A TOUR HELI OPERATOR FOUND THAT A WT AND BAL WAS NOT BEING PREPARED FOR EACH FLT.

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I HAVE BEEN AN OWNER/OPERATOR OF HELIS FOR THE PAST 13 YRS. THE COMPANY OPS MANUALS; OPS SPECS AND PROCS HAVE BEEN APPROVED AND SUPERVISED BY THE LCL FSDO SINCE THE OP STARTED MANY YRS AGO. THE COMPANY CONDUCTS TOUR OPS UNDER FAR PART 135 REGS. DURING AN IN-HOUSE COMPANY AUDIT THAT I CONDUCTED NOV/XA/99; I NOTICED AN ANOMALY IN THE COMPANY PROCS WHICH MAY DIRECTLY PERTAIN TO THE SAFE OP OF THE TOUR FLTS. AS THE TOUR ORIGINATED AND ENDED AT THE SAME HELIPORT WITH THE SAME PAX LOAD CONFIGN; ONLY 1 PAX MANIFEST WAS BEING PREPARED BY THE COMPANY/PLT FOR THE FLT; ALTHOUGH THE FLT STOPPED ENRTE FOR REFUELING AND THE FUEL QUANTITY WAS DIFFERENT THAN THAT USED FOR THE WT AND BAL CALCULATION IN THE MANIFEST. IT WAS NOTICED; THAT SUCH ERRONEOUS CALCULATION OF THE WT AND BAL COULD BE POTENTIAL REASON FOR FLT OVER GROSS WT. AS A CORRECTIVE ACTION; THE COMPANY UNDER MY INSTRUCTIONS HAS FORMULATED A NEW PROC TO RECALCULATE A NEW WT AND BAL AT EACH REFUELING ALTHOUGH THE PAX LOAD CONFIGN REMAINS THE SAME. I WOULD LIKE TO BRING THIS TO YOUR NOTICE; SO THAT YOU COULD TAKE THE REQUIRED STEPS TO AVOID SIMILAR PROBS IN OTHER COMPANIES WHO ARE IN SUCH OP.