Aircraft pressurization system malfunction.

Attributes
ACN	131358
Time
Date	198912
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : oak
State Reference	CA
Altitude	msl bound lower : 29000 msl bound upper : 35000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zoa
Operator	common carrier : air carrier
Make Model Name	Heavy Transport, Low Wing, 4 Turbojet Eng
Navigation In Use	Other
Flight Phase	cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 11000 flight time type : 5000
ASRS Report	131358
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

Cabin had slow climb at 35000', could not stop cabin climb. Advised ATC and received clearance to lower altitude. Cabin pressure ok at 29000'. Diverted to lax maintenance base for repairs operation normal below 29000' normal landing.

Original NASA ASRS Text

Title: ACFT PRESSURIZATION SYSTEM MALFUNCTION.

Narrative: CABIN HAD SLOW CLB AT 35000', COULD NOT STOP CABIN CLB. ADVISED ATC AND RECEIVED CLRNC TO LOWER ALT. CABIN PRESSURE OK AT 29000'. DIVERTED TO LAX MAINT BASE FOR REPAIRS OPERATION NORMAL BELOW 29000' NORMAL LNDG.

Data retrieved from NASA's ASRS site as of August 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.