A300 ACFT WAS DISPATCHED ILLEGALLY BECAUSE BOTH R REVERSER INOP AND R MAIN WHEEL BRAKE INOP DEFERRED.

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THIS RPT REFERS TO NON COMPATIBLE MEL DEFERRALS AND WHAT PART THE FLC CAN PLAY TO PREVENT OVERSIGHTS LIKE THIS FROM OCCURRING. ON DEC/XA/97 MY CREW WAS ASSIGNED AN A300 ACFT TO FLY A REGULAR SCHEDULED FLT FROM JFK; NY; TO BQN; PR. WE WERE INFORMED THAT IN ADDITION TO A DEFERRED INOP R THRUST REVERSER THE PLANE ALSO HAD 1 R MAIN WHEEL BRAKE DEACTIVATED AND DEFERRED DUE TO DRAGGING AND OVERHEATING. MAINT WAS WORKING TO REPAIR THE BRAKE BEFORE DEP. AT DEP TIME MAINT DETERMINED THAT THE REPAIR COULD NOT BE ACCOMPLISHED AND THE ACFT WOULD BE DISPATCHED WITH THE ORIGINAL MEL DEFERRALS IN PLACE. THEY RETURNED THE LOGBOOK WITH ALL PROPER SIGNOFFS AND MEL NUMBERS RECORDED. UPON ARRIVING AT OUR DEST; WE WERE INFORMED BY THE COMPANY THAT A MISTAKE HAD BEEN MADE AND THE ACFT SHOULD NOT HAVE BEEN DISPATCHED. ACCORDING TO MEL RESTRS THE ACFT CANNOT BE OPERATED WITH AN INOP BRAKE AND AN INOP THRUST REVERSER ON THE SAME SIDE. ALTHOUGH THE FLT AND LNDG WERE UNEVENTFUL; THE IMPROPER MEL DEFERMENTS CREATED A TECHNICAL ILLEGALITY. I HOPE IN FUTURE RECURRENT TRAINING CLASSES THAT WE WILL MAKE A POINT OF ENCOURAGING CREWS TO TAKE A MOMENT (EVEN WHEN PRESSING AGAINST DEP SCHEDULE) TO REVIEW THE DEFERRED ITEMS IN THE MEL FOR POSSIBLE RESTRS. MOST MEL ITEMS ARE ONLY A PARAGRAPH OR TWO LONG BUT PACKED WITH INFO. I'LL BET I'LL BE DOING IT.