B737-300 flight crew experiences cabin altitude warning horn at FL370 and after complying with QRH procedures; an emergency descent is initiated with diversion to nearest suitable airport.

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Attributes
ACN	765469
Time
Date	200712
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 37000
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	artcc : zzz.artcc tower : zzz.tower
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 : 223
ASRS Report	765469
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : cabin alt warning
Resolutory Action	flight crew : declared emergency flight crew : diverted to another airport
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Cabin altitude sounded while at cruise FL370. Followed QRH procedures and diverted to ZZZ. Emergency declared and divert to ZZZ.

Original NASA ASRS Text

Title: B737-300 FLT CREW EXPERIENCES CABIN ALTITUDE WARNING HORN AT FL370 AND AFTER COMPLYING WITH QRH PROCEDURES; AN EMERGENCY DESCENT IS INITIATED WITH DIVERSION TO NEAREST SUITABLE ARPT.

Narrative: CABIN ALT SOUNDED WHILE AT CRUISE FL370. FOLLOWED QRH PROCS AND DIVERTED TO ZZZ. EMER DECLARED AND DIVERT TO ZZZ.

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.