B-737 crew gets cabin altitude warning horn at FL350 and descends.

Attributes
ACN	721597
Time
Date	200612
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : zob.artcc
State Reference	OH
Altitude	msl single value : 35000
Environment
Flight Conditions	IMC
Aircraft 1
Controlling Facilities	artcc : zob.artcc
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Experience	flight time last 90 days : 150 flight time total : 15000 flight time type : 4000
ASRS Report	721597
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical
Resolutory Action	controller : issued new clearance flight crew : diverted to another airport flight crew : landed as precaution flight crew : declared emergency
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

During cruise at FL350 the cabin altitude horn sounded; and we did lose control of cabin pressure. Executed qrc and subsequent checklists and diverted to dtw for a normal landing. No passenger injuries occurred. This was our 3RD flight during this duty period. Crew desk was hoping we would continue working but was very understanding that after our emergency descent in night/IFR/icing conditions that I decided to call it a day.

Original NASA ASRS Text

Title: B-737 CREW GETS CABIN ALTITUDE WARNING HORN AT FL350 AND DESCENDS.

Narrative: DURING CRUISE AT FL350 THE CABIN ALT HORN SOUNDED; AND WE DID LOSE CTL OF CABIN PRESSURE. EXECUTED QRC AND SUBSEQUENT CHKLISTS AND DIVERTED TO DTW FOR A NORMAL LNDG. NO PAX INJURIES OCCURRED. THIS WAS OUR 3RD FLT DURING THIS DUTY PERIOD. CREW DESK WAS HOPING WE WOULD CONTINUE WORKING BUT WAS VERY UNDERSTANDING THAT AFTER OUR EMER DSCNT IN NIGHT/IFR/ICING CONDITIONS THAT I DECIDED TO CALL IT A DAY.

Data retrieved from NASA's ASRS site as of January 2009 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.