A B737-300 cabin altitude warning horn sounded at cruise so the emergency descent QRH was completed ...

Attributes
ACN	965157
Time
Date	201108
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Pressurization Control System
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 146
Person 2
Function	First Officer
Experience	Flight Crew Last 90 Days 229
Events
Anomaly	Aircraft Equipment Problem Critical

Narrative:

Cabin altitude exceeded 10;000 ft at FL340 cruise and cabin altitude warning horn sounded. No other caution or warning lights were illuminated. Packs and bleeds were normal with good pressure. Oxygen masks were donned. Cabin altitude warning and emergency descent QRH checklists were referenced. The cabin oxygen masks did not drop. Requested immediate descent to 10;000 ft and declared an emergency. The flight attendants were notified of the descent and secured the cabin. Straight ahead approach to a nearby airport was completed with an overweight landing of 117;000 pounds. Taxied to the gate; offloaded passengers; and waited for swap before proceeding on to our filed destination. No passengers or flight attendants expressed any discomfort or concern and all proceed on to our destination.

Original NASA ASRS Text

Title: A B737-300 Cabin Altitude Warning Horn sounded at cruise so the Emergency Descent QRH was completed and the flight diverted to a nearby airport. The cabin oxygen masks did not drop.

Narrative: Cabin altitude exceeded 10;000 FT at FL340 cruise and Cabin Altitude Warning horn sounded. No other caution or warning lights were illuminated. Packs and bleeds were normal with good pressure. Oxygen masks were donned. Cabin Altitude Warning and Emergency Descent QRH Checklists were referenced. The cabin oxygen masks did not drop. Requested immediate descent to 10;000 FT and declared an emergency. The flight attendants were notified of the descent and secured the cabin. Straight ahead approach to a nearby airport was completed with an overweight landing of 117;000 LBS. Taxied to the gate; offloaded passengers; and waited for swap before proceeding on to our filed destination. No passengers or flight attendants expressed any discomfort or concern and all proceed on to our destination.

Data retrieved from NASA's ASRS site as of April 2012 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.

A B737-300 cabin altitude warning horn sounded at cruise so the emergency descent QRH was completed and the flight diverted to a nearby airport. The cabin oxygen masks did not drop.