<< >> NASA ASRS Report 830720, April 2009

B737 captain reported auto pressurization failure at FL330. Emergency was declared and descent initiated. Manual control of the system was gained at 18;000 ft and flight continued to destination.

Attributes
ACN	830720
Time
Date	200904
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Pressurization Control System
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Auto-pressurization failure at FL330. Had to descend to lower altitude to regain control of cabin. Cabin continued to climb above 10;000 ft until descending through FL190. Regaining control of pressurization; contacted dispatch and continued to land at ZZZ. Had to declare an emergency because initially ATC could only clear us to FL300; FL240. With the cabin still climbing as we ran the QRH it helped ATC to get our clearance to 12000 ft. Once cabin was restored at 18000 ft we leveled off and got a new clearance for that altitude and continued.

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Original NASA ASRS Text

Title: B737 Captain reported auto pressurization failure at FL330. Emergency was declared and descent initiated. Manual control of the system was gained at 18;000 FT and flight continued to destination.

Narrative: Auto-pressurization failure at FL330. Had to descend to lower altitude to regain control of cabin. Cabin continued to climb above 10;000 FT until descending through FL190. Regaining control of pressurization; contacted dispatch and continued to land at ZZZ. Had to declare an emergency because initially ATC could only clear us to FL300; FL240. With the cabin still climbing as we ran the QRH it helped ATC to get our clearance to 12000 FT. Once cabin was restored at 18000 FT we leveled off and got a new clearance for that altitude and continued.

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.