Narrative:

When we arrived at the aircraft both cockpit windows were open. The captain cranked his shut and latched it, and I cranked mine shut and latched it. The remainder of preflight and taxi out were uneventful. Then on takeoff roll, with full power on the aircraft, my window popped open. Throttles were retarded at 80 KTS and automatic braking and speed brakes engaged. We exited the runway (25R) at T36 uneventfully. No assistance was required. Once clear of the runway, further examination of my window revealed that though the handle was full forward and the 'closed' sign was showing (the proper checks had been done) the actuation bar in the lower right side of the window was never over center, in the 90 degree position. So I cranked the window full aft then full forward once again and this time not only was the handle full forward and sign showing 'closed,' but the actuation rod was over center, in the 90 degree position. We were confident that this had remedied the situation. So we elected to get back in line for takeoff. The line was long enough to allow for 14 mins of brake cooling. We took off (uneventfully) and delayed gear retraction until 10000 ft MSL for further precautionary brake cooling. The remainder of the flight and subsequent landing were uneventful. The captain submitted a crew irregular operations report, but I cannot recall, at this point, whether or not we made a logbook entry of the event.

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Original NASA ASRS Text

Title: TKOF ABORTED WHEN FO'S SLIDING WINDOW OPENS PRIOR TO 80 KTS. ACFT CONFIGN PROB.

Narrative: WHEN WE ARRIVED AT THE ACFT BOTH COCKPIT WINDOWS WERE OPEN. THE CAPT CRANKED HIS SHUT AND LATCHED IT, AND I CRANKED MINE SHUT AND LATCHED IT. THE REMAINDER OF PREFLT AND TAXI OUT WERE UNEVENTFUL. THEN ON TKOF ROLL, WITH FULL PWR ON THE ACFT, MY WINDOW POPPED OPEN. THROTTLES WERE RETARDED AT 80 KTS AND AUTOMATIC BRAKING AND SPD BRAKES ENGAGED. WE EXITED THE RWY (25R) AT T36 UNEVENTFULLY. NO ASSISTANCE WAS REQUIRED. ONCE CLR OF THE RWY, FURTHER EXAMINATION OF MY WINDOW REVEALED THAT THOUGH THE HANDLE WAS FULL FORWARD AND THE 'CLOSED' SIGN WAS SHOWING (THE PROPER CHKS HAD BEEN DONE) THE ACTUATION BAR IN THE LOWER R SIDE OF THE WINDOW WAS NEVER OVER CTR, IN THE 90 DEG POS. SO I CRANKED THE WINDOW FULL AFT THEN FULL FORWARD ONCE AGAIN AND THIS TIME NOT ONLY WAS THE HANDLE FULL FORWARD AND SIGN SHOWING 'CLOSED,' BUT THE ACTUATION ROD WAS OVER CTR, IN THE 90 DEG POS. WE WERE CONFIDENT THAT THIS HAD REMEDIED THE SIT. SO WE ELECTED TO GET BACK IN LINE FOR TKOF. THE LINE WAS LONG ENOUGH TO ALLOW FOR 14 MINS OF BRAKE COOLING. WE TOOK OFF (UNEVENTFULLY) AND DELAYED GEAR RETRACTION UNTIL 10000 FT MSL FOR FURTHER PRECAUTIONARY BRAKE COOLING. THE REMAINDER OF THE FLT AND SUBSEQUENT LNDG WERE UNEVENTFUL. THE CAPT SUBMITTED A CREW IRREGULAR OPS RPT, BUT I CANNOT RECALL, AT THIS POINT, WHETHER OR NOT WE MADE A LOGBOOK ENTRY OF THE EVENT.

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.