FLC MAKES CAT II APCH WITH INOP TOUCHDOWN RVR. MID AND ROLLOUT RVR WERE AVAILABLE.

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PRIOR TO APCH AT CHS; ATIS DESCRIBED CAT II APCHS TO RWY 15. PRIOR TO FINAL APCH FIX; APCH CTL GAVE RVR'S AS MID 1600 FT ROLLOUT 1800 FT. WHEN WE QUERIED THE TOUCHDOWN RVR; HE SAID HE WASN'T SURE IT WAS WORKING AT THE TIME; IT WAS READING ZERO; BUT THE LAST 2 ACFT LANDED OK AND THE VISIBILITY HAD NOT CHANGED. WE HURRIEDLY CHKED OPS SPECS AND CONCLUDED THAT WE WERE LEGAL TO SUBSTITUTE MID OR ROLLOUT RVR FOR TOUCHDOWN RVR. AFTER LNDG; WITH FURTHER RESEARCH; WE CONCLUDED THAT WE MAY HAVE NOT BEEN LEGAL TO CONDUCT A CAT II APCH WITH NO TOUCHDOWN RVR BEING RPTED. CONFUSION EXISTED IN THE SHORT TIME WE HAD TO MAKE A DECISION; SINCE APCH CTL NEVER RPTED THE TOUCHDOWN RVR AS INOP; AND THE VISIBILITY WAS AS GOOD OR BETTER SINCE THE 2 PREVIOUS ACFT LANDED. THIS SIT COULD HAVE BEEN AVOIDED IF: 1) THE ATIS HAD RPTED THAT TOUCHDOWN RVR WAS INOP. SUFFICIENT TIME WOULD HAVE EXISTED TO RESEARCH THE SIT. 2) WE HAD GONE INTO A HOLDING PATTERN AT THE FAF AND FURTHER QUERIED THE CTLR AS TO THE EXACT STATUS OF THE TOUCHDOWN RVR. 3) EACH CAT II AND CAT III APCH PLATE HAD A PRINTOUT OF WHICH RVR IS REQUIRED AND CTLS; RATHER THAN HAVING TO HURRIEDLY GET THE OPS SPECS OUT TO CHK IT.