Narrative:

Captain's side window blew open during application of takeoff power at approximately 20-30 KIAS during takeoff roll. Discontinued takeoff and taxied clear of the runway to make sure window was secure. Situational description: 1) flight was an extra section flight added due to the overbooking of a previous flight. 2) maintenance was replacing the right heat exchanger on the air-conditioning system when we arrived at the aircraft. 3) aircraft had an mco for the left bleed system. High-pressure bleed valve was wired shut due to a previous malfunction. 4) interior of aircraft was very hot approximately 85 degrees. Distrs during preflight: 1) gate began to board passenger while we were conducting preflight. I stopped the preflight to tell gate agents to stop boarding the aircraft due to the extreme temperature. I went outside the aircraft to help hook-up external air-conditioning. 2) re-entered aircraft to continue preflight. Mechanics entered cockpit to sign off logbook for heat exchanger replacement. I questioned mechanics on the left high-pressure bleed mco. A 'bleed' light was still illuminated on the overhead panel. Mechanic said indication was normal. I took his word for it. 3) ran the before start checklist. Received incorrect fuel load on paperwork. Contacted dispatcher to get paperwork corrected. 4) during this entire process we were in a hurry to get the flight out so passenger could make connections. Conclusions: I believe the aircraft window had been opened and closed before we arrived at the aircraft due to the extreme heat in the cockpit. The window as closed with the handle in the correct position, but was not fully seated in the latch detent. I did not catch this on preflight, probably because of the above distrs. The check window item is also on the before-takeoff checklist. During this check I put my hand on the window handle to make sure it is in the forward position. From this point forward I will also pull on the handle to make sure it is latched in the detent. I realize I am ultimately responsible. From now on I will slow things down when I feel rushed to ensure compliance.

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Original NASA ASRS Text

Title: B767-300 CREW ABORTED TKOF AFTER THE CAPT'S SLIDING WINDOW OPENED AT THE BEGINNING OF THE TKOF ROLL.

Narrative: CAPT'S SIDE WINDOW BLEW OPEN DURING APPLICATION OF TKOF PWR AT APPROX 20-30 KIAS DURING TKOF ROLL. DISCONTINUED TKOF AND TAXIED CLR OF THE RWY TO MAKE SURE WINDOW WAS SECURE. SITUATIONAL DESCRIPTION: 1) FLT WAS AN EXTRA SECTION FLT ADDED DUE TO THE OVERBOOKING OF A PREVIOUS FLT. 2) MAINT WAS REPLACING THE R HEAT EXCHANGER ON THE AIR-CONDITIONING SYS WHEN WE ARRIVED AT THE ACFT. 3) ACFT HAD AN MCO FOR THE L BLEED SYS. HIGH-PRESSURE BLEED VALVE WAS WIRED SHUT DUE TO A PREVIOUS MALFUNCTION. 4) INTERIOR OF ACFT WAS VERY HOT APPROX 85 DEGS. DISTRS DURING PREFLT: 1) GATE BEGAN TO BOARD PAX WHILE WE WERE CONDUCTING PREFLT. I STOPPED THE PREFLT TO TELL GATE AGENTS TO STOP BOARDING THE ACFT DUE TO THE EXTREME TEMP. I WENT OUTSIDE THE ACFT TO HELP HOOK-UP EXTERNAL AIR-CONDITIONING. 2) RE-ENTERED ACFT TO CONTINUE PREFLT. MECHS ENTERED COCKPIT TO SIGN OFF LOGBOOK FOR HEAT EXCHANGER REPLACEMENT. I QUESTIONED MECHS ON THE L HIGH-PRESSURE BLEED MCO. A 'BLEED' LIGHT WAS STILL ILLUMINATED ON THE OVERHEAD PANEL. MECH SAID INDICATION WAS NORMAL. I TOOK HIS WORD FOR IT. 3) RAN THE BEFORE START CHKLIST. RECEIVED INCORRECT FUEL LOAD ON PAPERWORK. CONTACTED DISPATCHER TO GET PAPERWORK CORRECTED. 4) DURING THIS ENTIRE PROCESS WE WERE IN A HURRY TO GET THE FLT OUT SO PAX COULD MAKE CONNECTIONS. CONCLUSIONS: I BELIEVE THE ACFT WINDOW HAD BEEN OPENED AND CLOSED BEFORE WE ARRIVED AT THE ACFT DUE TO THE EXTREME HEAT IN THE COCKPIT. THE WINDOW AS CLOSED WITH THE HANDLE IN THE CORRECT POS, BUT WAS NOT FULLY SEATED IN THE LATCH DETENT. I DID NOT CATCH THIS ON PREFLT, PROBABLY BECAUSE OF THE ABOVE DISTRS. THE CHK WINDOW ITEM IS ALSO ON THE BEFORE-TKOF CHKLIST. DURING THIS CHK I PUT MY HAND ON THE WINDOW HANDLE TO MAKE SURE IT IS IN THE FORWARD POS. FROM THIS POINT FORWARD I WILL ALSO PULL ON THE HANDLE TO MAKE SURE IT IS LATCHED IN THE DETENT. I REALIZE I AM ULTIMATELY RESPONSIBLE. FROM NOW ON I WILL SLOW THINGS DOWN WHEN I FEEL RUSHED TO ENSURE COMPLIANCE.

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.