CAPT OF TURBOPROP COMMUTER AIRLINE RPTS A WAKE TURB ENCOUNTER WHILE ON APCH TO MIA. FLC WAS SEQUENCED BEHIND A B747; BUT WAS NOT GIVEN A WAKE TURB ADVISORY. ATC CLAIMS THAT LEGAL 5 MI SEPARATION WAS PROVIDED. ONE INJURY OCCURRED TO THE FLT ATTENDANT.

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ENRTE EYW TO MIA AT 4000 FT ON A 060 DEG HDG; MAINTAIN 210 KTS TO INTERCEPT THE LOC TO RWY 9R IN MIA; THEN DOWN TO 3000 FT UNTIL FAF AND CLRED FOR ILS TO RWY 9R. AT APPROX 3000 FT AND GS INTERCEPT; WE ENCOUNTERED WAKE TURB. AFTER EXITING WAKE TURB I CALLED THE FLT ATTENDANT TO MAKE SURE THAT EVERYONE WAS OK. THE PAX WERE OK; BUT THE FLT ATTENDANT HAD HURT HER LEG. WE ASKED ATC IF HE HAD TFC AHEAD OF US AND HE SAID THAT WE WERE FOLLOWING A B747. (WE WERE NOT PREVIOUSLY TOLD OF SUCH TFC OR OF POSSIBLE WAKE TURB.) AFTER LNDG I PHONED ATC AND SPOKE WITH A SUPVR. HE SAID THAT HE HAD LISTENED TO THE TAPES AND CONFIRMED THAT WE WERE NOT GIVEN TA OR POSSIBLE WAKE TURB ADVISORY. HE SAID THAT THEY PUT THE B747 AHEAD OF US AND THAT THEY HAD THE LEGAL 5 MI SEPARATION WHICH IS ALL THAT IS REQUIRED. HE ALSO SAID THAT THE LACK OF A WAKE TURB CALL WAS NOT PRUDENT AND THAT HE WOULD SPEAK TO THE CTLR INVOLVED ABOUT IT. WE GOT OUR FLT ATTENDANT SOME MEDICAL ATTN AND CONTINUED WITH A DIFFERENT FLT ATTENDANT. I BELIEVE THAT THE B747 WAS PUT IN FRONT OF US AND ABOVE US (WHICH SEEMS TO BE A COMMON PRACTICE IN MIA) AND WE HIT IT AS IT DSNDED THROUGH OUR ALT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR WAS CONTACTED TO PARTICIPATE IN THE STRUCTURED WAKE TURB CALLBACK. CALLBACK CONVERSATION WITH RPTR ACN 353957 REVEALED THE FOLLOWING INFO: THE RPTR WAS FLYING A DASH 8-200 WHEN HE HIT THE WAKE OF A B747-100F. THE EFFECT WAS AS THOUGH SOMEONE WAS SHAKING A SHEET WHEN MAKING A BED OR A FLAG IN A STRONG BREEZE HE SAID. THE ACFT BOUNCED UP AND DOWN TWICE; VERY QUICKLY; AND THEN RETURNED TO NORMAL OP. THE ACFT REMAINED ON THE AUTOPLT AND THE ENCOUNTER WAS SO BRIEF; THOUGH VIOLENT; THAT HE THOUGHT THAT EVERYTHING WAS OK WITH THE ACFT AND PAX. HOWEVER; A PAX CALLED THE FLT CREW ON THE INTERPHONE AND TOLD THEM OF THE FLT ATTENDANT'S INJURY AND THAT SHE WAS NOW STRAPPED IN. THE CAPT CALLED THE APCH CTLR AND REPORTED THE INCIDENT AND THE CTLR SAID THAT A B747-100F WAS ABOUT 5 MI AHEAD FOR THE SAME RWY. THIS SAME ACFT HAD BEEN SEEN BY THE FLT CREW EARLIER WHEN THEY WERE AHEAD OF IT IN THE ARR PATTERN; BUT THEY HAD BEEN VECTORED ON AN EXTENDED DOWNWIND LEG AND THE B747 WAS TURNED IN FRONT OF THEM.