C182 PLT AFTER LNDG AT ITH ARPT MISJUDGES A TXWY TURNOFF AND SLIDES INTO AN EMBANKMENT CAUSING PROP DAMAGE TO THE ACFT.

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FINAL APCH; NO LNDG LIGHTS -- WERE INOP. AT THE DEP ARPT (POU); PREFLT WAS ALL NORMAL INCLUDING LNDG LIGHTS; STROBES; BEACON; TAXI; ETC. LANDED ON RWY 14 TOMPKINS COUNTY. MADE R TURN AT TXWY F; ANOTHER R TURN TXWY ONTO TXWY A. TWR SAID 'MAKE NEXT L AT FBO SIGN AND TXWY E.' IT LOOKED LIKE A TXWY NOT LIT; NO TXWY LIGHTS. I COULD SEE FBO AHEAD. I TURNED AND ACFT SLID INTO EMBANKMENT. AFTER TXWY E SIGN; THERE IS A CONCRETE RETAINING WALL. IF MADE THAT TURN; POSSIBLE SEVERE INJURY AND DAMAGE COULD RESULT. SUGGEST BARRIER AT THAT POINT. PLACEMENT OF FBO SIGN AND TXWY E TO BE EVALUATED FOR BETTER PLACEMENT. TXWY LIGHTS IN RELATION TO THE FBO SIGN AND TXWY E SIGN NEED BETTER PLACEMENT; OR ADD ANOTHER TAXI LIGHT OR LIGHTS BTWN THE SIGNS WHERE L TURN WAS MADE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATED THE FAA FSDO CLASSIFIED THE EVENT AS AN INCIDENT. THE ACFT SUSTAINED ONLY A PROP STRIKE. RPTR SAID THE LIGHTED FBO SIGN SHOULD BE REMOVED OR MOVED CLOSER TO TXWY E. THIS WAS HIS FIRST TIME TO FLY INTO ITH.