A80 CTLR EXPERIENCED OPERROR AT APPROX 3500 WITH TWO ACFT BEING VECTORED TO FINAL; APPLIED VISUAL SEPARATION; BUT NOT IN TIME.

Narrative

WHILE WORKING FINAL I HAD 2 ACFT ON PARALLEL BASES. I ISSUED TFC TO THE (B757) ONE CLOSEST TO THE ARPT WHEN I NOTICED THAT I HAD 2 ADDITIONAL ACFT; ONE ON DOWNWIND AND ONE ON WIDE BASE DSNDING TO THE SAME ALT ON A COLLISION COURSE. I ASKED THE CTLR THAT WAS STILL WORKING THE ACFT ON DOWNWIND TO DSND THAT ACFT TO A LOWER ALT TO ALLEVIATE THE CONFLICTION. I THEN TURNED THE ACFT (B737) APCHING THE FINAL AND FURTHEST FROM THE ARPT ONTO THE LOC. THEN I QUERIED THE OTHER ACFT (B757) IF HE HAD STARTED HIS TURN TO JOIN THE LOC. HE SAID THAT HE HAD NOT; BUT HE WOULD START IT NOW. I ASKED THE SECOND ACFT (B737) IF HE HAD THE FIRST ONE (B757) IN SIGHT. HE RESPONDED THAT HE HAD A COLORED FIGURE. I ASKED HIM AGAIN IF HE HAD THE TFC IN SIGHT. HE SAID YES AND I INSTRUCTED HIM TO MAINTAIN VISUAL SEPARATION FROM THE TFC. THE SUPVR HAD ME RELIEVED; SO THAT THE TAPES COULD BE REVIEWED FOR A POSSIBLE ERROR. THE OPERATIONAL MGR REVIEWED THE AUDIO AND VIDEO PLAYBACK AND THOUGHT THAT IT WAS ERROR-FREE. ONLY AFTER FURTHER REVIEW OF THE DATA EXTRACTION WERE WE ABLE TO SEE THAT I LOST DIVERGENCE SEPARATION A FEW SECONDS PRIOR TO OBTAINING VISUAL SEPARATION. I AM ULTIMATELY RESPONSIBLE FOR THE POS I AM WORKING; I ALSO KNOW THAT WORKING SCHEDULED OVERTIME IS A CONTRIBUTING FACTOR TO MY FATIGUE.