MLG LINES UP WITH WRONG RWY ON APCH.

Narrative

FIRST I PICKED UP THE ATIS AND WROTE DOWN 27L AS THE LNDG RWY. THEN AS WE SPOKE TO APCH AND THEY POINTED OUT TFC AND WE SAID YES; WE HAVE HIM IN VISUAL CONTACT; THEY THEN CLRED US FOR WHAT WE THOUGHT WAS RWY 27R; WHICH WAS THE STANDARD RWY FOR LNDG AT THIS ARPT; NOT RWY 27L WHICH THE ATIS SAID. THEN AT ABOUT 200 FT AND GETTING SET TO LAND ON THE WRONG RWY (27R) THE TWR SAID TO GAR. AT THAT POINT WE WENT AROUND. THE RWY WAS CLR AND NO OTHER TFC IN THE AREA. I GUESS WHAT HAPPENED WAS THAT WE WERE SO USED TO LNDG ON ONE RWY AND NOT REALLY LISTENING TO WHAT WAS BEING SAID BUT WHAT WE WANTED TO HEAR. I FEEL THAT WHEN A CHANGE FROM THE STANDARD IS IN USE THAT ALL INVOLVED SHOULD DOUBLE-CHK THAT THIS CHANGE FROM NORMAL IS CLRLY UNDERSTOOD AND BEING FOLLOWED AND NOT WAITING UNTIL 200 FT BEFORE LNDG. SUPPLEMENTAL INFORMATION FROM ACN 265309: THE SIT COULD HAVE BEEN CORRECTED PRIOR TO THE GAR. EITHER PLT SHOULD HAVE CHKED THE CDI; BUT BECAUSE THE WX WAS SO GOOD; WE JUST LINED UP VISUALLY AND FLEW THE GS. KPHL IS THE ONLY ARPT I CAN RECALL WITHOUT DIGGING THROUGH MY APCH PLATES THAT HAS THE SAME FREQ FOR PARALLEL RWYS. THE IDENTS ARE DIFFERENT; BUT BOTH FREQ AND INBOUND COURSE ARE IDENTICAL. IF THE FREQS WERE DIFFERENT; MAYBE WE WOULD HAVE CAUGHT OUR ERROR SOONER.