ACR Y UNCOORD UNAUTH PENETRATION OF AIRSPACE. HAD LTSS FROM ACR X. SYS ERROR.

Narrative

I WAS WORKING MCO'S DEP RADAR E POS. AT THIS POS I OWN SURFACE TO 8000 FT. THE ARR CTLR OWNS 9000-12000 FT IN THIS SAME AREA. I WAS WORKING ACR X CLBING TO 8000 FT. DURING THIS PERIOD OF TIME I ALSO WAS MANUALLY COORDINATING AN OVERFLT WITH ZJX. MY ATTN FOR A FEW SECONDS WAS ON THE MANUAL HDOF. ALL OF A SUDDEN ASKED 'WHO IS THIS ACFT OFF MY NOSE' OR SOMETHING TO THAT EFFECT. I QUICKLY READ OUT THE ACFT WHICH AT THAT POINT WAS ALREADY PAST BUT IN MY AIRSPACE. I QUICKLY QUESTIONED THE OTHER CTLR AND IT WAS INDICATED TO ME THAT VISUAL SEPARATION WAS APPLIED. I TOLD ACR X THAT THE OTHER ACFT HAD HIM IN SIGHT AND HAD BEEN MAINTAINING VISUAL SEPARATION AND I COULD NOT CALL TFC BEFORE BECAUSE I HAD BEEN ON THE LANDLINE WITH JACKSONVILLE. THE OTHER ACFT INVOLVED WAS ACR Y INTO MCO. THE PROB WAS ACR Y HAD DSNDED INTO MY AIRSPACE WITHOUT COORD. I DO NOT KNOW FOR SURE IF IT WAS THE PLT'S ERROR OR THE OTHER CTLR'S ERROR. I HAD FULFILLED ALL MY RESPONSIBILITIES AND AT THIS TIME ONLY KNOW THAT VISUAL SEPARATION WAS APPLIED BY ACR Y.