CL65 flight crew has loss of cabin pressurization en route to cvg.

Attributes
ACN	594449
Time
Date	200309
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cvg.airport
State Reference	KY
Altitude	msl single value : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
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
Qualification	pilot : multi engine pilot : cfi pilot : atp pilot : commercial
Experience	flight time last 90 days : 180 flight time total : 4680 flight time type : 2615
ASRS Report	594449
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : cabin alt indicator other flight crewa other flight crewb
Resolutory Action	flight crew : overcame equipment problem flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Company Flight Crew Human Performance Aircraft
Primary Problem	Aircraft

Narrative:

At FL310, in cruise flight en route to cvg, both captain and first officer noticed that the cabin altitude was beginning to rise. A pop was then heard and the cabin altitude rose more quickly. Crew oxygen masks were donned and we declared an emergency and rapidly descended to 10000 ft. The emergency checklist was run and at approximately 13000-14000 ft pressurization was restored in manual mode. We then continued for an uneventful landing at our destination. This aircraft had multiple write-ups for pack and environmental system problems recently. Maintenance said that a duct had come loose causing a pressurization loss. The duct came loose from the same aircraft the day after this incident and now maintenance is redesigning the duct attachment.

Original NASA ASRS Text

Title: CL65 FLT CREW HAS LOSS OF CABIN PRESSURIZATION ENRTE TO CVG.

Narrative: AT FL310, IN CRUISE FLT ENRTE TO CVG, BOTH CAPT AND FO NOTICED THAT THE CABIN ALT WAS BEGINNING TO RISE. A POP WAS THEN HEARD AND THE CABIN ALT ROSE MORE QUICKLY. CREW OXYGEN MASKS WERE DONNED AND WE DECLARED AN EMER AND RAPIDLY DSNDED TO 10000 FT. THE EMER CHKLIST WAS RUN AND AT APPROX 13000-14000 FT PRESSURIZATION WAS RESTORED IN MANUAL MODE. WE THEN CONTINUED FOR AN UNEVENTFUL LNDG AT OUR DEST. THIS ACFT HAD MULTIPLE WRITE-UPS FOR PACK AND ENVIRONMENTAL SYS PROBS RECENTLY. MAINT SAID THAT A DUCT HAD COME LOOSE CAUSING A PRESSURIZATION LOSS. THE DUCT CAME LOOSE FROM THE SAME ACFT THE DAY AFTER THIS INCIDENT AND NOW MAINT IS REDESIGNING THE DUCT ATTACHMENT.

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.