Flight crew of an MD80 (super 80) declared an emergency for descent and diverted to land after the cabin pressurization failed to maintain cabin pressure.

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Attributes
ACN	368892
Time
Date	199705
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : irw airport : okc
State Reference	OK
Altitude	msl bound lower : 24000 msl bound upper : 24000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zfw tower : fnt
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Navigation In Use	Other
Flight Phase	cruise other other other
Route In Use	enroute airway : zfw
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	368892
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
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 other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

10 mins after exiting icing and turning the wing and engine anti-ice off the cabin flow light illuminated with a 300 to 1000 FPM climb. Followed procedure in book but no help. All engine and pack operation was normal (EPR 1.60 packs 30 psi each, xfeed manifold 40 psi). Advancing power to maximum cruise did not help. Switching controllers did not help. Declared emergency to obtain lower altitude. Pressurization was normal at 10000 ft MSL. Landed at okc.

Original NASA ASRS Text

Title: FLC OF AN MD80 (SUPER 80) DECLARED AN EMER FOR DSCNT AND DIVERTED TO LAND AFTER THE CABIN PRESSURIZATION FAILED TO MAINTAIN CABIN PRESSURE.

Narrative: 10 MINS AFTER EXITING ICING AND TURNING THE WING AND ENG ANTI-ICE OFF THE CABIN FLOW LIGHT ILLUMINATED WITH A 300 TO 1000 FPM CLB. FOLLOWED PROC IN BOOK BUT NO HELP. ALL ENG AND PACK OP WAS NORMAL (EPR 1.60 PACKS 30 PSI EACH, XFEED MANIFOLD 40 PSI). ADVANCING PWR TO MAX CRUISE DID NOT HELP. SWITCHING CTLRS DID NOT HELP. DECLARED EMER TO OBTAIN LOWER ALT. PRESSURIZATION WAS NORMAL AT 10000 FT MSL. LANDED AT OKC.

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.