Flight crew of large transport declared an emergency due to losing aircraft pressurization and descended at once for landing without further incident.

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Attributes
ACN	276113
Time
Date	199406
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : pit
State Reference	PA
Altitude	msl bound lower : 29000 msl bound upper : 29000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zob tracon : n90
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 190 flight time total : 24500 flight time type : 3000
ASRS Report	276113
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other other
Consequence	faa : investigated Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Cruise flight, FL290. Cabin altitude pressure warning. Cabin pressure at 9500 and rising. Attempt control with alternate system. No help. Tried manual control. No help. Declared emergency. Initiated emergency descent to 14000 ft, cleared to 10000 ft then 8000 ft. Continued to destination, bwi. No injuries, no conflicts. ATC worked well with crew's needs -- responsive and helpful. ZOB to be commended. Aircraft was operating with 1 air conditioning pressure system on MEL. The remaining system failed, resulting in loss of cabin pressure.

Original NASA ASRS Text

Title: FLC OF LGT DECLARED AN EMER DUE TO LOSING ACFT PRESSURIZATION AND DSNDED AT ONCE FOR LNDG WITHOUT FURTHER INCIDENT.

Narrative: CRUISE FLT, FL290. CABIN ALT PRESSURE WARNING. CABIN PRESSURE AT 9500 AND RISING. ATTEMPT CTL WITH ALTERNATE SYS. NO HELP. TRIED MANUAL CTL. NO HELP. DECLARED EMER. INITIATED EMER DSCNT TO 14000 FT, CLRED TO 10000 FT THEN 8000 FT. CONTINUED TO DEST, BWI. NO INJURIES, NO CONFLICTS. ATC WORKED WELL WITH CREW'S NEEDS -- RESPONSIVE AND HELPFUL. ZOB TO BE COMMENDED. ACFT WAS OPERATING WITH 1 AIR CONDITIONING PRESSURE SYS ON MEL. THE REMAINING SYS FAILED, RESULTING IN LOSS OF CABIN PRESSURE.

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.