A C414 PLT CANNOT FIND HIS APCH PLATE FOR ACJ; GA; ARPT AND DIVERTS TO LGC; GA; BECAUSE OF TERMINAL AREA WX FACTORS. HE GETS AN APCH BRIEFING FROM COLUMBUS APCH; CSG; GA.

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ENRTE IFR FROM 11J TO ACJ; AND WHILE IN CONTACT WITH APCH CTL; IT BECAME TIME TO CHOOSE AN APCH INTO AMERICUS; GA. MUCH TO MY DISMAY; MY GEORGIA APCH PLATE WAS MISSING FROM ITS PLACE ON THE COPLT'S SEAT WHICH WAS UNOCCUPIED. I ALWAYS CARRY A FLT BAG WITH ALL TERMINAL PROCS; HI ALT; LOW ALT ENRTE AND AFD'S -- A COMPLETE AND CURRENT SET. I WAS UNABLE TO LOCATE THE GEORGIA APCH PLATE (SE4) ON THE SEAT WITH THE OTHER CURRENTLY IN USE CHARTS AND DIRECTORIES. SINCE I WAS IN POSITIVE RADAR CTL; I ASKED FOR A VERBAL DESCRIPTION OF A SPECIFIC APCH INTO ACJ. UPON RECEIPT OF ACJ'S LOW IFR WX; I ASKED FOR A VECTOR TO A LOCATION WITH BETTER WX; THE APCH CTLR VECTORED ME TO LGC; GA; WHERE I WAS GIVEN ANOTHER DESCRIPTION OF ILS RWY 31 AT LGC (ALTHOUGH THE FIELD WAS VFR). I DID NOT FEEL THAT SEARCHING THE COCKPIT FOR THE PLATE WAS APPROPRIATE INFLT. THAT WAS WHY I ASKED FOR INFO ON THE APCHS. AFTER LNDG; I DISCOVERED THE MISSING SE4 TERMINAL PROC HAD FALLEN DOWN BESIDE AND AFT OF THE COPLT'S SEAT; OUT OF SIGHT. I CALLED THE WATCH SUPVR AT CTR AND MADE MY RPT. IN ADDITION; THE AUTOPLT WAS NOT OPERATING AND I KNEW IT WOULD BE UNWISE TO LEAVE THE CTLS AND SEARCH. THE FLT ENDED WITH A NORMAL LNDG IN LGC.