HAWKER LANDS RWY 9L AT OPF AFTER CURFEW FOR RWY USE. NEVER ADVISED BY BRIEFERS OR NOTAMS.

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DEPARTED DAY OCT/SUN/05 XA08; AFTER RECEIVING FLT BRIEFING AND FILING FLT PLAN THROUGH COMRDO AND WSI. AT XB50 RECEIVED OPF ATIS FOR ARR. COPIED ATIS; WINDS AT 040 DEGS AT 9 KTS; 10 MI VISIBILITY CLR; RWY 9L/27R IN USE; CLRNC/GND FREQ 121.9; NOTE NO REF TO ANY NOTAMS. OCT/SUN/05 APPROX XC21; NIGHT; IFR FLT PLAN. VECTORED TO FINAL ILS RWY 9L/27R OPF BY ZMA. N OF THE FIELD AT 4000 FT; WE ADVISED APCH WE DID NOT HAVE THE RWY AND REQUESTED ILS TO RWY 9L/27R; HE THEN TURNED US W FOR VECTORS TO RWY 9L ILS. WE WERE TURNED ONTO THE APCH AND THEN CLRED FOR THE RWY 9L ILS. WE WERE ADVISED BY ZMA TO CANCEL FLT PLAN THROUGH THIS FREQ 128.6 OR ON THE GND. ALL APCH LIGHTS; RWY LIGHTS; VASI-L LIGHTS AND LOC/GS WERE OPERATIONAL AT THE TIME OF THE APCH. WE BROADCAST ON 120.7 OF OUR POS AND INTENT. WE LANDED AND TURNED OFF AT THE END AND CANCELED IFR WITH A PATCH THROUGH TO AN AIRBORNE ACFT TO ATC. CHKED IN AT THE FBO WHEN WE NOTICED A STACK OF NOISE ABATEMENT ARR/DEP PROCS LAYING ON A DESK BEHIND THE COUNTER. WHEN ASKED FOR ONE; WE WERE ALSO GIVEN A COPY OF A PAGE FROM THE AIR GUIDE OF ARPT NOTAMS WITH RWY 9L/27R CLOSURE DETAILS. OCT/MON/05; I CONTACTED DAY FSS -- NO NOTAMS; CMH FSDO; NO NOTAMS FOR RWY 9L/27R AT OPF. I CALLED THE TWR AT OPF AND WAS TOLD YES; IT IS CLOSED XA00-XK00 DAILY; BUT THAT IS A COUNTY NOTAM AND THEY (THE TWR) DON'T HAVE ANYTHING TO DO WITH THEM AND TO CONTACT THE COUNTY OFFICE. I CALLED THE COUNTY OFFICE AND WAS TOLD THAT IT (THE CLOSURE OF RWY 9L/27R) IS OLD -- MAYBE 2 YRS OLD -- AND EVERYONE THERE KNOWS ABOUT IT. I ASKED WHERE I COULD OBTAIN A COPY OF THE NOTAMS AND WAS TOLD THAT IT IS A RENEWABLE ONE AND IT'S IN 'THAT ARPT BOOK; YOU KNOW; THE ONE THAT COVERS OUR ARPT.' SUMMARY: WHY DIDN'T FSS; COMRDO; WSI; FSDO HAVE THE NOTAM OF RWY 9L/27R CLOSURE? WHY WAS IT NOT ON THE ARR ATIS? WHY DIDN'T ZMA INFORM US OF NOTAM? WHY DID THE COUNTY NOT RENEW THE NOTAM?