Air carrier medium large transport put into an emergency descent after it is apparent that the rate of climb in the cabin is not under control. Loss of cabin pressure.

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Attributes
ACN	149055
Time
Date	199006
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : lbf
State Reference	NE
Altitude	msl bound lower : 10000 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 246 flight time total : 12371 flight time type : 2850
ASRS Report	149055
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer pilot : commercial pilot : cfi
Experience	flight time last 90 days : 255 flight time total : 12000 flight time type : 1100
ASRS Report	149053
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : exited adverse environment flight crew : declared emergency other other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Loss of cabin pressure at 33000'. Descended to 10000' and returned to den at that altitude. Followed normal procedures. The cabin just started to climb at a rate of 1500 FPM, which is maximum rate. Could not control via automatic press or manual means. Crew did outstanding job.

Original NASA ASRS Text

Title: ACR MLG PUT INTO AN EMERGENCY DESCENT AFTER IT IS APPARENT THAT THE RATE OF CLIMB IN THE CABIN IS NOT UNDER CONTROL. LOSS OF CABIN PRESSURE.

Narrative: LOSS OF CABIN PRESSURE AT 33000'. DSNDED TO 10000' AND RETURNED TO DEN AT THAT ALT. FOLLOWED NORMAL PROCS. THE CABIN JUST STARTED TO CLB AT A RATE OF 1500 FPM, WHICH IS MAX RATE. COULD NOT CTL VIA AUTO PRESS OR MANUAL MEANS. CREW DID OUTSTANDING JOB.

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.