A B737-500 fltcrew performs an emergency descent after losing cabin pressure and divert to msp, mn.

Attributes
ACN	580623
Time
Date	200304
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : msp.airport
State Reference	MN
Altitude	agl bound lower : 0 agl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zmp.artcc tower : maf.tower
Operator	common carrier : air carrier
Make Model Name	B737-500
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 : captain oversight : pic
Experience	flight time last 90 days : 210 flight time total : 9000 flight time type : 3600
ASRS Report	580623
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : auto fail lite press sys other flight crewa
Resolutory Action	controller : provided flight assist flight crew : diverted to another airport flight crew : declared emergency
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Secondary climb to FL330, automatic fail illuminated and pressurization system went to standby. Irregular procedure performed for automatic fail light on, followed by cabin altitude warning, then initiated emergency descent from the qrc. Diverted to msp and normal landing, no injuries or other problems. Flight attendants notified, dispatch and maintenance were contacted. Masks did not drop in the cabin.

Original NASA ASRS Text

Title: A B737-500 FLTCREW PERFORMS AN EMER DSCNT AFTER LOSING CABIN PRESSURE AND DIVERT TO MSP, MN.

Narrative: SECONDARY CLB TO FL330, AUTO FAIL ILLUMINATED AND PRESSURIZATION SYS WENT TO STANDBY. IRREGULAR PROC PERFORMED FOR AUTO FAIL LIGHT ON, FOLLOWED BY CABIN ALT WARNING, THEN INITIATED EMER DSCNT FROM THE QRC. DIVERTED TO MSP AND NORMAL LNDG, NO INJURIES OR OTHER PROBS. FLT ATTENDANTS NOTIFIED, DISPATCH AND MAINT WERE CONTACTED. MASKS DID NOT DROP IN THE CABIN.

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.