A B737-300 flight crew climbing through FL300 is alerted to a high cabin altitude by the sounding of the cabin altitude aural warning system near flm, ky.

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Attributes
ACN	565349
Time
Date	200211
Day	Sat
Local Time Of Day	1801 To 2400
Place
State Reference	KY
Altitude	msl bound lower : 30000 msl bound upper : 30300
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 190 flight time total : 20000 flight time type : 5000
ASRS Report	565349
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : alt warning horn
Resolutory Action	flight crew : returned to intended or assigned course other
Consequence	other other Other
Supplementary
Problem Areas	Aircraft Maintenance Human Performance Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

Normal climb out through FL300, cabin pressure altitude warning horn aural warning sounded. Cabin altitude indicator displayed slightly greater than 10000 ft, increasing. Crew initiated excessive cabin altitude procedure. Advised ATC of leveloff at FL303, immediate descent required. Cabin continued to climb at 600 FPM. No abnormal pressurization control panel indications. Unable to control cabin altitude. Received immediate descent clearance to 10000 ft. Returned to departure airport.

Original NASA ASRS Text

Title: A B737-300 FLC CLBING THROUGH FL300 IS ALERTED TO A HIGH CABIN ALT BY THE SOUNDING OF THE CABIN ALT AURAL WARNING SYS NEAR FLM, KY.

Narrative: NORMAL CLBOUT THROUGH FL300, CABIN PRESSURE ALT WARNING HORN AURAL WARNING SOUNDED. CABIN ALT INDICATOR DISPLAYED SLIGHTLY GREATER THAN 10000 FT, INCREASING. CREW INITIATED EXCESSIVE CABIN ALT PROC. ADVISED ATC OF LEVELOFF AT FL303, IMMEDIATE DSCNT REQUIRED. CABIN CONTINUED TO CLB AT 600 FPM. NO ABNORMAL PRESSURIZATION CTL PANEL INDICATIONS. UNABLE TO CTL CABIN ALT. RECEIVED IMMEDIATE DSCNT CLRNC TO 10000 FT. RETURNED TO DEP ARPT.

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.