A CL65 flight crew initiated an emergency descent after the cabin pressure exceeded 10000 ft while c...

Attributes
ACN	615325
Time
Date	200404
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : orl.vortac
State Reference	FL
Altitude	msl single value : 11500
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zma.artcc
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 4700 flight time type : 3700
ASRS Report	615325
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	other flight crewa
Resolutory Action	flight crew : exited adverse environment flight crew : took evasive action
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

Departing mco, we noticed an unusually high rate of cabin pressurization. Contacted maintenance regarding this situation. While talking to maintenance we got a cabin altitude caution message then within a couple seconds a cabin altitude warning, this was at about 11500 ft. We got clearance from ZMA to 10000 ft. Start emergency descent and requested to return to mco (our departure airport). No emergency declared. Ran the appropriate QRH checklist. Notified company, flight attendant and passenger about our return. Landed without further incidents. (Landed unpressurized.)

Original NASA ASRS Text

Title: A CL65 FLT CREW INITIATED AN EMER DSCNT AFTER THE CABIN PRESSURE EXCEEDED 10000 FT WHILE CLBING OUT OF MCO.

Narrative: DEPARTING MCO, WE NOTICED AN UNUSUALLY HIGH RATE OF CABIN PRESSURIZATION. CONTACTED MAINT REGARDING THIS SIT. WHILE TALKING TO MAINT WE GOT A CABIN ALT CAUTION MESSAGE THEN WITHIN A COUPLE SECONDS A CABIN ALT WARNING, THIS WAS AT ABOUT 11500 FT. WE GOT CLRNC FROM ZMA TO 10000 FT. START EMER DSCNT AND REQUESTED TO RETURN TO MCO (OUR DEP ARPT). NO EMER DECLARED. RAN THE APPROPRIATE QRH CHKLIST. NOTIFIED COMPANY, FLT ATTENDANT AND PAX ABOUT OUR RETURN. LANDED WITHOUT FURTHER INCIDENTS. (LANDED UNPRESSURIZED.)

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.

A CL65 flight crew initiated an emergency descent after the cabin pressure exceeded 10000 ft while climbing out of mco.