DC8 ANTI-SKID WAS MEL'ED INOP. CREW IGNORED PERFORMANCE LIMITATIONS.

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ACR FLT ABC WAS DISPATCHED ILN-BFI AT XA14Z. THE DISPATCH INCLUDED A DEFERRAL FOR ANTI-SKID BEING INOP. THIS WAS PART OF AN AMENDED RELEASE AS THE ANTI-SKID PROB WAS NOT DISCOVERED UNTIL AFTER START AND TAXI. THE DEFERRAL IS AUTH WITHIN THE CONFINES OF THE ACFT OPERATING MANUAL OF THE ACR. UPON ARR IN THE SEATTLE TERMINAL AREA; THE FLT HAD STARTED A DIVERSION TO THE SEATAC ARPT DUE TO THE FACT THAT IN THE CONFIGN AS DISPATCHED; THE RWY THAT THE FLT HAD BEEN DISPATCHED TO; WAS NO LONGER USABLE DUE TO WINDS ON THE SURFACE. WHEN STARTING THE APCH AND LNDG PHASE; AFTER THE GEAR WAS LOWERED; IT WAS DISCOVERED THAT THE ANTI-SKID HAD BECOME FUNCTIONAL; AND THE PIC ELECTED TO EXECUTE A MISSED APCH AND LAND AT THE ORIGINAL INTENDED DEST; BFI. THIS WAS ACCOMPLISHED BY NORMAL PROCS; NO INCIDENT; NO ACCIDENT; NORMAL LNDG AND ROLLOUT XF44Z. AFTER LNDG AND CLRING THE RWY; THE ANTI-SKID WAS DISARMED AND THEN REARMED FOR TESTING AND WAS AGAIN DISCOVERED TO HAVE FAILED AFTER COMPLETION OF THE FLT. PIC FEELS AT THIS TIME THAT BETTER JUDGEMENT WOULD HAVE BEEN TO CONTINUE AND LAND SEA RATHER THAN BFI AS WAS DONE. THE REASON THAT THE FLT WAS LANDED AT BFI WAS THAT THE ANTI-SKID HAD APPEARED TO HAVE CORRECTED ITSELF; AND NOW WAS FULLY FUNCTIONAL. EVEN THOUGH THIS HAD OCCURRED; IT IS POSSIBLE THAT HAD AN EVENT OCCURRED THAT WOULD HAVE CREATED AN INCIDENT OR ACCIDENT; THIS MAY HAVE BEEN IN VIOLATION OF THE ACFT OPERATING MANUAL.