Air carrier large transport lost of cabin pressurization at cruise altitude of FL350. Emergency declared and descent begun. Cabin pressure control recovered at FL270.

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Attributes
ACN	143505
Time
Date	199004
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : emi
State Reference	MD
Altitude	msl bound lower : 24000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	cruise other descent other
Route In Use	enroute airway : j48
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : cfi pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 120 flight time total : 9000 flight time type : 2000
ASRS Report	143505
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : commercial pilot : flight engineer pilot : instrument pilot : atp
Experience	flight time last 90 days : 180 flight time total : 9000 flight time type : 2400
ASRS Report	143186
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

During cruise aircraft experienced a sudden loss of cabin pressure. Cabin started climbed at 2000 FPM and reached 9500' before the F/east was able to control it. Captain declared emergency and began descent, hoping to prevent 10000' cabin and O2 mask drop. F/east was able to stabilize cabin at FL270 and remainder of flight completed west/O further incident of FL240. This aircraft had a history of pressurization problems, including a similar incident the day before, and while maintenance had tried several different approachs to solving these sudden losses of pressure, but they continue. Company refused to take aircraft OTS until corrective action could be found.

Original NASA ASRS Text

Title: ACR LGT LOST OF CABIN PRESSURIZATION AT CRUISE ALT OF FL350. EMERGENCY DECLARED AND DESCENT BEGUN. CABIN PRESSURE CTL RECOVERED AT FL270.

Narrative: DURING CRUISE ACFT EXPERIENCED A SUDDEN LOSS OF CABIN PRESSURE. CABIN STARTED CLIMBED AT 2000 FPM AND REACHED 9500' BEFORE THE F/E WAS ABLE TO CONTROL IT. CAPT DECLARED EMER AND BEGAN DSNT, HOPING TO PREVENT 10000' CABIN AND O2 MASK DROP. F/E WAS ABLE TO STABILIZE CABIN AT FL270 AND REMAINDER OF FLT COMPLETED W/O FURTHER INCIDENT OF FL240. THIS ACFT HAD A HISTORY OF PRESSURIZATION PROBS, INCLUDING A SIMILAR INCIDENT THE DAY BEFORE, AND WHILE MAINT HAD TRIED SEVERAL DIFFERENT APCHS TO SOLVING THESE SUDDEN LOSSES OF PRESSURE, BUT THEY CONTINUE. COMPANY REFUSED TO TAKE ACFT OTS UNTIL CORRECTIVE ACTION COULD BE FOUND.

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.