Medium large transport has pressurization problems, declare emergency, make emergency descent.

Attributes
ACN	241069
Time
Date	199305
Day	Thu
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : mke
State Reference	WI
Altitude	msl bound lower : 29500 msl bound upper : 31000
Environment
Flight Conditions	Mixed
Light	Night
Aircraft 1
Controlling Facilities	artcc : zau
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : instrument pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 18000 flight time type : 83
ASRS Report	241069
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

After engine start we received an ECAM message 'cabin pressurization system 1 fault.' we followed prescribed procedure and cleared the fault. Later, while descending from FL310 to FL290, the cabin started to climb, I asked for lower but now the cabin started climbing rapidly. I declared an emergency and made a rapid descent to 10000 ft. The masks deployed. The protective lens cover on the oxygen mask restr my view of the flight mode annunciator at first and it was a few mins before I recognized the problem and removed the cover. Since we were only a little over 100 mi from mke we continued to mke.

Original NASA ASRS Text

Title: MLG HAS PRESSURIZATION PROBS, DECLARE EMER, MAKE EMER DSCNT.

Narrative: AFTER ENG START WE RECEIVED AN ECAM MESSAGE 'CABIN PRESSURIZATION SYS 1 FAULT.' WE FOLLOWED PRESCRIBED PROC AND CLRED THE FAULT. LATER, WHILE DSNDING FROM FL310 TO FL290, THE CABIN STARTED TO CLB, I ASKED FOR LOWER BUT NOW THE CABIN STARTED CLBING RAPIDLY. I DECLARED AN EMER AND MADE A RAPID DSCNT TO 10000 FT. THE MASKS DEPLOYED. THE PROTECTIVE LENS COVER ON THE OXYGEN MASK RESTR MY VIEW OF THE FLT MODE ANNUNCIATOR AT FIRST AND IT WAS A FEW MINS BEFORE I RECOGNIZED THE PROB AND REMOVED THE COVER. SINCE WE WERE ONLY A LITTLE OVER 100 MI FROM MKE WE CONTINUED TO MKE.

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.