A B737-300 flight crew conducted an emergency descent following the loss of pressurization at FL330.

Attributes
ACN	950883
Time
Date	201105
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Pressurization Outflow Valve
Person 1
Function	First Officer Pilot Flying
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Cabin lost pressurization at FL330. Declared emergency with center; performed emergency descent and followed appropriate QRH procedures. The captain and I performed our respective seat specific tasks. Maintenance determined the outflow valve was faulty and the cockpit indication of the outflow valve position was not correct.

Original NASA ASRS Text

Title: A B737-300 flight crew conducted an emergency descent following the loss of pressurization at FL330.

Narrative: Cabin lost pressurization at FL330. Declared emergency with Center; performed emergency descent and followed appropriate QRH procedures. The Captain and I performed our respective seat specific tasks. Maintenance determined the outflow valve was faulty and the cockpit indication of the outflow valve position was not correct.

Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.