<< >> NASA ASRS Report 332047, March 1996

Pressurization loss at altitude. Flight crew declared emergency and descended to 10000 ft, but oxygen masks deployed prior to reaching 10000 ft.

Attributes
ACN	332047
Time
Date	199603
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : clt
State Reference	SC
Altitude	msl bound lower : 10000 msl bound upper : 28000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : ztl
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	cruise other
Route In Use	enroute airway : ztl
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 220 flight time total : 14000 flight time type : 600
ASRS Report	332047
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : atp
Experience	flight time last 90 days : 200 flight time total : 9600 flight time type : 3000
ASRS Report	332231
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 none taken : unable other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

At cruise, FL280, noticed flow light and cabin altitude at approximately 8000 ft. Tried to lower cabin, unable. Asked ZTL for lower. Given FL250. Cabin still climbing above 8500 ft. Declared emergency. Emergency descent to 15000 ft, then 11000 ft, then 10000 ft. Cabin climbed to approximately 12000 ft. Mask deployed. All passenger ok. Airplane repressurized at 10000 ft. All normal, abnormal and emergency checklists failed to regain cabin prior to masks being ejected. Totally uneventful landing in clt. Cause unknown.

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Original NASA ASRS Text

Title: PRESSURIZATION LOSS AT ALT. FLC DECLARED EMER AND DSNDED TO 10000 FT, BUT OXYGEN MASKS DEPLOYED PRIOR TO REACHING 10000 FT.

Narrative: AT CRUISE, FL280, NOTICED FLOW LIGHT AND CABIN ALT AT APPROX 8000 FT. TRIED TO LOWER CABIN, UNABLE. ASKED ZTL FOR LOWER. GIVEN FL250. CABIN STILL CLBING ABOVE 8500 FT. DECLARED EMER. EMER DSCNT TO 15000 FT, THEN 11000 FT, THEN 10000 FT. CABIN CLBED TO APPROX 12000 FT. MASK DEPLOYED. ALL PAX OK. AIRPLANE REPRESSURIZED AT 10000 FT. ALL NORMAL, ABNORMAL AND EMER CHKLISTS FAILED TO REGAIN CABIN PRIOR TO MASKS BEING EJECTED. TOTALLY UNEVENTFUL LNDG IN CLT. CAUSE UNKNOWN.

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.