Narrative:

During engine start a strong smell of dirty socks was smelled throughout the airplane from the cockpit all the way back to the aft galley. The flight attendants and several passengers complained about the strong odor. I cycled the packs off and the engine bleed off to see if any changes in smell. There was no change and the strong smell continued. I shut down the engines and we deplaned the passengers. I believe the smell came from burning oil; either from the APU or engines.

Google
 

Original NASA ASRS Text

Title: An A321 Captain reported a strong dirty socks smell throughout the entire aircraft which did not dissipate after turning the engine bleeds and packs OFF; so the aircraft was deplaned and the flight canceled.

Narrative: During engine start a strong smell of dirty socks was smelled throughout the airplane from the cockpit all the way back to the aft galley. The flight attendants and several passengers complained about the strong odor. I cycled the packs off and the engine bleed off to see if any changes in smell. There was no change and the strong smell continued. I shut down the engines and we deplaned the passengers. I believe the smell came from burning oil; either from the APU or engines.

Data retrieved from NASA's ASRS site as of July 2013 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.