Narrative:

After lengthy and unexpected taxi instructions from ground; I wrote down the instructions and expanded my airport diagram so as not to leave my captain in the lurch. 14L data was not on the tps so; after I made sure my partner knew his way to the runway; I requested tps 14L. Since we were expecting 22L; I entered the new runway in the FMC. Even selected 14LX in the FMC; as X was listed for intersection U2. What neither of us caught was the tps data was for full length 14L. The ensuing takeoff was long! We both realized our mistake; and after the climb went over the tps very carefully. We were probably 4;000 pounds too heavy for the runway. Stop the aircraft before the runway; and make darn certain the correct runway and intersection is what's displayed on the tps and the correct flaps/thrust setting correlates with it. I was distracted by a circuitous and unfamiliar taxi route and I should have asked my captain to take some time; short of the runway to review the unfamiliar data. He was taxiing slowly; but I was still playing catch up.

Google
 

Original NASA ASRS Text

Title: B737-800 flight crew reports departing Runway 14L from Taxiway U2 at ORD without verifying that U2 is an authorized intersection in the TPS [Takeoff Performance System] preplan. The result is a lift off point very close to the end of the runway.

Narrative: After lengthy and unexpected taxi instructions from ground; I wrote down the instructions and expanded my airport diagram so as not to leave my Captain in the lurch. 14L data was not on the TPS so; after I made sure my partner knew his way to the runway; I requested TPS 14L. Since we were expecting 22L; I entered the new runway in the FMC. Even selected 14LX in the FMC; as X was listed for intersection U2. What neither of us caught was the TPS data was for full length 14L. The ensuing takeoff was long! We both realized our mistake; and after the climb went over the TPS very carefully. We were probably 4;000 pounds too heavy for the runway. Stop the aircraft before the runway; and make darn certain the CORRECT RUNWAY AND INTERSECTION is what's displayed on the TPS and the correct flaps/thrust setting correlates with it. I was distracted by a circuitous and unfamiliar taxi route and I should have asked my Captain to take some time; short of the runway to review the unfamiliar data. He was taxiing slowly; but I was still playing catch up.

Data retrieved from NASA's ASRS site as of July 2013 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.