Narrative:

I have just found out that on about XA55 local time, mar/xa/99, we took off from runway 26 at iah using runway 15 data from accuload. I was international relief officer on that flight. I can't recall at this time what the accuload data indicated, but at the time I looked at it there were no 'red flags' in my mind on what was programmed in the FMC. In other words, the FMC and accuload corresponded from my vantage point in the rear jump seat. How we were suckered into using runway 26 with no valid data, I can't figure out. Flight was from iah to nrt, japan. I believe the problem was caused by absence of unrelentless vigilance in xchking and doublechking data that is received in relation to what is actually going on and programmed. What I learned was that I must constantly look diligently and carefully at all data concerning the flight and constantly xchk the data with what is going on or demanded of the flight. I have prided myself with being careful and conservative in my flying profession. I am embarrassed that this happened to me as a crew member. It is estimated the B777 aircraft took off overgrossed 2000-5000 pounds from the information that I have received.

Related reports:

Google
 

Original NASA ASRS Text

Title: A B777 PERFORMS A TKOF FROM RWY 26 AT IAH, TX, USING DATA FROM THE ACCULOAD FOR RWY 15. TKOF WT WAS LATER DETERMINED TO BE OVER RWY AUTH TKOF WT.

Narrative: I HAVE JUST FOUND OUT THAT ON ABOUT XA55 LCL TIME, MAR/XA/99, WE TOOK OFF FROM RWY 26 AT IAH USING RWY 15 DATA FROM ACCULOAD. I WAS INTL RELIEF OFFICER ON THAT FLT. I CAN'T RECALL AT THIS TIME WHAT THE ACCULOAD DATA INDICATED, BUT AT THE TIME I LOOKED AT IT THERE WERE NO 'RED FLAGS' IN MY MIND ON WHAT WAS PROGRAMMED IN THE FMC. IN OTHER WORDS, THE FMC AND ACCULOAD CORRESPONDED FROM MY VANTAGE POINT IN THE REAR JUMP SEAT. HOW WE WERE SUCKERED INTO USING RWY 26 WITH NO VALID DATA, I CAN'T FIGURE OUT. FLT WAS FROM IAH TO NRT, JAPAN. I BELIEVE THE PROB WAS CAUSED BY ABSENCE OF UNRELENTLESS VIGILANCE IN XCHKING AND DOUBLECHKING DATA THAT IS RECEIVED IN RELATION TO WHAT IS ACTUALLY GOING ON AND PROGRAMMED. WHAT I LEARNED WAS THAT I MUST CONSTANTLY LOOK DILIGENTLY AND CAREFULLY AT ALL DATA CONCERNING THE FLT AND CONSTANTLY XCHK THE DATA WITH WHAT IS GOING ON OR DEMANDED OF THE FLT. I HAVE PRIDED MYSELF WITH BEING CAREFUL AND CONSERVATIVE IN MY FLYING PROFESSION. I AM EMBARRASSED THAT THIS HAPPENED TO ME AS A CREW MEMBER. IT IS ESTIMATED THE B777 ACFT TOOK OFF OVERGROSSED 2000-5000 LBS FROM THE INFO THAT I HAVE RECEIVED.

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.