DASH 8 CREW FLEW THROUGH LOC ON APCH TO CLT DUE TFC DISTRS. NO CONFLICTS. NEW RWY AND LNDG CLRNC GIVEN.

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ON ARR INTO CLT ARPT AT APPROX XA30; WE WERE CLRED BY APCH CTL FOR A VISUAL APCH TO RWY 23 TO FOLLOW ANOTHER ACFT WHICH WAS AT OUR 10:30-11 O'CLOCK POS. WE WERE THEN CLRED TO TWR FREQ. THE FO WAS FLYING THE ACFT. I WAS THE PNF. I CONTACTED THE TWR BEFORE THE ACFT ALIGNED WITH THE RWY CTRLINE OR LOC. WE WERE ON A MODIFIED L BASE WITH APPROX 45-50 DEG HDG FROM THE FINAL APCH COURSE. BEFORE REACHING THE RWY EXTENDED LINE; I SPOTTED ANOTHER ACFT'S LIGHTS WHICH APPEARED TO BE ON A R BASE LEG TO RWY 23. I DIVERTED MY ATTN TO THIS ACFT WHICH WAS ACTUALLY ON FINAL APCH TO RWY 18L ON A CONVERGING APCH. I DID NOT NOTICE WHEN THE ACFT CROSSED THROUGH THE RWY CTRLINE AND LOC UNTIL THE TWR BROUGHT THE SIT TO MY ATTN. THE TWR OFFERED US A VISUAL APCH AND LNDG CLRNC TO RWY 18L. WE WERE IN GOOD POS FOR THE APCH AND ACCEPTED THE LNDG CLRNC ON RWY 18L. THERE WAS NO CONFLICT WITH OTHER ACFT; BUT THERE COULD HAVE BEEN. THE CLOSEST TCASII CONTACT WAS OVER 2 MI AWAY. I FEEL THAT THERE WERE 2 FACTORS INVOLVED IN THIS DEV. 1) THE FO HAD VERY LITTLE EXPERIENCE IN MULTI ENG; INST; TRANSPORT OPS. HE HAD APPROX 300 HRS IN MULTI ENG ACFT AND WAS ONLY RECENTLY CHKED OUT IN THE DASH 8. TRAINING CONCENTRATED ON COMPANY PROCS AND EMER PROCS. I FAILED TO RECOGNIZE THIS AT THE TIME. 2) I WAS TIRED. IT HAD BEEN 11 HRS SINCE I HAD LEFT HOME. WE NEED NEW CREW REST REGS WHICH CONSIDER VARIED RPT TIMES AND CYCLES PLUS REASONABLE DUTY TIMES.