ACR X DSCNT TO OCCUPIED ALT HAD LTSS FROM SMT Y. SYS ERROR.

Narrative

I WAS WORKING GSP E AND S RADAR POSITIONS COMBINED AND WITH A TRAINEE. ACR X WAS WBOUND LNDG FROM CLT AT 10000 FT. SMA Y (C210) WAS SEBOUND ON V53 FROM SPA TO BURBA INTXN AT 9000 FT. THE WATCH SUPVR; WORKING FLT DATA; ANSWERED THE CLT VOICE LINE AND APPROVED X DSNDING TO 9000 FT. HE ADVISED THE TRAINEE OF THIS; BUT DID NOT TELL ME. THE TRAINEE DID NOT NOTICE THE DEVELOPING CONFLICT AND; AS FAR AS I KNEW; X WAS GOING TO BE AT 10000 FT PER OUR PROCS. BY THE TIME I NOTICED X HAD DSNDED TO 9000 FT; HE WAS ALREADY IN CONFLICT WITH Y. I TOOK OVER THE POS FROM THE TRAINEE AND TOLD X TO 'TURN L HDG 180 DEGS IMMEDIATELY FOR TFC.' THE TURN ALONE RESOLVED THE CONFLICT; BUT RESULTED IN LESS THAN THE REQUIRED 3 NM SEPARATION. I THEN DSNDED X AND TURNED HIM BACK TO THE W WHEN HE WAS THROUGH 8000 FT. THE MAIN CAUSE OF THIS PROB WAS THE SUPVR'S FAILURE TO INFORM ME; THE PERSON RESPONSIBLE FOR THE POS; OF COORD HE HAD PERFORMED AFFECTING THE SEPARATION OF MY TFC. ALSO; IF HE HAD APPROVED AN ALT APPROPRIATE FOR DIRECTION; IE; 8000 FT WBOUND THIS MAY HAVE NEVER HAPPENED. THERE WAS ALSO NO REASON FOR HIM TO GET ON THE COORD LINE TO START WITH; WE HAD THINGS UNDER CTL; AND WERE NOT THAT BUSY. THE FLT DATA POS HAS NO CTL AUTH/RESPONSIBILITY ANYWAY. X WAS EQUIPPED WITH TCASII; BUT AS FAR AS I KNOW; NO RA WAS GIVEN BY TCASII.