LJ25 flight crew suffers pressurization failure. Return to departure airport.

Attributes
ACN	761898
Time
Date	200711
Local Time Of Day	1201 To 1800
Place
Locale Reference	navaid : zzz.vor
State Reference	US
Altitude	msl single value : 34000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zzz.artcc tower : sllp.tower
Operator	general aviation : personal
Make Model Name	Learjet 25
Operating Under FAR Part	Part 91
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain
Qualification	pilot : atp
Experience	flight time last 90 days : 45 flight time total : 9000 flight time type : 8000
ASRS Report	762
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : cabin alt ind other flight crewa
Resolutory Action	flight crew : landed as precaution other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

While climbing to FL410 I noticed cabin climbing in altitude. Stopped climb with permission from ZJX. Cabin altitude was still climbing. Crew donned oxygen mask and initiated a descent to 10000 ft as a precaution with ZJX's blessing and proceeded back to tampa; fl with no special assistance with no problem. All checklist were followed to the letter.

Original NASA ASRS Text

Title: LJ25 FLT CREW SUFFERS PRESSURIZATION FAILURE. RETURN TO DEP ARPT.

Narrative: WHILE CLBING TO FL410 I NOTICED CABIN CLBING IN ALT. STOPPED CLB WITH PERMISSION FROM ZJX. CABIN ALT WAS STILL CLBING. CREW DONNED OXYGEN MASK AND INITIATED A DSCNT TO 10000 FT AS A PRECAUTION WITH ZJX'S BLESSING AND PROCEEDED BACK TO TAMPA; FL WITH NO SPECIAL ASSISTANCE WITH NO PROB. ALL CHKLIST WERE FOLLOWED TO THE LETTER.

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.