Narrative:

Another air carrier aircraft taxied off the edge on the runway. The tower asked if we could take off from taxiway K, being that we were behind this aircraft. Our performance flight manual has temporary data for that airport, and I used this data in my performance computations. I am new at the company (2 months), and the airports I have flown into up to this point have not, or very few, needed to use temporary data. However, I was sure we were ok for takeoff because our temporary data is for airports with unusual sits, like construction to runways and txwys, therefore, the full length of certain runways would not be useable. The captain asked me if we were ok to use taxiway K, and I assured him we were. On the takeoff roll, it was my takeoff, I noticed and felt the captain adding more thrust. We rotated on speed and lifted off with approximately 1500-2000 ft remaining. While en route to our destination, we recalculated and realized that we had exceeded our takeoff weight limit for that runway from taxiway K. I have learned a very valuable lesson from this experience. Although I feel very comfortable with our performance computations, I realize that one small oversight can make a huge difference.

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Original NASA ASRS Text

Title: B737-500 FLC, UNABLE TO USE ENTIRE RWY, MAKE OVERWT TKOF FROM INTXN. MISINTERP OF TEMPORARY PERFORMANCE DATA. ERROR ADMITTED.

Narrative: ANOTHER ACR ACFT TAXIED OFF THE EDGE ON THE RWY. THE TWR ASKED IF WE COULD TAKE OFF FROM TXWY K, BEING THAT WE WERE BEHIND THIS ACFT. OUR PERFORMANCE FLT MANUAL HAS TEMPORARY DATA FOR THAT ARPT, AND I USED THIS DATA IN MY PERFORMANCE COMPUTATIONS. I AM NEW AT THE COMPANY (2 MONTHS), AND THE ARPTS I HAVE FLOWN INTO UP TO THIS POINT HAVE NOT, OR VERY FEW, NEEDED TO USE TEMPORARY DATA. HOWEVER, I WAS SURE WE WERE OK FOR TKOF BECAUSE OUR TEMPORARY DATA IS FOR ARPTS WITH UNUSUAL SITS, LIKE CONSTRUCTION TO RWYS AND TXWYS, THEREFORE, THE FULL LENGTH OF CERTAIN RWYS WOULD NOT BE USEABLE. THE CAPT ASKED ME IF WE WERE OK TO USE TXWY K, AND I ASSURED HIM WE WERE. ON THE TKOF ROLL, IT WAS MY TKOF, I NOTICED AND FELT THE CAPT ADDING MORE THRUST. WE ROTATED ON SPD AND LIFTED OFF WITH APPROX 1500-2000 FT REMAINING. WHILE ENRTE TO OUR DEST, WE RECALCULATED AND REALIZED THAT WE HAD EXCEEDED OUR TKOF WT LIMIT FOR THAT RWY FROM TXWY K. I HAVE LEARNED A VERY VALUABLE LESSON FROM THIS EXPERIENCE. ALTHOUGH I FEEL VERY COMFORTABLE WITH OUR PERFORMANCE COMPUTATIONS, I REALIZE THAT ONE SMALL OVERSIGHT CAN MAKE A HUGE DIFFERENCE.

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.