THE FLC OF A BEECH 1900D HITS THE WAKE OF A B747 THAT WAS 6 MI AHEAD OF THEM AT 10000 FT. THE BEECH 1900D ROLLS SEVERAL TIMES; INCLUDING A BANK ANGLE OF 60 DEGS FOR 1 ROLL WITH FULL OPPOSITE AILERON APPLIED.

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PASSED OVER VTU VOR INBOUND ON SADDE 6 ARR. INSTRUCTED BY SOCAL APCH TO 'PROCEED DIRECT SANTA MONICA ARPT; CAUTION WAKE TURB IN TRAIL OF HVY B747 6 MI.' WE WERE THEN CLRED TO DSND TO 10000 FT MSL; WE RPTED BOTH THE B747 AND LAX ARPT IN SIGHT. UPON ARRIVING AT 10000 FT; WE FELT TURB IN A SERIES OF BUMPS (APPROX 3-6) AND THEN ACFT TOOK A ROLL OF 60 DEGS TO STARBOARD; THE FO CORRECTED; AND ACFT THEN ROLLED 45 DEGS TO THE L. WE TOOK SEVERAL SMALLER ROLLS IN EACH DIRECTION BEFORE THE ACFT STABILIZED. WX WAS UNUSUALLY CLR (NO SMOG) FOR THE LOS ANGELES BASIN. BOTH THE FO AND MYSELF HAD FLOWN INTO LAX MANY TIMES AND HAD DEVELOPED THE HABIT OF ALWAYS STAYING ABOVE (IN ALT) ANY HVY ACFT WE WERE FOLLOWING. WE WERE BOTH SURPRISED TO HIT WAKE TURB THAT FAR BEHIND A HVY. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THIS RPTR WAS FLYING A BEECH 1900D AND HE WAS BEHIND A B747. THE WX WAS VERY CLR AND CALM WITH VISIBILITY AROUND 100 MI AND NO WIND. HE THOUGHT THAT 6 MI WAS PLENTY OF DISTANCE BEHIND THE B747; BUT AS HE APCHED SMO AT 10000 FT HE SUDDENLY ROLLED TO THE R. THE FO (FLYING) PUT IN FULL L AILERON; BUT THE BANK ANGLE REACHED 60 DEGS ANYWAY. THEN THE ACFT ROLLED RAPIDLY TO THE L TO 45 DEGS AGAIN WITH THE FO ATTEMPTING TO STOP THE ROLL WITH FULL OPPOSITE AILERON. AFTER THIS; SEVERAL LESSER ROLLING MOMENTS WERE ENCOUNTERED. THE APCH CTLR WAS INFORMED. DURING THE APCH THE FLC STAYED HIGH ON THE GS AND AVOIDED FURTHER ENCOUNTERS.