AN EXPERIENCED PLT NEARLY COLLIDED WITH A RADIO TWR ON AN ILS APCH TO PDK.

Narrative

I THEN PROCEEDED TO PDK SINCE THAT ARPT HAS AN ILS AND ACFT WAS GETTING IN OK. SHORTLY AFTER PASSING MORROW INTXN; THE GS INDICATOR MOVED DOWN AND WHEN IT CTRED; I FOLLOWED THE GS. STUPIDLY; I DID NOT WAIT FOR THE MARKER LIGHT AT OM. RESULT; I WAS TOO LOW; TOO FAR OUT AND NEARLY COLLIDED WITH THE TWR'S UNDERLYING THE ILS. THIS PROB HAPPENED ONCE BEFORE IN MY AIRPLANE WHILE IN VISUAL CONDITIONS. THE RADIO SHOP CHKED MY GS EQUIP AND FOUND NO PROB; SO I ASSUMED THE PROB WAS WITH THE ACFT EQUIP AND TEST FLEW THE AIRPLANE AT MCN; GA; AFTER THIS INCIDENT AND THE EQUIP WORKED FINE. I KNOW THAT AFTER 43 YRS OF FLYING; THIS WAS THE CLOSEST I HAVE COME TO GETTING KILLED; WHERE I WAS IN CTL. I AM NOW RETIRED FROM A MAJOR AIRLINE AND WE ALWAYS HAD A PROC TO VERIFY THE ALTIMETERS AT THE OM. I ALWAYS THOUGHT THIS WAS TO VERIFY ALTIMETER ACCURACY; BUT NOW REALIZE; THAT WOULD ALSO VERIFY THAT THE GS IS WORKING PROPERLY. I LOST MY SITUATIONAL AWARENESS ON THIS APCH AND SHOULD HAVE USED THE DME INFO TO CONFIRM MY POS.