Narrative:

During climb out from FL180 to FL190, received a 'cabin altitude' caution message. After this occurred, we requested an immediate descent to 10000 ft from ATC. ATC advised us that this was approved and cleared us to 10000 ft. Within seconds of beginning descent, we received a 'cabin altitude' warning message with a 'cabin pressure' aural message. My first officer and I executed memory items and appropriate QRH procedures. After stabilizing at 10000 ft and completing all checklists, we used this time to talk to the flight attendant. She notified us that all passenger were fine and never noticed anything unusual. She also stated that she was fine and noticed nothing unusual as well. Since no structural damage was suspected, we opted not to declare an emergency. We were approximately 20 mins outside cvg, we opted to continue to cvg. Since all passenger reported no problems, we opted not to deploy masks in order not to frighten the passenger. We never exceeded 12000 ft cabin altitude even at our highest altitude of FL180. When level at 10000 ft, we attempted to reset our right pack (acm) which had fallen off-line. Our left pack (acm) was deferred at the time per maintenance control. The right pack would not reset. Maintenance was notified en route. The passenger were spoken to twice about our situation. We landed with no further occurrence.

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Original NASA ASRS Text

Title: CL65 CREW MADE A RAPID DSCNT TO 10000 FT AFTER THEY WERE DEFERRED WITH THE L PACK MEL'ED INOP AND THE R PACK TRIPPED OFF.

Narrative: DURING CLBOUT FROM FL180 TO FL190, RECEIVED A 'CABIN ALT' CAUTION MESSAGE. AFTER THIS OCCURRED, WE REQUESTED AN IMMEDIATE DSCNT TO 10000 FT FROM ATC. ATC ADVISED US THAT THIS WAS APPROVED AND CLRED US TO 10000 FT. WITHIN SECONDS OF BEGINNING DSCNT, WE RECEIVED A 'CABIN ALT' WARNING MESSAGE WITH A 'CABIN PRESSURE' AURAL MESSAGE. MY FO AND I EXECUTED MEMORY ITEMS AND APPROPRIATE QRH PROCS. AFTER STABILIZING AT 10000 FT AND COMPLETING ALL CHKLISTS, WE USED THIS TIME TO TALK TO THE FLT ATTENDANT. SHE NOTIFIED US THAT ALL PAX WERE FINE AND NEVER NOTICED ANYTHING UNUSUAL. SHE ALSO STATED THAT SHE WAS FINE AND NOTICED NOTHING UNUSUAL AS WELL. SINCE NO STRUCTURAL DAMAGE WAS SUSPECTED, WE OPTED NOT TO DECLARE AN EMER. WE WERE APPROX 20 MINS OUTSIDE CVG, WE OPTED TO CONTINUE TO CVG. SINCE ALL PAX RPTED NO PROBS, WE OPTED NOT TO DEPLOY MASKS IN ORDER NOT TO FRIGHTEN THE PAX. WE NEVER EXCEEDED 12000 FT CABIN ALT EVEN AT OUR HIGHEST ALT OF FL180. WHEN LEVEL AT 10000 FT, WE ATTEMPTED TO RESET OUR R PACK (ACM) WHICH HAD FALLEN OFF-LINE. OUR L PACK (ACM) WAS DEFERRED AT THE TIME PER MAINT CTL. THE R PACK WOULD NOT RESET. MAINT WAS NOTIFIED ENRTE. THE PAX WERE SPOKEN TO TWICE ABOUT OUR SIT. WE LANDED WITH NO FURTHER OCCURRENCE.

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.