A B727 in cruise experiences a loss of cabin pressure.

Attributes
ACN	437324
Time
Date	199905
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : mol.vortac
State Reference	VA
Altitude	msl single value : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc.artcc
Operator	common carrier : air carrier
Make Model Name	B727 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other vortac
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 18500 flight time type : 3000
ASRS Report	437324
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : altitude alerter
Resolutory Action	aircraft : equipment problem dissipated flight crew : exited adverse environment flight crew : declared emergency
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Flight of may/mon/99. En route from lga-atl at FL310 overheading mol VOR in cruise, the cabin altitude horn sounded. The cabin was at 10000 ft. A rapid descent (emergency descent) was initiated to 10000 ft. As we descended, the cabin quickly stabilized and approaching 14000 ft the cabin stabilized at 4500 ft. The emergency was canceled for the rest of the flight. I contacted our dispatcher and got burn at 14000 ft to atl. The passenger masks never deployed. The aircraft was taken to the hangar for inspection. The last word we got was that nothing was found out, as of yet, as to what caused the problem.

Original NASA ASRS Text

Title: A B727 IN CRUISE EXPERIENCES A LOSS OF CABIN PRESSURE.

Narrative: FLT OF MAY/MON/99. ENRTE FROM LGA-ATL AT FL310 OVERHEADING MOL VOR IN CRUISE, THE CABIN ALT HORN SOUNDED. THE CABIN WAS AT 10000 FT. A RAPID DSCNT (EMER DSCNT) WAS INITIATED TO 10000 FT. AS WE DSNDED, THE CABIN QUICKLY STABILIZED AND APCHING 14000 FT THE CABIN STABILIZED AT 4500 FT. THE EMER WAS CANCELED FOR THE REST OF THE FLT. I CONTACTED OUR DISPATCHER AND GOT BURN AT 14000 FT TO ATL. THE PAX MASKS NEVER DEPLOYED. THE ACFT WAS TAKEN TO THE HANGAR FOR INSPECTION. THE LAST WORD WE GOT WAS THAT NOTHING WAS FOUND OUT, AS OF YET, AS TO WHAT CAUSED THE PROB.

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.