CMH ARTS RADAR AUTOMATION PROB.

Narrative

YESTERDAY AND TODAY; I HAD SAME OCCURRENCE. YESTERDAY; HDOF TO ME AT S RADAR FROM ZID. FULL DATA BLOCK DID NOT APPEAR UNTIL ACFT ON MUTUAL BOUNDARY. BEFORE THAT; THERE WAS NOT EVEN A LIMITED DATA BLOCK NOR EVEN A 'SPLAT' SYMBOL. THERE WAS ONLY A PRIMARY AND BEACON TARGET. NO MODE C ALT. NOTHING! HOWEVER; THE TARGET AND FULL DATA BLOCK/LIMITED DATA BLOCK APPEARED JUST FINE ON UNUSED SCOPE! TODAY; I WAS WORKING N RADAR AND FINAL RADAR WAS NOT TAKING HDOF. SAME PROB! IN BOTH INSTANCES; CHANGING THE RANGE SETTING CLRED UP THE PROB. AIRWAYS FACILITIES ADVISED. THIS IS EXTREMELY SERIOUS SIT. SOMETHING IS NOT RIGHT WITH THE ARTS. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR ADVISED INCIDENT TOOK PLACE IN A COMMON HDOF AREA WITH ZID; NIKLS INTXN; ACFT WAS DSNDING TO 11000 FT. NIKLS IS APPROX 40 MI FROM THE RADAR MAIN BANG. MAINT APPARENTLY RESOLVED THE PROB SHORTLY AFTER BEING NOTIFIED OF THE INCIDENT; BECAUSE THE FOLLOWING DAY; AND THEREAFTER; THE CONDITION DID NOT RECUR. CTLR STATES THAT HE NEVER RECEIVED A REASON OR THE RESOLUTION TO THE OCCURRENCE.