FLC RETURNS AND LANDS OVER MAX LNDG GROSS WT.

Narrative

AFTER TKOF; WHILE DEALING WITH FAILURE OF FO'S AIRSPD INDICATOR REQUIRING RETURN TO POINT OF DEP; A 10000 LB TKOF FUEL DISCREPANCY WAS DISCOVERED ON THE COMPANY COMPUTER GENERATED FLT PLAN. THE CORRECT TKOF FUEL OF 33500 LBS WAS PRINTED IN THE FUEL COLUMN. THE INCORRECT FUEL OF 23500 LBS WAS PRINTED IN THE R-HAND COLUMN IMMEDIATELY UNDER THE WT AND BAL ZERO FUEL WT. THE INCORRECT FUEL WAS USED BY WT AND BAL PERSONNEL TO GENERATE THE COMPUTERIZED WT AND BAL FORM; LEADING TO A WT AND BAL TKOF GROSS WT 10000 LBS TOO LIGHT. TKOF PERFORMANCE NUMBERS WERE THEN CALCULATED BY THE CREW USING THIS INCORRECT TKOF GROSS WT FIGURE. FORTUNATELY THE AIRPLANE WAS LIGHTWT WITH VALSAN ENGS; AND NO ABNORMAL FLT CHARACTERISTICS WERE NOTED DURING TKOF. THE WT AND BAL ZERO FUEL WT PLUS THE ACTUAL FUEL ON BOARD WERE USED TO COMPUTE THE CORRECT LNDG WT AND ASSOCIATED LNDG PERFORMANCE DATA PRIOR TO LNDG WHICH WAS UNEVENTFUL. THIS APPEARS TO BE A TRANSPOSITION ERROR BEGINNING WITH COMPANY AND CONTINUING ON DOWN THE LINE; ESCAPING VERIFICATION BY BOTH WT AND BAL PERSONNEL AND THE FLC. IT APPEARS THAT 10000 LB ERRORS MAY BE PARTICULARLY VULNERABLE TO BEING MISSED DURING VERIFICATION. RECOMMEND EMPHASIS ON VERIFICATION AT COMPANY WT AND BAL PERSONNEL; AND FLC LEVELS. ALSO RECOMMEND COMPUTER PROGRAM TO COMPARE AND REJECT NUMBERS WHICH ARE SUPPOSED TO BE EQUAL ON THE FLT PLAN; BUT ARE NOT.