A300 CREW HAD AN MEL ITEM RENDERING THE TAIL TRIM TANK INOP. THERE WAS FUEL IN THE TRIM TANK IN NON COMPLIANCE WITH THE MEL. A MECH WAS ABLE TO RELEASE THE FUEL IN THE TRIM TANK.

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PRIOR TO DEP; STATION PERSONNEL AT SJU CALLED AND ADVISED THAT THE CAPT FOR FLT HAD REQUESTED THAT THE FUELER PUT AN ADDITIONAL 1500 LBS ON BOARD THE ACFT ABOVE THE REQUIRED RELEASE FUEL. WHEN I DISCUSSED THIS REQUEST WITH THE CAPT I DISCOVERED THE FOLLOWING: 1) THE ACFT HAD AN MEL APPLIED AGAINST THE CTR OF GRAVITY CTL SYS. THIS MEL REQUIRES THAT IF THERE IS ANY FUEL IN THE TRIM (TAIL) TANK THAT FUEL MUST BE CONSIDERED UNUSABLE BALLAST. 2) 1500 LBS OF FUEL WAS TRAPPED IN THE TRIM TANK FROM A PREVIOUS FLT AND WAS ACCOUNTED FOR IN THE WT AND BAL SYS AS AN EMPTY OPERATING WT EXCEPTION. 3) THIS IS THE ONLY ACFT IN THE FLEET THAT ACCOUNTS FOR BALLAST FUEL AS AN EMPTY OPERATING WT EXCEPTION. 4) AS A RESULT; THIS BALLAST FUEL DOES NOT SHOW UP ON THE FUEL SLIP PROVIDED TO THE FUELERS. 5) THE FUELER IN THIS CASE STOPPED FUELING WHEN THE TOTALIZER GAUGE EQUALED THE FUEL SLIP AMOUNT. 6) THE CAPT CAUGHT THE DISCREPANCY AND HAD THE FUELER PUT THE MINIMUM REQUIREMENT ON BOARD PRIOR TO DEP. 7) THIS WAS AN EXCEPTIONALLY GOOD CATCH ON THE CAPT'S PART SINCE THE WT AND BAL SYS DOESN'T SHOW THE BALLAST FUEL IN THIS CASE; CONTRARY TO THE A300 AM-PERFORMANCE SECTION. 8) SUBSEQUENT TO THE CAPT'S ACTIONS; A MECH WAS ABLE TO FREE THE TRAPPED FUEL AND PUMP IT INTO THE WINGS; CREATING USABLE FUEL. HOWEVER; WITHOUT THE CAPT ACTIONS; THE FLT MAY HAVE DEPARTED WITHOUT MINIMUM USABLE FUEL. THE WT AND BAL PROC FOR THIS MEL ARE CONTRARY TO PUBLISHED PROCS IN THE ACFT'S OPERATING MANUAL.