FLT CREW OF A310 ALLOW LOAD PLANNERS TO CONVINCE THEM THAT AN MEL ITEM PROHIBITING THE CARRIAGE OF LIVE ANIMALS WITH A FAILED AC PACK COULD BE IGNORED.

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DURING TAXI FOR TKOF; WE RECEIVED AN ECAM WARNING THAT THE #1 AIR CONDITIONING PACK HAD FAULTED. WE ATTEMPTED ONE RESET PER PROCS; BUT IT WAS UNSUCCESSFUL. THE MEL PERMITTED CONTINUED FLT WITH SEVERAL RESTRS INCLUDING LIMITING THE CRUISE ALT TO FL310 AND THE NOTATION THAT NO LIVE CARGO COULD BE ON BOARD. WE CALLED OPS ON THE RADIO TO DISCUSS THE SITUATION AS OUR HAZARDOUS CARGO PAPERWORK INCLUDED THE NOTATION THAT LIVE CARGO HAD BEEN LOADED ON THE ACFT. THE OPS SPECIALIST INFORMED US THAT HE WOULD RECALCULATE OUR FLT PLAN FOR FL310 AND THAT OUR OTHER FREIGHT HAD A HIGHER PRIORITY THAN THE LIVE CARGO SO THAT WE WERE AUTH TO CONTINUE. I ASKED TO SPEAK TO THE DUTY OFFICER TO DISCUSS OPERATING IN OPPOSITION TO THE MEL. THE DUTY OFFICER THEN CAME ON THE RADIO AND SAID THAT THE LIVE CARGO WAS OF VERY LOW PRIORITY AND THAT WE WERE AUTH TO CONTINUE THE FLT. I ASKED AGAIN ABOUT OPERATING IN OPPOSITION TO THE MEL AND THE DUTY OFFICER AGAIN ASSURED ME THAT THIS OP WAS AUTH. WE CONTINUED THE TAXI AT THIS POINT; AND DEPARTED FOR BWI. ONCE AT CRUISE ALT; I PULLED OUT THE MEL AGAIN AND READ THROUGH THE FRONT MATTER WHICH GIVES INSTRUCTIONS ON THE USE OF THE MEL. BY THIS POINT; OF COURSE; I KNEW THAT THE DUTY OFFICER IS NOT EMPOWERED TO AUTH DEVS FROM THE MEL; BUT I WANTED TO MAKE SURE. MY DESIRE TO ACCOMPLISH THE MISSION; AIDED BY THE ENCOURAGEMENT OF BOTH THE OPS SPECIALIST AND THE DUTY OFFICER CAUSED ME TO OVERRIDE MY OWN KNOWLEDGE OF MEL USAGE AND TO OPERATE THE TRIP AGAINST THE MEL INSTRUCTIONS. I SHOULD HAVE TAXIED BACK TO THE GATE TO UNLOAD THE LIVE CARGO PRIOR TO DEPARTING. THE CARRIAGE OF LIVE FREIGHT OF THIS NATURE AND FOR THIS CUSTOMER IS RELATIVELY NEW TO OUR OP. THE CUSTOMER HAS INDICATED THAT THEY WILL ACCEPT SOME UNSPECIFIED AMOUNT OF CARGO LOSS IN THIS CONTRACT; THEREFORE OUR MGMNT HAS INDICATED TO THE PLTS THAT THIS FREIGHT IS OF LOW PRIORITY. HOWEVER; THIS DOES NOT RELIEVE THE PLTS OF THE OVERRIDING RESPONSIBILITY TO OPERATE THE ACFT IN A LEGAL MANNER. LESSON LEARNED.