Narrative:

Initial flight plan called for ZFW 124.1 and tog of 142 based on planned fuel. Initial planned weight manifest showed ZFW 116.3 and tog of 133.6. Final weights showed ZFW 125.1 and tog 142.4. There was a huge inaccuracy in the final runway data for our flight. The final runway data showed the correct ZFW of 125.1; but indicated the tog as only 134.3 as compared to the actual as computed manually by the first officer as 143.1. This 9000 pounds error in the runway data was caught only through the manual weight verification by the first officer. Otherwise; we would have taken off with the wrong speeds and reduced thrust setting. Dispatch was notified and they checked with lp. An immediate cause for the error was not idented.

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Original NASA ASRS Text

Title: A320 FLT CREW MANUAL CHK OF ACFT TKOF WTS DISCOVERS 9000 LB ERROR IN COMPUTER GENERATED TKOF DATA MESSAGE.

Narrative: INITIAL FLT PLAN CALLED FOR ZFW 124.1 AND TOG OF 142 BASED ON PLANNED FUEL. INITIAL PLANNED WT MANIFEST SHOWED ZFW 116.3 AND TOG OF 133.6. FINAL WTS SHOWED ZFW 125.1 AND TOG 142.4. THERE WAS A HUGE INACCURACY IN THE FINAL RWY DATA FOR OUR FLT. THE FINAL RWY DATA SHOWED THE CORRECT ZFW OF 125.1; BUT INDICATED THE TOG AS ONLY 134.3 AS COMPARED TO THE ACTUAL AS COMPUTED MANUALLY BY THE FO AS 143.1. THIS 9000 LBS ERROR IN THE RWY DATA WAS CAUGHT ONLY THROUGH THE MANUAL WT VERIFICATION BY THE FO. OTHERWISE; WE WOULD HAVE TAKEN OFF WITH THE WRONG SPDS AND REDUCED THRUST SETTING. DISPATCH WAS NOTIFIED AND THEY CHKED WITH LP. AN IMMEDIATE CAUSE FOR THE ERROR WAS NOT IDENTED.

Data retrieved from NASA's ASRS site as of January 2009 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.