RPTR WAS NOT ADVISED THAT THE BRAKING ACTION WAS NIL AND SLID OFF THE RWY ON LNDG.

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ON THE MORNING OF FEB/TUE/94 WHILE LNDG AT MGY; DAYTON; OH; FOR THE PURPOSE OF BOARDING PAX TO CONDUCT A 135 FLT; THE ACFT SPUN APPROX 180 DEGS AND SLID OFF THE R SIDE OF THE RWY; BACKWARD. THERE WAS NO DAMAGE TO ACFT OR ARPT. THIS UNCTLED MANEUVER WAS CAUSED BY WINDS IN EXCESS OF 20 KTS. AND A RWY SURFACE COMPLETELY COVERED BY FREEZING RAIN. ALTHOUGH A COMPLETE BRIEFING HAD BEEN OBTAINED FROM DAYTON FLT SVC 30 MINS PRIOR TO THE EVENT; NO MENTION OF HAZARDOUS RWY CONDITIONS WAS OFFERED. THIS IS; OF COURSE; CONSISTENT WITH THE FACT THAT THERE IS NO OBSERVER STATIONED AT MGY. THE PROB WITH THIS EVENT IS THE FACT THAT AS SOON AS I REACHED A TELEPHONE IN THE FBO; I PHONED DAYTON FSS; SPEAKING TO MR. X; ASKING THEM TO ISSUE A NOTAM OR AT LEAST A PIREP FLT PRECAUTION ON THE RWY AT MGY; INFORMING MR. X THAT THE RWY WAS COVERED WITH FROZEN RAIN; BRAKING ACTION WAS '0' AND CONDITIONS WERE VERY HAZARDOUS. HE REPLIED THAT IT WOULD BE DONE. APPROX 90 MINS LATER; UPON RETURNING TO BASE OF OPS AT LUK; I RETRIEVED THE LATEST WX FOR DAYTON AND MGY. THERE WAS NO MENTION OF RWY CONDITIONS AT MGY! THE LCL FSDO IS NOW INVESTIGATING THE SIT; AND THERE IS NO RECORDED EVIDENCE; ACCORDING TO DAYTON FSS; THAT I EVER CALLED! I FEEL THAT SOMEONE AT FSS DROPPED THE BALL. MY QUESTION IS 'IS IT POSSIBLE THAT SOMEONE ELSE; ANOTHER PLT PERHAPS; MAY HAVE RPTED THE RWY CONDITION AT MGY PRIOR TO MY BRIEFING AND THAT INFO AS WELL WAS NEGLECTED?' HAVING RECEIVED THAT INFO ON A TIMELY BASIS WOULD HAVE PREVENTED MY MISHAP!