Narrative:

On takeoff roll heavy smoke in the cockpit and cabin of the aircraft. Aborted takeoff; told flight attendants to remain seated and stopped the aircraft. Put on oxygen masks; declared an emergency; turned air conditioning packs off and had to open windows to see. After turning off the air conditioning packs smoke dissipated with the windows open. [We] had the fire trucks follow us to the gate.

Google
 

Original NASA ASRS Text

Title: A B737-900 flight crew rejected their takeoff and declared an emergency when the cockpit filled with smoke at 35 KTS during the takeoff roll.

Narrative: On takeoff roll heavy smoke in the cockpit and cabin of the aircraft. Aborted takeoff; told Flight Attendants to remain seated and stopped the aircraft. Put on oxygen masks; declared an emergency; turned air conditioning packs off and had to open windows to see. After turning off the air conditioning packs smoke dissipated with the windows open. [We] had the fire trucks follow us to the gate.

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.