An emb-145 crew cruising at FL220 detected the cabin altitude climbing through 8;800 ft with no EICA...

Narrative:

In cruise flight at FL220; we observed that the cabin altitude was rapidly climbing (no associated EICAS message). When we saw it; the cabin altitude indicated 8;800 ft and climbing. The highest altitude I observed was 10;400 ft. We performed the memory items; initiated an emergency descent; contacted center. We were given clearance to descend to 10;000 ft. The captain also called the flight attendant and told her that we were in an emergency descent and to prepare the cabin.on the ground; the captain contacted maintenance control and had the pack number 2 placed on MEL because it was inoperative. We followed the procedures as we are trained and the flight landed safely without further incident.

Original NASA ASRS Text

Title: An EMB-145 crew cruising at FL220 detected the cabin altitude climbing through 8;800 FT with no EICAS messages so they declared an emergency; completed the memory items and descended to 10;000 FT. The right pack was MEL'ed inoperative after landing.

Narrative: In cruise flight at FL220; we observed that the Cabin altitude was rapidly climbing (no associated EICAS message). When we saw it; the cabin altitude indicated 8;800 FT and climbing. The highest altitude I observed was 10;400 FT. We performed the memory items; initiated an emergency descent; contacted Center. We were given clearance to descend to 10;000 FT. The Captain also called the Flight Attendant and told her that we were in an emergency descent and to prepare the cabin.On the ground; the Captain contacted Maintenance Control and had the pack number 2 placed on MEL because it was inoperative. We followed the procedures as we are trained and the flight landed safely without further incident.

Data retrieved from NASA's ASRS site 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.

Attributes
ACN	1194460
Time
Date	201408
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	EMB ERJ 145 ER/LR
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Flight Plan	IFR
Component
Aircraft Component	Air Conditioning and Pressurization Pack
Person 1
Function	First Officer Pilot Not Flying
Events
Anomaly	Aircraft Equipment Problem Critical

An emb-145 crew cruising at FL220 detected the cabin altitude climbing through 8;800 ft with no EICAS messages so they declared an emergency; completed the memory items and descended to 10;000 ft. The right pack was MEL'ed inoperative after landing.