ATR72 LEVEL AT 11000 WITH ZTL ARTCC RPTED CONFLICTING VFR C182.

Narrative

WE WERE AT LEVEL CRUISE AT 11000 FT ABOUT 10 NM N OF RMG VOR; HEADING S ON A FLT FROM CHA TO ATL. I WAS GIVING INSTRUCTION TO A NEW CAPT; SO I WAS IN THE R SEAT; BUT WAS PIC. I WAS DOING SOME PAPERWORK WHEN I LOOKED L AND SAW A BLUE AND WHITE CESSNA 182 AT OUR 10 O'CLOCK POS AND PROBABLY LESS THAN 500 FT HORIZ SEPARATION AND ZERO FT VERT. THE CESSNA APPEARED TO BE HEADING TOWARD THE SW; AND WE WERE HEADING S. I TURNED OFF THE AUTOPLT AND TURNED TO THE R TO MISS THE ACFT. WE ESTIMATED THAT WE MISSED THE ACFT BY ABOUT 200 FT. WE THEN CALLED CTR AND ADVISED THEM OF THE CONFLICT; AND THEY SAID THAT THEY SHOWED NO TFC. WE WERE TCASII EQUIPPED; AND OUR TCASII NEVER SHOWED THE ACFT EITHER. AFTER LNDG IN ATL; WE CALLED ATL CTR AND TALKED WITH A SUPVR. HE INFORMED US THAT HE WAS STANDING BEHIND THE CTLR WHEN THE NEAR MISS OCCURRED; AND VERIFIED THAT NO TFC WAS SHOWING UNTIL AFTER WE RPTED THE CONFLICT; THEN THEY SHOWED UP AND THE PLT OF THE CESSNA CALLED FOR FLT FOLLOWING. THE CTLR ALSO SAID THEY MENTIONED TO THE CESSNA THE DANGERS OF FLYING 50 MI OUTSIDE ONE OF THE BUSIEST ARPTS IN THE WORLD AT 11000 FT WITHOUT A XPONDER ON AND WITHOUT TALKING WITH ANYONE.