LJ60 crew had air conditioning and pressurization problem departing lzu.

Attributes
ACN	508888
Time
Date	200104
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : atl.tracon
State Reference	CA
Altitude	msl single value : 13000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : a80.tracon tower : pdx.tower
Operator	general aviation : corporate
Make Model Name	Learjet 60
Operating Under FAR Part	Part 91
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : corporate
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : cfi
Experience	flight time last 90 days : 100 flight time total : 7000 flight time type : 1000
ASRS Report	508888
Person 2
Affiliation	company : corporate
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : less severe maintenance problem : improper maintenance other anomaly other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	controller : provided flight assist controller : issued new clearance flight crew : diverted to another airport none taken : detected after the fact other
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure performance deficiency : testing performance deficiency : repair performance deficiency : fault isolation
Supplementary
Problem Areas	Maintenance Human Performance Aircraft Company
Primary Problem	Company

Narrative:

After departing lzu, we both began to discuss the higher than normal airflow associated with the pressurization system we were noticing. We leveled off at 13000 ft. All engine and pressurization parameters were normal. We called maintenance and then tried the manual mode with no noticeable change in airflow. In addition, we also cycled the bleed air switches. We returned to lzu. The aircraft has a history of pressurization problems with the most recent work being done to the aircraft at ckb where we started our rotation. (The flow control and mixing valves had been replaced.) we did not have pressurization problems on the ckb to lzu leg.

Original NASA ASRS Text

Title: LJ60 CREW HAD AIR CONDITIONING AND PRESSURIZATION PROB DEPARTING LZU.

Narrative: AFTER DEPARTING LZU, WE BOTH BEGAN TO DISCUSS THE HIGHER THAN NORMAL AIRFLOW ASSOCIATED WITH THE PRESSURIZATION SYS WE WERE NOTICING. WE LEVELED OFF AT 13000 FT. ALL ENG AND PRESSURIZATION PARAMETERS WERE NORMAL. WE CALLED MAINT AND THEN TRIED THE MANUAL MODE WITH NO NOTICEABLE CHANGE IN AIRFLOW. IN ADDITION, WE ALSO CYCLED THE BLEED AIR SWITCHES. WE RETURNED TO LZU. THE ACFT HAS A HISTORY OF PRESSURIZATION PROBS WITH THE MOST RECENT WORK BEING DONE TO THE ACFT AT CKB WHERE WE STARTED OUR ROTATION. (THE FLOW CTL AND MIXING VALVES HAD BEEN REPLACED.) WE DID NOT HAVE PRESSURIZATION PROBS ON THE CKB TO LZU LEG.

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.