SMT LANDS ON CLOSED PORTION OF RWY.

Narrative

I WAS THE PIC OF AN SMT LIGHT TWIN ENG ACFT. I WAS ON AN IFR FLT PLAN FROM PDK TO TYS. I GOT THE ATIS INFO WHICH ADVISED ME OF THE CURRENT NOTAM IN EFFECT STATING THAT THE LAST 4900 FT WAS AVAILABLE. I MADE A NORMAL VISUAL APCH FOR LNDG ON RWY 5R. I THOUGHT ABOUT ASKING FOR RWY 5L; BUT DECIDED NOT TO SINCE I HAD PLENTY OF RWY ON 5R. ON FINAL APPROX 1 MI OUT AND 1000 FT AGL; I STARTED LOOKING FOR THE DISPLACED THRESHOLD. THE ENTIRE RWY WAS PAVED; PAINTED; AND APPEARED TO BE OPERATIONAL. I WAS CLRED TO LAND BY TWR; BUT I WAS NOT REMINDED OF WHERE THE DISPLACED THRESHOLD WAS. I ASSUMED THE AREA CLOSED WAS THE UNPAVED AREA BEFORE RWY 5R. ON SHORT FINAL; I NOTICED A TRUCK LOCATED OFF THE RWY BEFORE THE THRESHOLD. I CROSSED THE THRESHOLD 150-200 FT AGL AND CONTINUED TO MAKE A NORMAL LNDG KNOWING I WAS WELL CLR OF THE TRUCK. LNDG AND ROLLOUT WAS NORMAL. I REALIZED WE WERE ON THE UNUSABLE RWY WHEN I ROLLED UP TO A ROPE BARRICADE AND NOTICED AN 'X' ON THE RWY. TWR ADVISED ME ON TAXI INSTRUCTIONS IN ORDER TO GET PAST THE BARRICADE. FACTORS CONTRIBUTING TO THE RWY INCURSION: I SHOULD HAVE MARKED THE UNUSABLE RWY ON MY ARPT DIAGRAM WHEN I GOT THE ATIS; TWR DID NOT REMIND ME OF THE DISPLACED THRESHOLD LOCATION. THE 'X' BLENDED IN WITH THE RWY ENVIRONMENT AND WAS NOT SEEN ON FINAL. I TALKED WITH THE TWR SUPERVISOR AFTER THE INCURSION. HE SAID SIMILAR INCURSIONS HAVE RESULTED SINCE THE RWY WAS PAINTED; AND THAT NO VIOLATION WOULD BE REQUIRED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO. RPTR STATES HE MADE THE ERROR THINKING LAST 5000 FT CLOSED; NOT FIRST PORTION. KNOWS NOT TWR RESPONSIBILITY BUT A REMINDER WOULD HAVE BEEN HELPFUL. THERE WAS NO ONE ON THE RWY AT THE TIME OF LNDG TO INDICATE WORK BEING PERFORMED.