Aircraft equipment problem pressurization.

Attributes
ACN	314646
Time
Date	199508
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : pxv
State Reference	IN
Altitude	msl bound lower : 25000 msl bound upper : 41000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zme
Operator	general aviation : corporate
Make Model Name	Gates Learjet Corp Undifferentiated or Other Model
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Route In Use	enroute other
Flight Plan	IFR
Person 1
Affiliation	Other
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	314646
Person 2
Affiliation	Other
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : less severe
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

While climbing from FL410 to FL450, I noticed cabin altitude was climbing more rapidly than normal. I requested normal descent to FL250. I manually adjusted cabin with manual pressurization and returned to automatic pressurization mode with normal results. I requested climb to FL410 and completed flight with no reoccurrences of pressurization problem.

Original NASA ASRS Text

Title: ACFT EQUIP PROB PRESSURIZATION.

Narrative: WHILE CLBING FROM FL410 TO FL450, I NOTICED CABIN ALT WAS CLBING MORE RAPIDLY THAN NORMAL. I REQUESTED NORMAL DSCNT TO FL250. I MANUALLY ADJUSTED CABIN WITH MANUAL PRESSURIZATION AND RETURNED TO AUTOMATIC PRESSURIZATION MODE WITH NORMAL RESULTS. I REQUESTED CLB TO FL410 AND COMPLETED FLT WITH NO REOCCURRENCES OF PRESSURIZATION PROB.

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.