DRG ARRIVAL, RYAN AIR FLT 2401 (CESSNA 402, N12333) CONTACTED NOME FSS & RPRTD 15 MI WEST OF NOME. THE PLT WAS ADZD THE WX AT NOME WAS BELOW BASIC VFR. THE PLT REQUESTED A SPECIAL VFR CLNC. HE WAS ADZD TO REMAIN IN VFR CONDITIONS OUTSIDE THE CONTROL ZONE & TO STANDBY FOR A CLNC. LATER, WHEN FSS PSNL TRIED TO CONTACT FLT 2401 TO ISSUE THE CLNC, THERE WAS NO REPLY FROM THE PLT. SUBSEQUENTLY, A SEARCH WAS INITIATED FOR THE ACFT. FOUR DAYS LATER, IT WAS FOUND WHERE IT HAD CRASHED AT ABOUT 450' MSL ON THE EAST EDGE OF SLEDGE ISLAND, APRX 18 MI WEST OF NOME. AN EXAM OF THE WRECKAGE REVEALED THE ACFT HAD CRASHED INTO RISING TERRAIN, WHILE IN LEVEL FLT ON A HEADING OF ABOUT 250 DEG. NO PREIMPACT MECHANICAL PROBLEM WAS EVIDENT. THE 1300 ADT WX AT NOME WAS IN PART: 400' OVC, VIS 2 MI WITH RAIN & FOG, WIND FROM 120 DEG AT 12 KTS.