PLT OF SMA ACFT LANDED BEHIND ANOTHER DEPARTING SMA ACFT AT AN UNCTLED ARPT RESULTING IN A NMAC. LNDG ON OCCUPIED RWY. NON TWR ARPT.

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ON JAN/MON/93; APPROX XA30 PM LCL TIME; MY PAX AND I WERE RETURNING TO MY HOME BASE; ROCK SPRINGS; WY; IN AN SMA SINGLE ENG LAND ACFT AFTER SPENDING OVERNIGHT IN WENDOVER; NV. RKS PROVIDES 24 HR UNICOM SVC AND IS WITHIN A CTL ZONE. I WAS LNDG AT RKS AND CALLED FOR AN ARPT ADVISORY 12 MI SW OF THE ARPT. I WAS ADVISED THAT THERE WAS AN SMA SINGLE ENG LAND TAXIING. NO OTHER ACFT HAD MADE RADIO CONTACT. THE SKY WAS CLR; WINDS CALM AND VISIBILITY 10 MI. THERE WAS THIN PATCHY ICE ON THE RWY AND BRAKING ACTION WAS FAIR. I ANNOUNCED THAT WE WOULD USE RWY 27. I ENTERED A DOWNWIND LEG FOR RWY 27 AT 7000 FT MSL; L BASE; AND ANNOUNCED THAT I WAS GOING TO SHOOT A PRACTICE ILS APCH. MY PAX; A 2500 HR PRIVATE PLT; AGREED TO ACT AS MY SPOTTER. I CALLED MY L BASE; PRACTICE ILS APCH. AT THIS POINT; ANOTHER ACFT CALLED FOR AN ARPT ADVISORY 20 MI SE OF THE ARPT; AND THE SMA SINGLE ENG LAND ANNOUNCED THAT IT WOULD HOLD ON 27 UNTIL THE OTHER ACFT LANDED. I ADVISED THAT I WAS ON FINAL; PRACTICE ILS; RWY 27; FULL STOP. I PASSED THE OUTER AND MIDDLE MARKERS; AND HAD JUST PASSED THE INNER MARKER. WHEN I LOOKED UP I SAW THE SMA 2 HOLDING ON 27; BUT I ALSO SAW AN SMA SINGLE ENG LAND ACFT 3 PULL OUT FROM AN INTXN ON 27 AND BEGIN TO ROLL FOR TKOF. THE SMA 3 HAD MADE NO RADIO CONTACT. I TOLD MY SPOTTER THAT WE HAVE ANOTHER AIRPLANE ON THE RWY. AS I PASSED THE THRESHOLD; THE SMA 3 WAS APPROX 80 FT BELOW ME AND APPROX 120 FT IN FRONT OF ME. I DECIDED THAT THE BEST COURSE OF ACTION WOULD BE TO COMPLETE MY LNDG AS MY AIRSPD WAS LOW; 65 KTS; AND DROPPING; AND EVASIVE ACTION WOULD HAVE BEEN DIFFICULT. I KNEW THAT I COULD NOT ABORT MY LNDG AS THE SMA 3 WAS TAKING OFF AND I WOULD FLY INTO THE BACK OF THE SMA 3; NOR COULD I MAKE ANY TURNS BECAUSE OF MY LOW AIRSPD; WHICH WOULD RESULT IN A STALL; AND BECAUSE I DID NOT KNOW WHICH WAS THE SMA 3 WOULD TURN AFTER TKOF. MY SPOTTER ATTEMPTED TO MAKE RADIO CONTACT WITH THE DEPARTING SMA 3; BUT IT MAINTAINED RADIO SILENCE. IT IS MY IMPRESSION THAT IF THE SMA 3 HAD MADE ANY RADIO CONTACT; EVEN ASKING FOR AN ARPT ADVISORY WHILE TAXIING; I WOULD HAVE BEEN AWARE OF IT AND LOOKING FOR IT. SIMILARLY; IF THE SMA 3 WAS MONITORING ITS RADIO; IT WOULD HAVE KNOWN THAT AN ACFT WAS ON FINAL FOR 27. AS A RESULT; I HAVE TO CONCLUDE THAT THE SMA 3 EITHER DID NOT HAVE A RADIO; OR IT HAD A RADIO BUT WAS OFF OR ON THE WRONG CHANNEL. IT IS CLR THAT RADIO COM IS IMPORTANT; AS WELL AS KEEPING AN EYE OUT FOR OTHER NON-COMMUNICATING ACFT.