Narrative:

During takeoff roll, below 65 KTS, the copilot's sliding window opened. The takeoff was aborted and all company procedures were followed including brake cooling time. The abort was slow speed and maximum braking was not used. The copilot had opened his sliding window just before taxi out to take in a fuel slip. This method was used as the jetway had been removed from the aircraft. The window was closed and checked latched. The flight continued and was uneventful. Suggest no paperwork through the pilot's windows would keep this from happening again.

Google
 

Original NASA ASRS Text

Title: FLC OF A B737-300 ABORTED TKOF BECAUSE THE FO'S SIDE WINDOW SLID OPEN. THE WINDOW WAS CLOSED AND AN UNEVENTFUL TKOF WAS SUBSEQUENTLY MADE.

Narrative: DURING TKOF ROLL, BELOW 65 KTS, THE COPLT'S SLIDING WINDOW OPENED. THE TKOF WAS ABORTED AND ALL COMPANY PROCS WERE FOLLOWED INCLUDING BRAKE COOLING TIME. THE ABORT WAS SLOW SPD AND MAX BRAKING WAS NOT USED. THE COPLT HAD OPENED HIS SLIDING WINDOW JUST BEFORE TAXI OUT TO TAKE IN A FUEL SLIP. THIS METHOD WAS USED AS THE JETWAY HAD BEEN REMOVED FROM THE ACFT. THE WINDOW WAS CLOSED AND CHKED LATCHED. THE FLT CONTINUED AND WAS UNEVENTFUL. SUGGEST NO PAPERWORK THROUGH THE PLT'S WINDOWS WOULD KEEP THIS FROM HAPPENING AGAIN.

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.