Emergency declared with an emergency descent executed after loss of cabin pressure control.

Attributes
ACN	182079
Time
Date	199106
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : sny
State Reference	NE
Altitude	msl bound lower : 32500 msl bound upper : 33000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv tower : roa
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : intermediate altitude other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 200 flight time total : 6050 flight time type : 3270
ASRS Report	182079
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp
Experience	flight time last 90 days : 175 flight time total : 13500 flight time type : 175
ASRS Report	181955
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : exited adverse environment flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Climbing through 32500' leveling at 33000' the cabin rapidly went from 5500' to 10000' with altitude horn sounding. We started aircraft in a rapid descent from 33000 to 10000', doing checklist on way down. Passenger or deployed at cabin altitude 13000'. No action would hold cabin. At 10000' the pressurization did descend to 5500' and worked fine to landing at den. Callback conversation with reporter revealed the following: first officer reporter was contacted and added that O2 masks were donned by the flight crew, although the captain showed some signs of being slow to don his in an act of disbelief of the situation. When queried, the first officer stated that he felt that the 1 yr so could have caught the cabin or reported it sooner than he did as he had been watching it in its climb from 8000' up to the 10000' level where the horn sounded. The aft was on its second leg after being accepted from a contract maintenance base operated by another large air carrier. Aircraft was later ferried to overhaul for aircraft check. This was first officer's second loss of cabin pressure that month.

Original NASA ASRS Text

Title: EMERGENCY DECLARED WITH AN EMERGENCY DESCENT EXECUTED AFTER LOSS OF CABIN PRESSURE CTL.

Narrative: CLBING THROUGH 32500' LEVELING AT 33000' THE CABIN RAPIDLY WENT FROM 5500' TO 10000' WITH ALT HORN SOUNDING. WE STARTED ACFT IN A RAPID DSNT FROM 33000 TO 10000', DOING CHKLIST ON WAY DOWN. PAX OR DEPLOYED AT CABIN ALT 13000'. NO ACTION WOULD HOLD CABIN. AT 10000' THE PRESSURIZATION DID DSND TO 5500' AND WORKED FINE TO LNDG AT DEN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING: F/O RPTR WAS CONTACTED AND ADDED THAT O2 MASKS WERE DONNED BY THE FLT CREW, ALTHOUGH THE CAPT SHOWED SOME SIGNS OF BEING SLOW TO DON HIS IN AN ACT OF DISBELIEF OF THE SITUATION. WHEN QUERIED, THE F/O STATED THAT HE FELT THAT THE 1 YR SO COULD HAVE CAUGHT THE CABIN OR RPTED IT SOONER THAN HE DID AS HE HAD BEEN WATCHING IT IN ITS CLB FROM 8000' UP TO THE 10000' LEVEL WHERE THE HORN SOUNDED. THE AFT WAS ON ITS SECOND LEG AFTER BEING ACCEPTED FROM A CONTRACT MAINT BASE OPERATED BY ANOTHER LARGE ACR. ACFT WAS LATER FERRIED TO OVERHAUL FOR ACFT CHK. THIS WAS F/O'S SECOND LOSS OF CABIN PRESSURE THAT MONTH.

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.