Flight crew of an medium large transport diverted to land after losing cabin pressure at cruise altitude, and found that it could not be held above FL250.

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Attributes
ACN	377955
Time
Date	199708
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	atc facility : stl
State Reference	MO
Altitude	msl bound lower : 33000 msl bound upper : 33000
Environment
Flight Conditions	IMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zkc
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	cruise other other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	other other : other pilot : atp
Experience	flight time last 90 days : 220 flight time total : 13300 flight time type : 580
ASRS Report	377955
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Cabin pressure exceeded 10000 ft, started descent as cabin continued climbing. Were able to control cabin again at FL250. Diverted to stl. Normal landing.

Original NASA ASRS Text

Title: FLC OF AN MLG DIVERTED TO LAND AFTER LOSING CABIN PRESSURE AT CRUISE ALT, AND FOUND THAT IT COULD NOT BE HELD ABOVE FL250.

Narrative: CABIN PRESSURE EXCEEDED 10000 FT, STARTED DSCNT AS CABIN CONTINUED CLBING. WERE ABLE TO CTL CABIN AGAIN AT FL250. DIVERTED TO STL. NORMAL LNDG.

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.