CAPT OF LTT ON APCH TO MIA EXPERIENCED WAKE TURB FROM A PROCEEDING MLG ACR. RPTR STATES THAT APCH CTL TOO OFTEN DSNDS FLTS FROM ABOVE THE TURBOPROP RTES INTO IT.

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WHILE IN CONTACT WITH MIA APCH CTL; ON ASSIGNED HEADING; WE OBSERVED AN ACFT ON OUR TCASII THAT APPEARED IN FRONT OF US. AS WE OBSERVED THAT ACFT DSND ON OUR TCASII; WE ENCOUNTERED MODERATE ROLL FROM THAT ACFT AND INITIATED RECOVERY. OUR FLT ATTENDANT RPTED THAT THE ROLL CAUSED HER TO LOSE BAL; AND FALL INTO A PAX SEAT ARMREST. SHE SAID SHE WAS OK TO CONTINUE THE TRIP. APCH CTL AT MIA ROUTINELY SLOWS PROPJETS ON LONG FINAL; THEN DROPS JET ACFT IN FRONT OF US; SO THAT THEY DSND THROUGH OUR ALT; SEPARATION IS OFTEN THE FAA RECOMMENDED MINIMUM. STAYING ABOVE GS; AND WATCHING THE OTHER ACFT ON TCASII PREVENTS UPSET MOST OF THE TIME. WAKE AVOIDANCE IS NOT ALWAYS POSSIBLE. OCCURRENCE OF THIS TYPE IS ALL TOO COMMON AT MIA. WHEN ON A NON PRECISION APCH; WHERE WE DO NOT HAVE GS INFO; THE PROB BECOMES EVEN MORE OF A CONCERN. APCH CTL CALLS IT COMPRESSION. IT IS A MAJOR ACCIDENT WAITING TO HAPPEN. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR PARTICIPATED IN THE WAKE TURB CALLBACK; SEE SEPARATE RPT.