B737-400 flight crew has loss of pressurization; declares emergency; and descends.

Attributes
ACN	727146
Time
Date	200702
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	msl single value : 34000
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	artcc : zzz.artcc
Operator	common carrier : air carrier
Make Model Name	B737-400
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
ASRS Report	727146
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	727147
Events
Anomaly	aircraft equipment problem : critical
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Climbing through 34000 ft; cabin altitude warning horn sounded. Cabin altitude indicated 10000 ft. Followed qrc and QRH procedures and descended to 10000 ft. Cabin altitude never exceeded 12000 ft. Declared emergency for descent. Once level at 10000 ft; all system indicated normal. Terminated the emergency and made normal approach and landing in ZZZ. Passenger oxygen masks did not deploy. No passenger mentioned anything about the event while deplaning in ZZZ. Maintenance found popped aft cargo door seal on aft cargo door.

Original NASA ASRS Text

Title: B737-400 FLT CREW HAS LOSS OF PRESSURIZATION; DECLARES EMER; AND DESCENDS.

Narrative: CLBING THROUGH 34000 FT; CABIN ALT WARNING HORN SOUNDED. CABIN ALT INDICATED 10000 FT. FOLLOWED QRC AND QRH PROCS AND DSNDED TO 10000 FT. CABIN ALT NEVER EXCEEDED 12000 FT. DECLARED EMER FOR DSCNT. ONCE LEVEL AT 10000 FT; ALL SYS INDICATED NORMAL. TERMINATED THE EMER AND MADE NORMAL APCH AND LNDG IN ZZZ. PAX OXYGEN MASKS DID NOT DEPLOY. NO PAX MENTIONED ANYTHING ABOUT THE EVENT WHILE DEPLANING IN ZZZ. MAINT FOUND POPPED AFT CARGO DOOR SEAL ON AFT CARGO DOOR.

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.