A B747-300 FREIGHTER WAS REPEATEDLY DISPATCHED WITH AN INCORRECT WT FOR AN ONBOARD MAINT FLY AWAY TIRE KIT.

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THE PURPOSE OF THIS FORM IS TO DOCUMENT OPERATIONAL SHORTCOMINGS IDENTED BY CREW MEMBERS. ACR HAS INITIATED AN INTERNAL EVALUATION PROCESS WHICH ENCOURAGES EMPLOYEES TO INFORM MGMNT OF OPERATIONAL PROBS OR CONCERNS. THE CREW WAS INFORMED BY THE HANDLING AGENT THAT BROUGHT THE WT AND BAL TO THE ACFT THAT WE HAD 2 TIRES ON BOARD IN THE FLYAWAY KIT. THIS WAS REFLECTED IN THE BALLAST (OTHER) BLOCK ON OUR WT AND BAL AS 280 KG'S. WE APPLIED THE REST OF THE INFO AND DEPARTED ON THE WAY TO ZZZ. ONCE AIRBORNE WE REVIEWED THE WT AND BAL BOOKS AN AT THE TIME WE REALIZED THAT THE AGENT HAD THE WRONG WT FOR THE TWO TIRES. ACFT TABLE REFLECTS THE WT FOR TWO TIRES IS 420 KG'S FOR THIS ACFT; NOT 280 KT'S. IT IS NOT VERY CLR IF BY THE STATEMENT THE ADDITIONAL WT GETS APPLIED IN THE LOAD PLANNER OR ON THE FINAL CREW FORM. WE HAD FLOWN THE 2 PREVIOUS LEGS WITHOUT BEING INFORMED THAT THE TIRES WERE ON BOARD. WE REVIEWED THE OTHER FLT ENVELOPES ON THE ACFT AND REALIZED THAT OUT OF 16 OTHER FLTS; ONLY 1 WAS CORRECT. WE ARRIVED IN ZZZ AND HAD THE STATION SUPERINTENDENT MEET THE FLT. HE WAS NOT INFORMED OF THE TIRES IN THE FLYAWAY KIT; AND EXPLAINED THAT ACR 1 DOES IT DIFFERENT. HE INDICATED THAT ACR 1 APPLIES THE INFO TO THE WT AND BAL ADVISORY ON THE FLT RELEASE. ALL THE ACR 2 RELEASES SHOW ARE THE BASIC OPERATING WT; INCLUDING BASIC CREW AND NOT ANYTHING ELSE. I ASKED THAT HE MAKE THE CHANGES. ACR 2 CREW SHOULD BE BETTER INFORMED AS TO WHAT IS ON BOARD THE MAINT SUPPORT ITEMS WT. THE INFO SHOULD BE ON THE FLT RELEASE; OR BY THE INFO POSTED ON THE ACFT LOGBOOK. MY CONCERN IS HOW MANY OTHER ACR 2 FLTS HAVE NOT HAD THE CORRECT INFO SINCE THE IMPLEMENTATION OF THE NEW WT AND BAL PROCS.