Narrative:

Takeoff was aborted at 115 KTS, because the first officer's window opened abruptly, almost violently. It slid back on the RAIL to the fully opened position, and the movement ripped the first officer's headset off of his head. I initiated the abort at 115 KTS. The aircraft weighed about 158000 pounds. We were doing a bleeds off, runway 26R takeoff. WX was VFR, runway was dry. I released the automatic brakes almost immediately and used full reverser on both engines. We taxied to the departure end and calculated brake cool down period. The result was a wag at best, since rejected takeoff autobrakes were used for only a few seconds and then light manual braking thereafter. After sitting for 30 mins without setting the parking brakes, I started to move the aircraft. At this point, there was a very definitive grabbing or sticking of the brakes that made the first officer and I both very uncomfortable about continuing. We then taxied back to the gate and had the brakes and tires checked by maintenance. The brakes were hot and the tire pressure was high. After about an additional hour of cooling, we departed without incident. As far as the window goes, I watched the first officer check the window closed during the preflight checks, and it appeared closed and locked as much as all the other windows I've watched first officer's close. A mechanic checked it while the brakes were cooling, and found nothing wrong. Before aborting, I did consider continuing and trying to close the window in the air, but the noise and confusion level was so high that aborting seemed the prudent option.

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Original NASA ASRS Text

Title: B737 FLC HAS SLIDING COCKPIT SIDE WINDOW OPEN DURING TKOF ROLL. TKOF ABORTED.

Narrative: TKOF WAS ABORTED AT 115 KTS, BECAUSE THE FO'S WINDOW OPENED ABRUPTLY, ALMOST VIOLENTLY. IT SLID BACK ON THE RAIL TO THE FULLY OPENED POS, AND THE MOVEMENT RIPPED THE FO'S HEADSET OFF OF HIS HEAD. I INITIATED THE ABORT AT 115 KTS. THE ACFT WEIGHED ABOUT 158000 LBS. WE WERE DOING A BLEEDS OFF, RWY 26R TKOF. WX WAS VFR, RWY WAS DRY. I RELEASED THE AUTO BRAKES ALMOST IMMEDIATELY AND USED FULL REVERSER ON BOTH ENGS. WE TAXIED TO THE DEP END AND CALCULATED BRAKE COOL DOWN PERIOD. THE RESULT WAS A WAG AT BEST, SINCE REJECTED TKOF AUTOBRAKES WERE USED FOR ONLY A FEW SECONDS AND THEN LIGHT MANUAL BRAKING THEREAFTER. AFTER SITTING FOR 30 MINS WITHOUT SETTING THE PARKING BRAKES, I STARTED TO MOVE THE ACFT. AT THIS POINT, THERE WAS A VERY DEFINITIVE GRABBING OR STICKING OF THE BRAKES THAT MADE THE FO AND I BOTH VERY UNCOMFORTABLE ABOUT CONTINUING. WE THEN TAXIED BACK TO THE GATE AND HAD THE BRAKES AND TIRES CHKED BY MAINT. THE BRAKES WERE HOT AND THE TIRE PRESSURE WAS HIGH. AFTER ABOUT AN ADDITIONAL HR OF COOLING, WE DEPARTED WITHOUT INCIDENT. AS FAR AS THE WINDOW GOES, I WATCHED THE FO CHK THE WINDOW CLOSED DURING THE PREFLT CHKS, AND IT APPEARED CLOSED AND LOCKED AS MUCH AS ALL THE OTHER WINDOWS I'VE WATCHED FO'S CLOSE. A MECH CHKED IT WHILE THE BRAKES WERE COOLING, AND FOUND NOTHING WRONG. BEFORE ABORTING, I DID CONSIDER CONTINUING AND TRYING TO CLOSE THE WINDOW IN THE AIR, BUT THE NOISE AND CONFUSION LEVEL WAS SO HIGH THAT ABORTING SEEMED THE PRUDENT OPTION.

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.