A B727-200 in cruise declared an emergency and diverted due to loss of cabin pressurization caused by a failed outflow valve.

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Attributes
ACN	375412
Time
Date	199707
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : obk
State Reference	IL
Altitude	msl bound lower : 31000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : pvd
Operator	common carrier : air carrier
Make Model Name	B727-200
Operating Under FAR Part	Part 121
Flight Phase	cruise other other other
Route In Use	enroute airway : zau
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : cfi pilot : flight engineer
Experience	flight time last 90 days : 240 flight time total : 9000 flight time type : 2400
ASRS Report	375412
Person 2
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : instrument pilot : flight engineer pilot : commercial
Experience	flight time last 90 days : 90 flight time total : 8200 flight time type : 120
ASRS Report	375306
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa other other : unspecified cockpit
Resolutory Action	flight crew : declared emergency none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Air carrier flight dtw-las departed 2 hours late due to previous write-up of the pressure controller of aircraft xyz. Maintenance repaired the pressure controller -- and signed the aircraft for return to service. After departing dtw en route to las and just after leveloff at our cruise altitude of FL310, the captain noticed the cabin pressure exceeding 10000 ft upon which the cabin altitude warning activated. The captain and crew immediately donned our oxygen masks and begin working with the red bordered emergency checklist. At that point in time, the captain relinquished control of the aircraft to me (first officer) and began working with the flight engineer as I descended to 10000 ft in coordination with ATC after declaring an emergency. Upon reaching 10000 ft with ATC clearance we began dumping fuel to our required landing weight. The captain and engineer were unable to control the cabin with any of our procedures. When the cabin was completely depressurized we returned to chicago O'hare for landing. Upon arrival maintenance found the air-conditioner controller completed frozen. No personal injury or damage occurred during this procedure, to crew, passenger or the aircraft.

Original NASA ASRS Text

Title: A B727-200 IN CRUISE DECLARED AN EMER AND DIVERTED DUE TO LOSS OF CABIN PRESSURIZATION CAUSED BY A FAILED OUTFLOW VALVE.

Narrative: ACR FLT DTW-LAS DEPARTED 2 HRS LATE DUE TO PREVIOUS WRITE-UP OF THE PRESSURE CTLR OF ACFT XYZ. MAINT REPAIRED THE PRESSURE CTLR -- AND SIGNED THE ACFT FOR RETURN TO SVC. AFTER DEPARTING DTW ENRTE TO LAS AND JUST AFTER LEVELOFF AT OUR CRUISE ALT OF FL310, THE CAPT NOTICED THE CABIN PRESSURE EXCEEDING 10000 FT UPON WHICH THE CABIN ALT WARNING ACTIVATED. THE CAPT AND CREW IMMEDIATELY DONNED OUR OXYGEN MASKS AND BEGIN WORKING WITH THE RED BORDERED EMER CHKLIST. AT THAT POINT IN TIME, THE CAPT RELINQUISHED CTL OF THE ACFT TO ME (FO) AND BEGAN WORKING WITH THE FE AS I DSNDED TO 10000 FT IN COORD WITH ATC AFTER DECLARING AN EMER. UPON REACHING 10000 FT WITH ATC CLRNC WE BEGAN DUMPING FUEL TO OUR REQUIRED LNDG WT. THE CAPT AND ENGINEER WERE UNABLE TO CTL THE CABIN WITH ANY OF OUR PROCS. WHEN THE CABIN WAS COMPLETELY DEPRESSURIZED WE RETURNED TO CHICAGO O'HARE FOR LNDG. UPON ARR MAINT FOUND THE AIR-CONDITIONER CTLR COMPLETED FROZEN. NO PERSONAL INJURY OR DAMAGE OCCURRED DURING THIS PROC, TO CREW, PAX OR THE ACFT.

Data retrieved from NASA's ASRS site as of July 2007 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.