A C182 CONDUCTING INFLT ILS GS MAINT TROUBLESHOOTING; HAD NMAC WITH A PIPER ARROW ON THE SAME GS.

Narrative

WE WERE CHKING FOR A BUZZING SOUND THAT MAINT WAS NOT ABLE TO FIND. IT WAS FOUND (BELIEVED TO BE RIGGING PROB IN COWL FLAP) AND CONDITIONS TO DUPLICATE WERE DOCUMENTED. THERE HAD ALSO BEEN A RPT THAT THE GS WAS INOP IN THE ACFT. WHEN WE FINISHED DOCUMENTING THE BUZZING SOUND; WE WERE ABOUT 3 NM NE OF CATCH. WE DECIDED TO CHK TO SEE IF WE COULD RECEIVE THE GS AND GET A DETERMINATION. WE INTERCEPTED THE LOC BUT GOT NO NEEDLE MOVEMENT WE WERE UNDERNEATH THE GLIDE PATH AND MAINTAINED ALT TO SEE IF IT WOULD COME IN. JUST AS WE WERE COMING OVER CATCH; I SAW THE OTHER ACFT DSNDING AND APPEARING TO SLOW. I HAD BEEN MONITORING APCH FREQ AND JVY CTAF BUT HAD HEARD NOTHING IN OUR AREA. AFTER I MANEUVERED DOWN AND TO THE L; THE OTHER ACFT CALLED 'OVER CATCH INBOUND ON THE ILS RWY 18 CLARK COUNTY.' I CALLED AND SAID WE WERE OVER CATCH ALSO AND THAT WE HAD HAD AN NMAC. HE CALLED BACK 'SORRY' AND CONTINUED ON. I THEN REALIZED THAT I WAS BROADCASTING ON LOUISVILLE APCH BUT WAS LISTENING TO HIM ON CTAF. IN THE FUTURE; FOR HIGHER SAFETY; I WILL GET FLT FOLLOWING FOR ANY TIME I AM IN THE VICINITY OF AN APCH. THIS SHOULD HELP WITH THE TFC AND WITH HELPING TO MAKE SURE I'M ON THE RIGHT FREQ. I HAD FELT THAT JUST MONITORING APCH WOULD HELP ME TO AVOID OTHER ACFT IN BUSY AIRSPACE. IT NEVER OCCURRED TO ME WHAT THE CONSEQUENCES OF ANOTHER ACFT DOING THE SAME THING WERE. THE NMAC WAS A CLASSIC LOW WING DSNDING ONTO A HIGH WING.