PA-34 PLT LANDED AT UNFAMILIAR ARPT AND OVERRAN THE RWY END. ACFT WAS THEN FLOWN TO HOME ARPT WHERE DAMAGE WAS DISCOVERED. ACFT WAS THEN FLOWN WITHOUT FERRY PERMIT TO A LOCATION FOR MAINT REPAIR.

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COMPLETED CLOUD SEEDING MISSION AND LANDED IN FRONT OF CELL TO ALLOW PASSAGE AND A LATER RETURN-TO-BASE. HAD NEVER LANDED AT THIS ARPT; AND THEREFORE; ASSUMED IT WAS COMPARABLE TO ALL THE OTHER ARPTS IN THE AREA AT +/-5000 FT. UPON REACHING THE 'HUMP' IN THE MIDDLE OF THE RWY; DISCOVERED THE OTHER PART OF THE RWY WAS NOT THERE; AND OVERRAN THE RWY THROUGH THE PERIMETER FENCING; WHICH WAS SOME 50 PACES AWAY AND SUBSTANTIALLY DOWNHILL. WITH NO PHONE AND 5 HRS TO WAIT FOR SOMEONE TO APPEAR; I BEGAN CLRING THE RUBBLE; INSPECTED THE ACFT IN THE DARK; AND IT LOOKED PRETTY GOOD. THEREFORE; IT EVENTUALLY DAWNED ON ME TO CRANK THE ENGS; AND IF OK; TAXI THE ACFT TO THE RAMP. UPON NORMAL START AND PERFORMANCE; I TAXIED BACK TO THE PAVEMENT. WITH EVERYTHING IN THE GREEN; A RUN UP WAS PERFORMED AND ALL SYS WERE 'GO.' AT THAT POINT; I DECIDED TO TAKE OFF AND RETURN TO BASE. THE NEXT MORNING; ANOTHER INSPECTION REVEALED MORE SCRAPES AND DINGS AND A BLADE THAT WAS Q-TIPPED; BUT SINCE DURING THE PREVIOUS FLT THERE WERE NO VIBRATIONS; NO OIL LOSS; ETC; ETC; I AGAIN FLEW THE ACFT TO THE MECH SOME 25 MINS AWAY.