Large transport had to return land den when the cabin would not pressurize after takeoff.

Attributes
ACN	257247
Time
Date	199311
Day	Wed
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : den
State Reference	CO
Altitude	msl bound lower : 10000 msl bound upper : 10000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : den
Operator	common carrier : air carrier
Make Model Name	Large Transport, Low Wing, 3 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : second officer
Qualification	pilot : instrument pilot : commercial pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 255 flight time total : 8000 flight time type : 3863
ASRS Report	257247
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
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:

On climb out of den passing 9000 MSL, it was observed that the cabin was not pressurizing. Aircraft was leveled off at 10000 ft and all checklist procedures were followed -- cabin would not pressurize and aircraft returned to den.

Original NASA ASRS Text

Title: LGT HAD TO RETURN LAND DEN WHEN THE CABIN WOULD NOT PRESSURIZE AFTER TKOF.

Narrative: ON CLBOUT OF DEN PASSING 9000 MSL, IT WAS OBSERVED THAT THE CABIN WAS NOT PRESSURIZING. ACFT WAS LEVELED OFF AT 10000 FT AND ALL CHKLIST PROCS WERE FOLLOWED -- CABIN WOULD NOT PRESSURIZE AND ACFT RETURNED TO DEN.

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.