AN SF340 FO SETS UP THE TWR CTLR FOR A LOSS OF SEPARATION WITH A POTENTIAL CONFLICT WHEN HE FAILS TO TURN ONTO THE DOWNWIND LEG AFTER A GAR. CAPT WAS BUSY BRIEFING FLT ATTENDANT ABOUT THE GAR AT GSP; SC.

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THE FO WAS FLYING. HE WAS NEW TO THE COMPANY AND STILL ON HIGH MINIMUMS. HIS DSCNT INTO GSP WAS STARTED LATE AND RESULTED IN A GAR BECAUSE WE WERE TOO HIGH TO LAND. WE CLEANED THE ACFT UP AND WERE INSTRUCTED TO ENTER DOWNWIND. I THEN INFORMED THE FLT ATTENDANT OF OUR GAR. WHEN I WAS DONE TALKING TO HER ON THE INTERPHONE; THE FO WAS STILL ON XWIND; NEVER TURNED DOWNWIND AND STILL HDG AWAY FROM THE ARPT. THE TWR CALLED TFC FOR US AT 12 O'CLOCK; A CONFLICT HE WASN'T PLANNING ON; BECAUSE HAD WE TURNED DOWNWIND PROMPTLY; THE TFC WOULD HAVE BEEN IN BACK OF US AS TWR HAD ORIGINALLY PLANNED AFTER THE GAR. THIS CONFLICT UPSET THE CTLR AS WE COULD TELL BY HIS VOICE ON THE RADIO. WE TURNED DOWNWIND AND WERE HANDED OFF TO APCH AND RESEQUENCED FOR ANOTHER APCH. SEPARATION DURING THE INCIDENT WAS ADEQUATE 3-4 MI; BUT NONETHELESS SCARED THE CTLR. LESSON LEARNED: BEFORE BRIEFING THE FLT ATTENDANT; STABILIZE THE SIT (GAR); ASK IF THE FO HAS GOT EVERYTHING UNDER CTL; THEN WHEN HE IS COMFORTABLE; GO BRIEF THE FLT ATTENDANT. CONTRIBUTING FACTORS: NEW FO; LOW TIME; VERY LOW TIME IN ACFT. MOST LIKELY HIS FIRST REAL GAR IN THIS ACFT.