ZTL RADAR CTLR CONCERNED WITH NON COORD FLT PATH DEV OF GV FLC ON VISUAL APCH TO HKY ARPT. GV THEN OBSERVED MAKING ADDITIONAL TFC PATTERN DEV REQUIRING CTLR TO AMEND IFR CTL INSTRUCTIONS FOR AN INBOUND PATZ.

Narrative

THE GLF5 (ACFT X) WAS INBOUND HKY FROM THE N. TOLD TO EXPECT VISUAL RWY 24. THE PATZ (ACFT Y) WAS SHOOTING PRACTICE APCHS TO HKY IN VFR CONDITIONS. THE PATZ WAS ON A MISSED APCH 7-10 MI N OF THE ARPT. ACFT 1 WAS ISSUED THE PATZ AS TFC AND ANOTHER UNKNOWN VFR ON THE FINAL TO HKY INDICTING 2900 FT. THE GLF5; WITHOUT ADVISING AND WITHOUT CLRNC; WAS PROCEEDING TO TAWBA; THE NDB OM FOR HKY. THE GLF5 ALSO ADVISED HE WAS 'PAINTING' BOTH VFR'S. THE GLF5 TURNED HIMSELF ONTO THE LOC (AGAIN WITHOUT ADVISING OR A CLRNC) RIGHT ON TOP OF THE UNKNOWN VFR. THE GLF5 FINALLY PICKED UP THE ARPT ON A 5 MI FINAL. CLRED FOR VISUAL; TERMINATED AND SWITCHED TO THE TWR. THE PATZ CALLED AND SAID HE HAD RUN INTO A SNOW SHOWER. HE ASKED FOR AN IFR CLRNC. I CLRED HIM DIRECT TAWBA AT 3400 FT. 3400 FT IS THE MIA. THE GLF5 MADE A 360 DEG TURN ON A 1 MI FINAL. HE WAS AT 2400 FT SO I LET THE PATZ CONTINUE TO TAWBA. THE GLF5 EXTENDED; TRYING TO GET BEHIND THE OTHER VFR AND ROSE TO 2600 FT WHILE TURNING BASE. I TURNED THE PATZ TO A 090 DEG HDG AND CLBED HIM TO 4000 FT. I DIDN'T MEASURE THE DISTANCE BUT IT WAS RIGHT AT 5 MI. THIS IS THE THIRD TIME I'VE SEEN AN ACFT USE TCASII TO TRY TO RUN A VFR OFF THE FINAL. IT'S DANGEROUS AND SHOULD STOP. I FEEL TOTALLY DISCONNECTED FROM THE WX SINCE ASOS AND AWOS BEGAN. I WAS COMPLETELY SURPRISED BY THE VISUAL AND THE SNOW SHOWERS. I HAVE NO IDEA IF THIS COULD HAVE BEEN/WAS AN OPERROR; A PLTDEV OR NONE OF THE ABOVE. I THINK A LITTLE TRAINING IS CALLED FOR. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR EXPRESSED CONCERN WITH WHAT HE PERCEIVES AS A MORE AGGRESSIVE USE OF TCASII BY PLTS. HE STATES THAT WHEN THE PLT WAS ISSUED TFC AND COULD NOT SEE THE TFC; PRE TCAS; THE PLT WAS 'MORE CAUTIOUS' ABOUT THE TFC CALL UNTIL TFC WAS IN SIGHT. THE RPTR HAS RECENTLY PERCEIVED THAT TCASII EQUIPPED ACFT WILL NOW 'RUN UP' CLOSER TO THE TFC BEFORE TAKING WHATEVER ACTION IS 'NECESSARY' FOR THE SIT. THIS 'MORE BOLD' NATURE CAUSES HIM OVERALL CONCERN. THE RPTR STATES THAT ASOS WX CHANGES DO NOT 'ALARM' IN THE CTL AREAS; THUS NOT ALERTING THE CTLR TO CHANGES WHICH MIGHT AFFECT TFC SEQUENCING AND TWR COORD.