Narrative:

On an air carrier flight from ind to msp, on mar/sat/95, we experienced a partial loss of cabin pressure, while climbing through FL325. The cabin altitude climbed to 11500 ft. The PNF declared an emergency, and started a rapid descent in accordance with emergency procedures. We descended the aircraft to 10000 ft. The cabin altitude stabilized at 7400 ft and we continued to msp at 10000 ft without further incident. Callback conversation with reporter revealed the following information. The reporter states that the PNF declared an emergency and an immediate descent was initiated, in order to keep the cabin from climbing any further. The flight deck crew donned oxygen masks on a 727-200 when a fairly rapid cabin rate of climb was noted -- beginning with 6500 ft to 11500 ft. After landing, the so heard from the mechanic that the problem was probably related to an outflow valves failure to close. The reporter states that the flight was given emergency priority with chicago, but that minnepolis was unaware of their having declared an emergency. The aurthority was actually exercised a second time, to preserve minimum alternate fuel. A written report was not requested by the administrator.

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Original NASA ASRS Text

Title: WHILE CLBING THROUGH FL350, AN ACR EXPERIENCED A LOSS OF PRESSURIZATION WHICH NECESSITATED AN EMER DECLARATION, AND A RAPID DSCNT.

Narrative: ON AN ACR FLT FROM IND TO MSP, ON MAR/SAT/95, WE EXPERIENCED A PARTIAL LOSS OF CABIN PRESSURE, WHILE CLBING THROUGH FL325. THE CABIN ALT CLBED TO 11500 FT. THE PNF DECLARED AN EMER, AND STARTED A RAPID DSCNT IN ACCORDANCE WITH EMER PROCS. WE DSNDED THE ACFT TO 10000 FT. THE CABIN ALT STABILIZED AT 7400 FT AND WE CONTINUED TO MSP AT 10000 FT WITHOUT FURTHER INCIDENT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO. THE RPTR STATES THAT THE PNF DECLARED AN EMER AND AN IMMEDIATE DSCNT WAS INITIATED, IN ORDER TO KEEP THE CABIN FROM CLBING ANY FURTHER. THE FLT DECK CREW DONNED OXYGEN MASKS ON A 727-200 WHEN A FAIRLY RAPID CABIN RATE OF CLB WAS NOTED -- BEGINNING WITH 6500 FT TO 11500 FT. AFTER LNDG, THE SO HEARD FROM THE MECH THAT THE PROBLEM WAS PROBABLY RELATED TO AN OUTFLOW VALVES FAILURE TO CLOSE. THE RPTR STATES THAT THE FLT WAS GIVEN EMER PRIORITY WITH CHICAGO, BUT THAT MINNEPOLIS WAS UNAWARE OF THEIR HAVING DECLARED AN EMER. THE AURTHORITY WAS ACTUALLY EXERCISED A SECOND TIME, TO PRESERVE MINIMUM ALTERNATE FUEL. A WRITTEN RPT WAS NOT REQUESTED BY THE ADMINISTRATOR.

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.