Narrative:

Just after departure at iah, cabin altitude started rising at approximately 1500 FPM. Second officer could not get control of cabin. We climbed out at 1000 FPM to 9000'. Aircraft was unpressurized at approximately 2000' MSL. All door warning lights were checked and were out. Flight was conducted to aus in a safe manner. Descent was made at 300-500 FPM. Approximately 1/2 way through the flight the equipment access door warning light illuminated. When checked on the ground in aus, access door was closed but appeared not seated. Suspect pressurization controller or outflow valve.

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Original NASA ASRS Text

Title: ACR LGT EXPERIENCES PRESSURIZATION PROBLEMS.

Narrative: JUST AFTER DEP AT IAH, CABIN ALT STARTED RISING AT APPROX 1500 FPM. S/O COULD NOT GET CTL OF CABIN. WE CLBED OUT AT 1000 FPM TO 9000'. ACFT WAS UNPRESSURIZED AT APPROX 2000' MSL. ALL DOOR WARNING LIGHTS WERE CHKED AND WERE OUT. FLT WAS CONDUCTED TO AUS IN A SAFE MANNER. DSNT WAS MADE AT 300-500 FPM. APPROX 1/2 WAY THROUGH THE FLT THE EQUIP ACCESS DOOR WARNING LIGHT ILLUMINATED. WHEN CHKED ON THE GND IN AUS, ACCESS DOOR WAS CLOSED BUT APPEARED NOT SEATED. SUSPECT PRESSURIZATION CTLR OR OUTFLOW VALVE.

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.