A POLICE HELI AND AN SMA HAVE AN NMAC WHILE CONDUCTING ILS APCHS IN VMC.

Narrative

I WAS PIC OF A HELI CONDUCTING INST TRAINING AT FDK. I WAS IN THE L SEAT AND THE OTHER PLT (COMMERCIAL AND INST) WAS USING FOGGLES IN THE R SEAT. WE HAD INTERCEPTED THE FINAL APCH COURSE FOR ILS 23 AT APPROX 11 NM AT 2300 FT MSL. I HAD MADE 3 RADIO CALLS ON 123.00 STATING OUR LOCATION AND INTENTIONS. I CALLED NUMBE INTXN INBOUND ILS 23 FDK. APPROX 5 SECONDS LATER; I OBSERVED AN SMA XING OUR FLT PATH; R TO L AS HE CALLED PROC TURN OUTBOUND. I IMMEDIATELY TOOK THE ACFT CTLS AND TOOK EVASIVE ACTION BY DIVING R. WHEN I ASKED THE SMA PLT IF HE HAD SEE US; HE REPLIED; 'NOT UNTIL I WAS IN THE TURN.' THERE WERE NUMEROUS ACFT IN THE TFC PATTERN AS WELL AS 2 ACFT ON THE ILS IN FRONT OF US. I WAS ACTIVELY LOOKING FOR TFC WHEN THIS INCIDENT OCCURRED. THE CTR POST OF THE WINDSCREEN PROBABLY PREVENTED MY SIGHTING THE SMA SOONER; ALTHOUGH I WAS SCANNING AROUND THE POST AS A MATTER OF ROUTINE. MY ACFT WAS DISPLAYING 2 LNDG LIGHTS ILLUMINATED AT THE TIME OF THE INCIDENT. I FLY IN THE FREDERICK AREA QUITE A BIT. MY OPINION AS A PROFESSIONAL PLT IS THAT IT IS THE MOST UNSAFE ARPT I HAVE EVER FLOWN AROUND. THERE IS TOO GREAT A MIX OF DIFFERENT TYPES OF ACFT; NUMEROUS RWYS AND TFC PATTERNS; AND INST APCHS -- ALL AT A NON-TWR ARPT -- TO SAFELY CONDUCT FLT OPS.