Narrative:

Ground evacuate/evacuation at gate. Found #2 air conditioning pack on at gate with both pack switches off. Maintenance pulled both pack fan circuit breakers and left the cockpit. Aircraft filled with smoke. Passenger were evacuate/evacuationed through the forward entry door. Crew turned APU and gasper off, smoke stopped.

Google
 

Original NASA ASRS Text

Title: FLC OF AN LGT EVACED THE ACFT AT THE GATE DUE TO SMOKE IN THE CABIN FROM THE AIR CONDITIONING SYS.

Narrative: GND EVAC AT GATE. FOUND #2 AIR CONDITIONING PACK ON AT GATE WITH BOTH PACK SWITCHES OFF. MAINT PULLED BOTH PACK FAN CIRCUIT BREAKERS AND LEFT THE COCKPIT. ACFT FILLED WITH SMOKE. PAX WERE EVACED THROUGH THE FORWARD ENTRY DOOR. CREW TURNED APU AND GASPER OFF, SMOKE STOPPED.

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.