Narrative:

On departure we had an aft cargo door light illuminate. We also noticed that the airplane did not pressurize. I declared an emergency and landed.

Google
 

Original NASA ASRS Text

Title: A MD80's aft cargo door open light illuminated immediately after becoming airborne. Since the aircraft was not pressurizing an emergency was declared and the aircraft returned to the departure airport.

Narrative: On departure we had an aft cargo door light illuminate. We also noticed that the airplane did not pressurize. I declared an emergency and landed.

Data retrieved from NASA's ASRS site as of April 2012 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.