A B727 CREW; UPON ARR AT SANTO DOMINGO; (MDSD) LANDED LONG; RESULTING IN A RWY EXCURSION ONTO THE OVERRUN.

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FLT FROM ZZZ TO MDSD. LEG #3. NORMAL OPS TRIED UNEVENTFUL. WX IN SANTO DOMINGO (RPTED) WIND 040/5 SKY OVERCAST AT 1000 FT VIS TKM; RAIN. (CO-PLT FLYING) UPON ARR IN SANTO DOMINGO. WE WERE CLRED FOR A VOR/DME APCH TO RWY 35; FO MADE THE APCH AND FOLLOWED THE VASI ALL THE WAY DOWN. DURING THE FLARE I FELT HE WAS FLOATING A LITTLE AND TOLD HIM THAT I HAD THE AIRPLANE (CO-PLT'S SECOND FLT AFTER BEEN UPGRADED TO FO B727) I PUT THE AIRPLANE ON THE GND (WET RWY) I APPLIED BRAKES; SPEED BRAKES AND REVERSES; THE AIRPLANE HYDROPLANED. THE NOSE TURNED TO R THEN TO THE LEFT; I FINALLY GOT THE AIRPLANE TO GO STRAIGHT FORWARD I WAS UNABLE TO STOP THE AIRPLANE ON THE RWY AND THE ACFT CAME TO A STOP BEYOND THE END OF THE RWY AND ON THE STOPWAY. (COMPACTED GND AND ROCKS) THERE WERE NO INJURIES TO ANY PASSENGERS OR ANY PROPERTY DAMAGE OR DAMAGE TO ACFT). WE DEPLANED ALL THE PASSENGERS IN AN ORDERLY FASHION THRU THE AFT STAIRS AND WE BUSED THEM TO THE TERMINAL; LATER WE UNLOADED ALL THE BAGS FROM THE ACFT. A VISUAL INSPECTION MADE TO THE ACFT BY ME; MY CREW; MECHS FROM MY COMPANY; PLUS INSPECTOR FROM CIVIL AVIATION IN SANTO DOMINGO REVEALED NO DAMAGE TO THE ACFT. THE AIRPLANE WAS TOWED TO THE MAIN RAMP AT ARPT. NEXT MORNING ANOTHER INSPECTION WAS PERFORMED AND ACFT RETURNED TO SVC; THE SAME MORNING AND FLEW TO ZZZ AND BACK TO SANTO DOMINGO. (MDSD). NOTE: I AM NOT LOOKING FOR EXCUSES; BUT THE RWY IN SANTO DOMINGO LAS AMERICOS ARPT HAS A DOWN SLOPE; COMBINED WITH WET RWY (WHICH IS NOT GROOVED) SALT DEPOSITS FROM SEA BREEZE; AND A LOT OF RUBBER AT THE BEGINNING OF RWY 17 (PLUS THE POSSIBILITY OF TAIL WIND). ALTHOUGH WE WERE GIVEN AN APCH AND LNDG TO RWY 35; WHILE WAITING FROM THE PLANE MOVER TO ARRIVE WE NOTICED THAT THE FOLLOWING FLTS WERE DIRECTED TO RWY 17 RIGHT OVER OUR HEADS. WE ARE NOT THE FIRST ACFT THAT HAD RUN OFF THAT PARTICULAR RWY WE ARE LIKE #5 OR 6TH. THE LAST TWO ACFT WERE A DC9 AND B747. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR IN ADDITION TO REITERATING WHAT WAS RPTED; STATED THEY LANDED APPROX 3000 FT DOWN THE RWY AT APPROX 148 KTS; IN LIGHT RAIN. THE RPTED FACT OF OTHER ACFT SUFFERING THE SAME FATE AS HE; WAS ALSO MENTIONED. HE STATED OTHER ACFT HAVE DEPARTED THAT A PARTICULAR RWY; A DC9 APPROX 2 MONTHS AGO ALONG WITH A B747 AND DC8 ON DIFFERENT PRIOR OCCASIONS.