An MD80 crew experienced a loss of cabin attendant pressure during cruise at FL350.

Attributes
ACN	531862
Time
Date	200112
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	navaid : tay.vortac
State Reference	FL
Altitude	msl single value : 35000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zjx.artcc
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 vortac
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	controller military : 8 controller radar : 19 flight time last 90 days : 100 flight time total : 16000 flight time type : 6000
ASRS Report	531862
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 12700 flight time type : 1800
ASRS Report	532037
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : cabin flew light cab alt other flight crewa other flight crewb
Resolutory Action	controller : provided flight assist controller : issued new clearance flight crew : overcame equipment problem
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

At cruise altitude, first officer noticed a cabin attendant 'flow' light and earlier altitude climbing at 300 to 500 FPM. We requested a lower altitude and were immediately cleared to FL240. Descent was made with cruise power and speed brakes. After going thru checklist, cabin attendant could not be controled and was rising near 10000 ft. We then requested and were cleared to 10000 ft MSL. Descending thru FL240, the cabin attendant altitude became controllable and we were able to lower it. We continued descent to 10000 ft as a precaution. Checked with flight attendants and they and the passenger noticed anything unusual. We continued to our destination rsw at 10000 ft, since we were tankering fuel and had plenty for the flight.

Original NASA ASRS Text

Title: AN MD80 CREW EXPERIENCED A LOSS OF CAB PRESSURE DURING CRUISE AT FL350.

Narrative: AT CRUISE ALT, FO NOTICED A CAB 'FLOW' LIGHT AND EARLIER ALT CLBING AT 300 TO 500 FPM. WE REQUESTED A LOWER ALT AND WERE IMMEDIATELY CLRED TO FL240. DSCNT WAS MADE WITH CRUISE PWR AND SPD BRAKES. AFTER GOING THRU CHECKLIST, CAB COULD NOT BE CTLED AND WAS RISING NEAR 10000 FT. WE THEN REQUESTED AND WERE CLRED TO 10000 FT MSL. DSNDING THRU FL240, THE CAB ALT BECAME CONTROLLABLE AND WE WERE ABLE TO LOWER IT. WE CONTINUED DSCNT TO 10000 FT AS A PRECAUTION. CHECKED WITH FLT ATTENDANTS AND THEY AND THE PAX NOTICED ANYTHING UNUSUAL. WE CONTINUED TO OUR DEST RSW AT 10000 FT, SINCE WE WERE TANKERING FUEL AND HAD PLENTY FOR THE FLT.

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.