A LOW TIME C172 PLT ON A XCOUNTRY FLT; LANDED AT THE WRONG ARPT (MGM); IN THE WRONG DIRECTION; WITHOUT PERMISSION.

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I DEPARTED AMERICUS; GA (ACJ) ENRTE TO PRN IN GREENVILLE; AL. AS I WAS HEADED W INTO THE SUN; THE SMOKE WAS TREMENDOUS FROM ALL THE FOREST FIRES AND THE SUN GLARING THROUGH THE SMOKE. MY FLT PLAN PUT ME INTO EUFAULA; AL; AT ABOUT 30 MINS AND I WAS SUPPOSED TO BE OVER GREENVILLE; AL; AT AN ADDITIONAL 48 MINS. AFTER FLYING AT 3500 FT FOR AN ADDITIONAL 40 MINS; I HAD NOT SEEN EITHER THE CLAYTON; AL; OR THE TROY; AL; ARPTS. AS I FLEW W; I NOTICED A MAJOR NS HWY; WHICH I THOUGHT WAS HWY 231 AND AN ARPT TO MY N. I THOUGHT IT WAS THE TROY ARPT AND MY RADIO WAS TUNED TO 122.8; THE TROY FREQ. I ENTERED THE DOWNWIND FOR THE TROY ARPT AND ANNOUNCED MY POS AND INTENTIONS TO LAND AND TURNED ON MY LNDG LIGHTS AND TURNED BASE AND FINAL FOR THE EW RWY 28 AND ANNOUNCED AT EACH TURN. AS I LANDED; I NOTICED THE HANGARS WITH SIGNS THAT SAID ALABAMA AIR NATIONAL GUARD AND I IMMEDIATELY KNEW THAT I WAS IN MONTGOMERY AT DANNELLY FIELD. THE NS HWY THAT I SAW WAS INTERSTATE 65. I TAXIED OFF THE RWY AND RETURNED TO THE FAR EASTERN END OF THE ARPT; SO I COULD GET MY BEARINGS AND THE MONTGOMERY CTL TWR FREQS ON THE ATLANTA CHART. JUST AS I FOUND THE FREQ AND TUNED IT; THE TWR WAS TALKING TO ME AND I RESPONDED. AT THAT TIME; THE ARPT SECURITY GUARD WAS BESIDE ME AND ASKED ME TO SHUT THE PLANE DOWN AND COME TO HIS VEHICLE. I EXPLAINED THAT I WAS DISORIENTED AND I THOUGHT I WAS LNDG AT TROY; AL. I EXPLAINED THAT I WAS HEADED TO GREENVILLE; AL; AND THEY MADE SURE THAT I WAS OK. THE RWY IN USE WAS RWY 10 AND TO CONTINUE WITH MY FLT TO GREENVILLE AND GAVE ME A SQUAWK CODE; SO THEY COULD PROVIDE FLT FOLLOWING TO GREENVILLE. I TAXIED BACK AND TOOK OFF; FOLLOWED THE INSTRUCTIONS OF DEP CTL AND; IN ABOUT 20 MINS; THEY TOLD ME THAT I SHOULD SEE GREENVILLE ABOUT 10 MI AT MY 12 O'CLOCK POS. I RESPONDED THAT I HAD GREENVILLE IN SIGHT AND THEY RELEASED ME. I LANDED AND TIED DOWN THE PLANE. THE NEXT MORNING; I FUELED UP AND DEPARTED. I RETURNED TO HOME BASE SAFELY.