A320 flight crew has a loss of cabin pressurization while en route to phl.

Attributes
ACN	594593
Time
Date	200309
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	msl bound lower : 10000 msl bound upper : 37000
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	cruise : enroute altitude change cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : flight engineer pilot : multi engine
Experience	flight time last 90 days : 150 flight time total : 20000 flight time type : 1250
ASRS Report	594593
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 200 flight time total : 20000 flight time type : 2500
ASRS Report	594590
Events
Anomaly	aircraft equipment problem : critical altitude deviation : excursion from assigned altitude other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : cabin alt ecam warning other flight crewa other flight crewb
Resolutory Action	controller : provided flight assist flight crew : overcame equipment problem flight crew : declared emergency
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

During cruise at FL370 (en route phl, departed den) autoplt on, first officer flying. Pressurization #1 system failed. Automatic switch to pressurization #2 system which failed within 1 min or so. Manual system unable to maintain required pressure. Captain assumed control, began emergency descent after clearing with ZAU. Both crew members donned oxygen masks, accomplished checklist and began descent to 10000 ft. At 22000 ft, captain gave airplane to first officer while captain briefed flight attendants and contacted company dispatcher. Aircraft leveled at 10000 ft. Maximum cabin altitude attained approximately 11700 ft. No mask deployed in cabin. Flight attendants used walkaround oxygen bottles. After conferring with company dispatch regarding fuel and WX, it was determined we could go on to original destination -- phl. All crew members agreed. All passenger were okay, no medical or abnormal sits in cabin. Flight remained at 10000 ft and flew on to phl. WX clear and smooth ride. Landed phl 5000 pounds fuel, well above required. Maintenance advised of pressurization failure. No other abnormalities occurred during flight.

Original NASA ASRS Text

Title: A320 FLT CREW HAS A LOSS OF CABIN PRESSURIZATION WHILE ENRTE TO PHL.

Narrative: DURING CRUISE AT FL370 (ENRTE PHL, DEPARTED DEN) AUTOPLT ON, FO FLYING. PRESSURIZATION #1 SYS FAILED. AUTOMATIC SWITCH TO PRESSURIZATION #2 SYS WHICH FAILED WITHIN 1 MIN OR SO. MANUAL SYS UNABLE TO MAINTAIN REQUIRED PRESSURE. CAPT ASSUMED CTL, BEGAN EMER DSCNT AFTER CLRING WITH ZAU. BOTH CREW MEMBERS DONNED OXYGEN MASKS, ACCOMPLISHED CHKLIST AND BEGAN DSCNT TO 10000 FT. AT 22000 FT, CAPT GAVE AIRPLANE TO FO WHILE CAPT BRIEFED FLT ATTENDANTS AND CONTACTED COMPANY DISPATCHER. ACFT LEVELED AT 10000 FT. MAX CABIN ALT ATTAINED APPROX 11700 FT. NO MASK DEPLOYED IN CABIN. FLT ATTENDANTS USED WALKAROUND OXYGEN BOTTLES. AFTER CONFERRING WITH COMPANY DISPATCH REGARDING FUEL AND WX, IT WAS DETERMINED WE COULD GO ON TO ORIGINAL DEST -- PHL. ALL CREW MEMBERS AGREED. ALL PAX WERE OKAY, NO MEDICAL OR ABNORMAL SITS IN CABIN. FLT REMAINED AT 10000 FT AND FLEW ON TO PHL. WX CLR AND SMOOTH RIDE. LANDED PHL 5000 LBS FUEL, WELL ABOVE REQUIRED. MAINT ADVISED OF PRESSURIZATION FAILURE. NO OTHER ABNORMALITIES OCCURRED DURING FLT.

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.