B737-700 DISPATCHER NOTES THE COMPANY FLT PLANNING COMPUTER IS DROPPING EXTRA FUEL REQUIRED BY AN FAA AD NOTE.

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I'D LIKE TO BRING ONE TO YOUR ATTN THAT HAS BEEN PLAGUING OUR OFFICE CONCERNING THE B737-700 AD FUEL. I HAVE BEEN WORKING DESK XX THIS WEEK; WHICH IS A LONG HAUL DESK. NEEDLESS TO SAY THE NEED FOR THE EXTRA FUEL ON THE B-700'S IS REQUIRED ON ALMOST EVERY FLT UNLIKE SOME OF THE SHORT HAUL DESKS. OVER A PERIOD OF SEVERAL DAYS I CAUGHT THE COMPUTER DROPPING THE EXTRA FUEL AFTER I HAD COMMANDED IT TO BE PUT IN THE MEL SECTION AND ADDED THE REMARK. UNFORTUNATELY; THERE APPEARS TO BE NO RHYME OR REASON FOR WHEN THE COMPUTER IS GOING TO DO THIS; IT JUST HAPPENS RANDOMLY. I HAVE DISCUSSED THIS PROB WITH OTHER DISPATCHERS AND THEY HAVE EXPERIENCED THE SAME PHENOMENON AS WELL. THE RELEASES I PREVIOUSLY SENT YOU ARE SOME OF THE SAME FLTS WHERE THE FUEL WAS DROPPED WHEN I MERELY CHANGED A BLEED SETTING IN THE PERFORMANCE SECTION OF THE WORK PLAN. THE ODD PART OF THIS PARTICULAR FLT IS; THE FUEL WAS MOVED FROM MEL TO TANKER FUEL; THEN; WHEN I SENT THE 3RD RELEASE TO CORRECT THIS; IT TOOK THE FUEL BACK OUT OF THE TANKER FUEL. THIS IS THE ONLY MISTAKE I HAVE CAUGHT ON PAPER DUE TO IT HAPPENING WHEN I SENT A NEW RELEASE. I HAVE SEEN THE FUEL DROP FOR A VARIOUS NUMBER OF OTHER REASONS FROM THE 'FLT PLANNING/RELEASE' SIDE OF ACR FLT PLANNING COMPUTER (NOT THE RESET AND REPLAN FUNCTION WHICH STARTS YOU OVER THE SCRATCH). ACR FLT PLANNING COMPUTER HAS DROPPED THIS FUEL DUE TO SIMPLY CHANGING A HOLD TIME OR ADDING AN ALTERNATE ON THE ORIGINAL PLAN. IT IS NOT JUST ANNOYING BUT NEEDLESS TO SAY; A SAFETY ISSUE AS WELL AS MAKING A DISPATCHER VULNERABLE SHOULD THIS FUEL DROP AFTER THE FACT AND IS NOT CAUGHT BY THE DISPATCHER. FORTUNATELY; IN THE EXAMPLE I SENT TO YOU; I CAUGHT THE 'DROPPING' OF THIS FUEL BEFORE DEP AS I WAS GLANCING OVER THE B-700'S TO MAKE SURE I HAD COMPLIED WITH THE AD. HAD IT BEEN A BUSIER NIGHT; I MAY NOT HAVE BEEN AFFORDED THE TIME TO DO SO.