A B737-200 in climb at FL350 had the cabin pressure fail and required an immediate descent to 10000 ft caused by failure of the forward outflow to close.

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Attributes
ACN	420067
Time
Date	199811
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : dyr
State Reference	TN
Altitude	msl bound lower : 35000 msl bound upper : 35000
Environment
Light	Night
Aircraft 1
Controlling Facilities	artcc : zme
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : flight engineer pilot : instrument pilot : atp
Experience	flight time last 90 days : 200 flight time total : 10000 flight time type : 4500
ASRS Report	420067
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : exited adverse environment
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

During climb to FL370 and passing FL350, we had a pressurization abnormal which required an immediate descent. We did not deviate from any clearance to the best of my knowledge. I did not declare an emergency. The flight continued to destination (syr) at 10000 ft MSL. Subsequently, we discovered the forward outflow valve had failed open.

Original NASA ASRS Text

Title: A B737-200 IN CLB AT FL350 HAD THE CABIN PRESSURE FAIL AND REQUIRED AN IMMEDIATE DSCNT TO 10000 FT CAUSED BY FAILURE OF THE FORWARD OUTFLOW TO CLOSE.

Narrative: DURING CLB TO FL370 AND PASSING FL350, WE HAD A PRESSURIZATION ABNORMAL WHICH REQUIRED AN IMMEDIATE DSCNT. WE DID NOT DEVIATE FROM ANY CLRNC TO THE BEST OF MY KNOWLEDGE. I DID NOT DECLARE AN EMER. THE FLT CONTINUED TO DEST (SYR) AT 10000 FT MSL. SUBSEQUENTLY, WE DISCOVERED THE FORWARD OUTFLOW VALVE HAD FAILED OPEN.

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.