An medium large transport air carrier had a slow loss of cabin pressurization. They proceeded to their destination at 10000 ft MSL.

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Attributes
ACN	218212
Time
Date	199208
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : flm airport : ind
State Reference	KY
Altitude	msl bound lower : 10000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zid
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 descent other
Route In Use	enroute airway : zid
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 180 flight time total : 11000 flight time type : 5000
ASRS Report	218212
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 11000 flight time type : 2820
ASRS Report	218919
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	controller : issued new clearance flight crew : declared emergency flight crew : overcame equipment problem
Consequence	faa : investigated
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

At cruise altitude (31000 ft) altitude warning horn sounded. Switched to standby control, cabin continued to slowly climb, requested lower from ATC and descended to 10000 ft. Also tried manual AC and dc, cabin still climbed. Checked with flight attendants. All passenger normal. Passenger oxygen mask did not deploy. Continued to destination (ind). Supplemental information from acn 218919: could not stop the cabin from climbing in automatic, standby, or manual control. At 10000 ft had limited control of cabin. Callback conversation with reporter revealed the following information: a callback to the first officer did not produce much new information. The crew did not have to declare an emergency and did not get any real 'special handling' from ATC. The outbound trip was delayed 3 hours, then cancelled because maintenance was unable to find the pressurization problem quickly. The reporting first officer thought that it may have been the outflow valve. An FAA representative interviewed the aircrew as he had heard that the oxygen masks were deployed.

Original NASA ASRS Text

Title: AN MLG ACR HAD A SLOW LOSS OF CABIN PRESSURIZATION. THEY PROCEEDED TO THEIR DEST AT 10000 FT MSL.

Narrative: AT CRUISE ALT (31000 FT) ALT WARNING HORN SOUNDED. SWITCHED TO STANDBY CTL, CABIN CONTINUED TO SLOWLY CLB, REQUESTED LOWER FROM ATC AND DSNDED TO 10000 FT. ALSO TRIED MANUAL AC AND DC, CABIN STILL CLBED. CHKED WITH FLT ATTENDANTS. ALL PAX NORMAL. PAX OXYGEN MASK DID NOT DEPLOY. CONTINUED TO DEST (IND). SUPPLEMENTAL INFO FROM ACN 218919: COULD NOT STOP THE CABIN FROM CLBING IN AUTO, STANDBY, OR MANUAL CTL. AT 10000 FT HAD LIMITED CTL OF CABIN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: A CALLBACK TO THE FO DID NOT PRODUCE MUCH NEW INFO. THE CREW DID NOT HAVE TO DECLARE AN EMER AND DID NOT GET ANY REAL 'SPECIAL HANDLING' FROM ATC. THE OUTBOUND TRIP WAS DELAYED 3 HRS, THEN CANCELLED BECAUSE MAINT WAS UNABLE TO FIND THE PRESSURIZATION PROBLEM QUICKLY. THE RPTING FO THOUGHT THAT IT MAY HAVE BEEN THE OUTFLOW VALVE. AN FAA REPRESENTATIVE INTERVIEWED THE AIRCREW AS HE HAD HEARD THAT THE OXYGEN MASKS WERE DEPLOYED.

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.