Flight crew of an large transport air carrier aircraft declared an emergency due to a loss of cabin pressurization and descended until regaining cabin pressure via manual control.

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Attributes
ACN	258280
Time
Date	199312
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : dkk
State Reference	NY
Altitude	msl bound lower : 12000 msl bound upper : 31000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zny artcc : zdc
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	cruise other descent other other
Route In Use	enroute airway : znyj36
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 180 flight time total : 14000 flight time type : 700
ASRS Report	258280
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : overcame equipment problem other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Approximately 100 mi east of dunkirk VOR on J36 at FL310 in VMC, the red 'cabin altitude' warning light came on and aural warning sounded. Cabin was at 10300 ft. We informed ATC and requested lower altitude. We were initially cleared to FL280. We descended aircraft and started our emergency procedures. Cabin continued to climb. We declared an emergency and requested 12000 ft. We were given an 'off course vector' and cleared to 12000 ft. In descent, we regained control of cabin with manual controller and requested level off at FL180. We completed all checklists and determined that we could control cabin with manual controller and that it was safe to continue to ord. We completed remainder of flight with no further problems.

Original NASA ASRS Text

Title: FLC OF AN LGT ACR ACFT DECLARED AN EMER DUE TO A LOSS OF CABIN PRESSURIZATION AND DSNDED UNTIL REGAINING CABIN PRESSURE VIA MANUAL CTL.

Narrative: APPROX 100 MI E OF DUNKIRK VOR ON J36 AT FL310 IN VMC, THE RED 'CABIN ALT' WARNING LIGHT CAME ON AND AURAL WARNING SOUNDED. CABIN WAS AT 10300 FT. WE INFORMED ATC AND REQUESTED Lower ALT. WE WERE INITIALLY CLRED TO FL280. WE DSNDED ACFT AND STARTED OUR EMER PROCS. CABIN CONTINUED TO CLB. WE DECLARED AN EMER AND REQUESTED 12000 FT. WE WERE GIVEN AN 'OFF COURSE VECTOR' AND CLRED TO 12000 FT. IN DSCNT, WE REGAINED CTL OF CABIN WITH MANUAL CTLR AND REQUESTED LEVEL OFF AT FL180. WE COMPLETED ALL CHKLISTS AND DETERMINED THAT WE COULD CTL CABIN WITH MANUAL CTLR AND THAT IT WAS SAFE TO CONTINUE TO ORD. WE COMPLETED REMAINDER OF FLT WITH NO FURTHER PROBS.

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.