AN A300 FLC LANDS OVERWT AT BDA AFTER HAVING DIVERTED FOR A PAX MEDICAL EMER. THE CREW DOESN'T REALIZE THE OVERWT OMISSION AND FAILS TO ENTER SAME IN LOGBOOK FOR THE REQUIRED INSPECTION. THEY PROCEED ON TO SJU.

Narrative

ENRTE TO SJU THE PURSER ADVISED ME THAT AN ELDERLY MALE PAX APPEARED ILL AND UNRESPONSIVE. PHYSICIAN ASSISTANCE WAS SUMMONED AND TREATMENT BEGUN. THE PHYSICIANS ADVISED ME THAT IT WAS NECESSARY TO LAND TO OBTAIN ADVANCED CARDIAC CARE FOR THE PAX. AN EMER WAS DECLARED WITH NY COMMERCIAL RADIO. DISPATCH WAS CONTACTED AND A RE-RELEASE TO BDA WAS OBTAINED. THE FO AND I BECAME EXTREMELY BUSY WITH THE DIVERT. NEITHER OF US WERE FAMILIAR WITH BDA; SO WE BEGAN TO STUDY THE CHARTS. DURING THIS TIME WE HAD SEVERAL CONVERSATIONS WITH THE CABIN REGARDING THE PAX CONDITION. WHILE WE WERE MAKING PREPARATION FOR LNDG WE OVERLOOKED; OR MISTOOK I SHOULD SAY; THE LNDG WT. BOTH OF US MISTOOK THE LNDG WT TO BE 306000 LBS WHEN IN FACT IT WAS AROUND 326000 LBS. WE RECEIVED AN INTERPHONE CALL FROM THE CABIN ABOUT THIS TIME THAT THE PAX CONDITION HAD DETERIORATED AND IT WAS NECESSARY TO LAND QUICKLY. AN UNEVENTFUL SMOOTH LNDG WAS MADE AT BDA. ON THE GND I TOOK MEASURES TO ENSURE THE QUICK DEPLANE OF THE PAX AND TO MAKE SURE THAT NO CUSTOMS PROBS OCCURRED. MEANWHILE THE AGENTS WERE TRYING TO GET ME TO THE PHONE AS THE DISPATCHER WANTED TO SPEAK WITH ME. AFTER TAKING CARE OF A PROB WITH THE DISPATCHER; I BECAME INVOLVED WITH A FUELING PROB. MEANWHILE A FAULTY ELECTRIC CART WAS GIVING THE FO PROBS. OUR APU WAS INOP AND HE HAD A DIFFICULT TIME KEEPING ELECTRICAL PWR ON THE ACFT. WE MANAGED TO REFUEL AND DEPART IN FAIRLY SHORT ORDER. ENRTE WE REALIZED WE HAD IN FACT LANDED OVERWT AT BDA AND HAD NEGLECTED TO REQUEST AN OVERWT LNDG INSPECTION. UPON ARR AT SJU MAINT WAS CONTACTED AND PROPER LOG ENTRY WAS MADE. THIS COULD HAVE BEEN PREVENTED HAD WE NOT MISTAKEN THE WT IN THE FIRST PLACE. THE URGENT SIT CAUSED US TO FOCUS TOO INTENTLY ON THE LNDG AND DEPLANING OF THE ILL PAX. A LITTLE CLOSER ATTN NEXT TIME.