MD80 flight crew has loss of pressurization while in cruise at FL350. They declare an emergency and ...

Attributes
ACN	686105
Time
Date	200502
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : zzz.vor
State Reference	US
Altitude	msl single value : 35000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.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
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	686105
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : pressurization warning other flight crewa
Resolutory Action	controller : provided flight assist flight crew : declared emergency flight crew : overcame equipment problem
Consequence	other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

In cruise at FL350. In clouds with all anti-ice on and functioning. Pressurization flow light came on. Noticed left pack with no flow and cabin climbing at 500 FPM. Advised ATC we needed lower 'now.' received clearance to FL310. Pulled out QRH; then noticed that other pack flow had dropped to nothing. Advised we needed lower; then declared an emergency and advised we were descending to 15000 ft. Cabin reached as high as 9000 ft. About FL250 packs resumed operation. We leveled at FL220 and terminated emergency status. Continued to destination at FL230. Maintenance replaced water separator bags that were very wet that they believed might have frozen.

Original NASA ASRS Text

Title: MD80 FLT CREW HAS LOSS OF PRESSURIZATION WHILE IN CRUISE AT FL350. THEY DECLARE AN EMER AND DSCNT.

Narrative: IN CRUISE AT FL350. IN CLOUDS WITH ALL ANTI-ICE ON AND FUNCTIONING. PRESSURIZATION FLOW LIGHT CAME ON. NOTICED L PACK WITH NO FLOW AND CABIN CLBING AT 500 FPM. ADVISED ATC WE NEEDED LOWER 'NOW.' RECEIVED CLRNC TO FL310. PULLED OUT QRH; THEN NOTICED THAT OTHER PACK FLOW HAD DROPPED TO NOTHING. ADVISED WE NEEDED LOWER; THEN DECLARED AN EMER AND ADVISED WE WERE DSNDING TO 15000 FT. CABIN REACHED AS HIGH AS 9000 FT. ABOUT FL250 PACKS RESUMED OP. WE LEVELED AT FL220 AND TERMINATED EMER STATUS. CONTINUED TO DEST AT FL230. MAINT REPLACED WATER SEPARATOR BAGS THAT WERE VERY WET THAT THEY BELIEVED MIGHT HAVE FROZEN.

Data retrieved from NASA's ASRS site as of January 2009 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.

MD80 flight crew has loss of pressurization while in cruise at FL350. They declare an emergency and descent.