An air carrier flight crew flying a B737-300 near atl experienced a loss of pressurization.

Attributes
ACN	479943
Time
Date	200007
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : atl.airport
State Reference	GA
Altitude	msl bound lower : 28000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Controlling Facilities	artcc : zjx.artcc
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : multi engine
Experience	flight time last 90 days : 100 flight time total : 18000 flight time type : 8000
ASRS Report	479943
Person 2
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other controllera other flight crewa other flight crewb
Resolutory Action	controller : separated traffic flight crew : overcame equipment problem flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

In cruise flight at FL350 cabin altitude horn started sounding. Pressurization controller showed cabin altitude at 10000 ft and climbing 500 FPM. Outflow valve showed full close. We put both packs on high flow but cabin continued to climb at 500 FPM. Lower was requested from ATC but he said he was unable due to traffic. We declared an emergency in order to start down and to try and regain control of cabin. At around 31000 ft we regain control of cabin and then leveled at FL280.

Original NASA ASRS Text

Title: AN ACR FLC FLYING A B737-300 NEAR ATL EXPERIENCED A LOSS OF PRESSURIZATION.

Narrative: IN CRUISE FLT AT FL350 CABIN ALT HORN STARTED SOUNDING. PRESSURIZATION CTLR SHOWED CABIN ALT AT 10000 FT AND CLBING 500 FPM. OUTFLOW VALVE SHOWED FULL CLOSE. WE PUT BOTH PACKS ON HIGH FLOW BUT CABIN CONTINUED TO CLB AT 500 FPM. LOWER WAS REQUESTED FROM ATC BUT HE SAID HE WAS UNABLE DUE TO TFC. WE DECLARED AN EMER IN ORDER TO START DOWN AND TO TRY AND REGAIN CTL OF CABIN. AT AROUND 31000 FT WE REGAIN CTL OF CABIN AND THEN LEVELED AT FL280.

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.