AN ACR MLG CREW LANDED IN A RPTED FREEZING RAIN SIT.

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WE WERE ON APCH TO CLT. WE WERE CLRED FOR APCH ON RWY 36L. THE ATIS RPTED LIGHT FREEZING RAIN; TEMP 32 DEGS F. WHILE ON THE APCH; THE TWR SAID THE NEW ATIS. FREEZING RAIN AND THE TEMP 32 DEGS F. THERE WAS NO ICING IN THE CLOUDS AND NO RPTS OF FREEZING RAIN STICKING TO GND. BRAKING ACTION WAS RPTED AS GOOD. WE LANDED WITH NO SIGN OF FREEZING RAIN. ON THE GND WE TALKED (THE CAPT AND I) OVER THE APCH. WE KNEW WE COULD NOT LAND IN MODERATE FREEZING RAIN; BUT DID NOT REALIZE THAT WHEN THE ATIS RPTS FREEZING RAIN IT'S THE SAME AS RPTING MODERATE FREEZING RAIN. SO EVEN THOUGH NO ICING CONDITIONS ACTUALLY EXISTED; WE LANDED IN WHAT WAS RPTED AS MODERATE FREEZING RAIN. THE TERMINOLOGY MUST BE CHANGED TO LIGHT FREEZING RAIN; MODERATE OR HVY FREEZING RAIN. ALSO; PLTS SHOULD BE GIVEN THE OPTION TO CONTINUE IF THE RPTED CONDITION DOES NOT EXIST. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR IS NOW AWARE OF THE PROVISIONS OF FAR 121.629(A) WHICH ALLOWS FLC TO CONTINUE FLT WHEN ICING CONDITIONS ARE MET AS LONG AS THE CAPT DETERMINES THAT THERE WILL BE NO ADVERSE SAFETY EFFECTS. THE RPTR'S FLT MANUAL CONFUSES THIS SIT BY MENTIONING ONLY MODERATE OR HVY FREEZING RAIN OR HVY FREEZING DRIZZLE. LIGHT OR FREEZING CONDITIONS LESS THAN MODERATE FREEZING RAIN OR HVY FREEZING DRIZZLE ARE NOT ADDRESSED. THE RPTR STILL IS UNCLR IN HIS MIND IF 'FREEZING RAIN' IS THE SAME AS 'MODERATE FREEZING RAIN.'