
United States
Date of Registration
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Manufacturer
BOEING
Aircraft Model / Type
757-224
Number of Seats
ICAO Aircraft Type
B752
Year of Manufacture
Serial Number
Aircraft Address / Mode S Code (HEX)
Engine Count
Engine Manufacturer
Engine Model
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Engine Type
Pounds of Thrust
Main Owner
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Incident Facts

Date of incident
Jan 18, 2013

Classification
Incident

Airline
United

Flight number
UA-121

Aircraft Registration
N33132

Aircraft Type
Boeing 757-200

ICAO Type Designator
B752

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