FLC OF AN LTT CLBED ABOVE ASSIGNED ALT IN RESPONSE TO A TCASII RA. NMAC.

Narrative

WHILE FLYING FROM CAK TO CVG AT 10000 FT MSL ON V-5; 95 DME FROM CVG; OUR TCASII GAVE US A VERBAL 'TFC; TFC' AND SHORTLY THEREAFTER VERBALLY CALLED 'CLB; CLB.' WE SMOOTHLY PULLED-UP AND THE TARGET PASSED UNDERNEATH US. WE CLBED APPROX 900-1000 FT AND IMMEDIATELY DSNDED BACK TO 10000 FT. THE 'TARGET' INDICATED 'MINUS 200' IN OUR 12 O'CLOCK POS AND CLOSING ON US RAPIDLY AS WE BEGAN THE MANEUVERS AND DISAPPEARED FROM THE TCASII AS WE CAME BACK TO OUR ASSIGNED ALT. WE INFORMED ATC OF OUR DEV. THE CTLR ACKNOWLEDGED; BUT SAID NOTHING ELSE. WHY DIDN'T THE CTLR ADVISE OF THE TFC BEFORE IT BECAME A POTENTIAL PROB? HE WAS BUSY ON FREQ; BUT DOES HE HAVE PRIORITIES? WAS HE OVERLOADED? TIRED? DID HE HAVE RADAR THAT WARNS OF IMPENDING CONFLICT? WAS IT WORKING? IT SHOULD BE NOTED THAT WE WERE BTWN LAYERS OF CLOUDS AND NEVER DID GET A VISUAL CONTACT ON THE OTHER ACFT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THAT HE DID NOT REALIZE THAT VFR ACFT SQUAWKING 1200 MAY NOT HAVE AN ALT READOUT FOR ATC; THEREFORE; ATC DOES NOT FURNISH ADVISORIES FOR THE NUMEROUS TARGETS IN A BUSY TERMINAL AREA THAT MAY BE AT A LOWER ALT CAUSING NO TFC CONFLICT TO HIGHER ACFT. TCASII IN THIS INCIDENT WAS MOST USEFUL IN AVOIDING A COLLISION. THE RPTR WAS OPERATING A SAAB SF340B.