Narrative:

While operating aircraft as flight from ZZZ to ZZZ1 we observed a cabin altitude caution message on ED1. We had just leveled at FL210. I initiated a descent and requested lower from ATC while copilot attempted to execute the appropriate checklist. Moments later while descending through FL190 we observed the cabin altitude master warning. We declared the emergency; executed the epc and descended to 10000 ft. We performed the expanded checklist and returned to ZZZ at 8000 ft. A cell call was made to dispatch. Minimum fuel was declared and we were vectored for a visual approach to runway 1R in ZZZ. WX conditions were clear and visibility was greater than 10 mi throughout the event. No crash fire rescue equipment was required or requested. We taxied to the gate and deplaned without further incident.

Google
 

Original NASA ASRS Text

Title: CRJ-200 FLT CREW HAS A PRESSURIZATION ANOMALY; DECLARES AN EMER; DESCENDS AND DIVERTS FOR LNDG.

Narrative: WHILE OPERATING ACFT AS FLT FROM ZZZ TO ZZZ1 WE OBSERVED A CABIN ALT CAUTION MESSAGE ON ED1. WE HAD JUST LEVELED AT FL210. I INITIATED A DSCNT AND REQUESTED LOWER FROM ATC WHILE COPLT ATTEMPTED TO EXECUTE THE APPROPRIATE CHKLIST. MOMENTS LATER WHILE DSNDING THROUGH FL190 WE OBSERVED THE CABIN ALT MASTER WARNING. WE DECLARED THE EMER; EXECUTED THE EPC AND DSNDED TO 10000 FT. WE PERFORMED THE EXPANDED CHKLIST AND RETURNED TO ZZZ AT 8000 FT. A CELL CALL WAS MADE TO DISPATCH. MINIMUM FUEL WAS DECLARED AND WE WERE VECTORED FOR A VISUAL APCH TO RWY 1R IN ZZZ. WX CONDITIONS WERE CLR AND VISIBILITY WAS GREATER THAN 10 MI THROUGHOUT THE EVENT. NO CFR WAS REQUIRED OR REQUESTED. WE TAXIED TO THE GATE AND DEPLANED WITHOUT FURTHER INCIDENT.

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.