CTLR RPT OF AIR TAXI FLT WHICH DRIFTED SW OF VOR APCH COURSE AND ENCOUNTERED ANTENNAS 50 FT LOWER THAN HIS ALT. CLBED AND VECTORED AWAY; OFFERED LOC BACK COURSE APCH. FLIES THROUGH THE LOC. APCH OFFERS ASR APCH. ACCEPTED. LANDS.

Narrative

I WAS WORKING THE RADAR E POS WHEN A SMA CALL SIGN XX WAS HANDED OFF FROM ZHU BUNKI SECTOR. THE ACFT CHKED IN AT 5000. THE ACFT WAS INSTRUCTED TO PROCEED DIRECT THE BTR VOR. 15 MI NW OF THE VOR; ACFT WAS INSTRUCTED TO FLY HDG 150 DEGS; DSND AND MAINTAIN 1800 FT. AT 5 MI FROM THE VOR THE ACFT WAS CLRED FOR THE VOR RWY 4L APCH. NO RESPONSE. I KEPT TRYING TO CONTACT SAID ACFT. I TRIED THE BACK UP XMITTER AND HAD OTHER ACFT ATTEMPT CONTACT TO NO AVAIL. ACFT TRAVELED 20 MI AND FLEW R OVER A 1750 FT ANTENNA LOCATED 15 MI SW OF BATON ROUGE. THE PLT FINALLY KEYED UP TWR FREQ AND SAID 'WOW; THESE ARE BIG TWRS.' THE LCL CTLR ASKED WHO HAD SAID THAT AND XX RESPONDED. THE LCL CTLR TURNED THE ACFT AWAY FROM THE ANTENNAS AND CLBED THE SMA TO 3000 FT THEN SWITCHED HIM BACK TO ME. WHEN THE SMA CHKED BACK ON; I ASKED IF HE HAD THE APCH PLATES UP FOR THE LOC BACK COURSE RWY 4L APCH. HE RESPONDED HE DID. ACFT WAS THEN CLRED FOR THE LOC BACK COURSE 4L APCH AT 5 MI FROM THE FINAL APCH FIX. THE ACFT THEN FLEW THROUGH THE LOC. I ASKED IF HE HAD THE LOC TUNED IN; HE SAID NO; HE THOUGHT IT WAS A VOR APCH. THE ACFT WAS THEN 6 MI FROM THE ARPT AND I ASKED IF HE WANTED TO BE VECTORED BACK OUT OR IF HE WANTED AN ASR APCH. THE PLT SAID HE WANTED THE ASR SO I GAVE HIM THE APCH AND HE LANDED WITHOUT FURTHER INCIDENT. THE BATON ROUGE TRACON IS EQUIPPED WITH ARTS IIA WHICH HAS MSA WARNING. IN THIS INCIDENT; THE MSAW DID NOT GO OFF EVEN THOUGH THE ACFT WENT WITHIN 50 FT RIGHT OVER THE TOP OF THE ANTENNA. THE MAJOR CONCERN IN THIS INCIDENT IS THAT THE ACFT TRAVELED MORE THAN 20 MI BEYOND THE FINAL APCH COURSE AND INTO THE ANTENNAS. I THINK THE PLT WAS INATTENTIVE AND WAS EXTREMELY LUCKY THIS TIME. I THINK AIR TAXI OPERATORS AND ALL PLTS SHOULD MAINTAIN GOOD LISTENING HABITS ON THE RADIO. ESPECIALLY WHEN THEY ARE IN A TERMINAL ENVIRONMENT. BOTH OF THESE PROBLEMS ARE MAJOR AND NEED TO BE ADDRESSED THROUGHOUT THE SYS. ENCLOSED IS A BTR RADAR MAP OF ACFT TRACK.