A CL65 ON SHORT FINAL EXECUTED A GAR FOLLOWING A CAS INDICATION OF SEVERAL ABNORMALITIES INCLUDING A NOSE GEAR DISAGREEMENT.

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THE FLT WAS CLRED FOR A VISUAL APCH. APCH CTL ADVISED THAT A MIG FIGHTER WAS ON THE APCH ALSO. THE ACFT HAD INTERCEPTED THE RWY 27 LOC AND WAS SLOWING TO 210 KTS WITH THE SPD BRAKES DEPLOYED. APCH CONFIGN WAS INITIATED IN NORMAL SEQUENCE FOR THE CL-65 SERIES OF ACFT; FLAPS 8 DEGS; 20 DEGS; THEN GEAR DOWN. AS THE GEAR WAS EXTENDED; THE FOLLOWING CAS MESSAGES POSTED ON EDU #1. NOSEWHEEL STEERING INOP; STABILIZER TRIM; MACH TRIM; WITH TRANSIENT AURAL MESSAGES OF 'NOSE DOOR' OUR POS FROM THE RWY WAS 4 NM AHEAD. CONFIGN WAS NOW FLAPS 45 DEGS ON APCH SPD. IN THE NEXT MI BOTH PLTS SAW THE MIG ON THE RWY; AND THAT THE CAS MESSAGES NEEDED TO BE RESOLVED. THE DECISION TO GO AROUND WAS MADE AND EXECUTED. AS THE GEAR WAS RETRACTED; A GEAR DISAGREEMENT CAS/AURAL WARNING POSTED. PER OUR ARR BRIEF; WE EXECUTED L TFC AT 2500 FT MSL; HANDED OFF TO NEW YORK APCH; CAPT DECLARED AN EMER. AFTER THE GAR/MISSED APCH CHKLIST; THE CAPT BRIEFED THE FLT ATTENDANT AND PAX. THE CAPT RAN GEAR DISAGREEMENT/NOSEWHEEL STEERING INOP/MACH TRIM/STABILIZER TRIM QRH'S. AS THE NOSEWHEEL STEERING INOP CAS MESSAGE CLRED; THE GEAR DISAGREEMENT CAS CLRED. ALL GEAR/ACFT INDICATIONS NORMAL. THE ACFT WAS CLRED BY TWR FOR A VISUAL APCH. LNDG/ROLLOUT WAS NORMAL. THE CAPT TAXIED IN. ONCE THE PAX WERE DEPLANED; MAINT AND DISPATCH CONTACTED; THE ACFT LOGBOOK WAS NOT USED TO DOCUMENT THIS EVENT. PLT GROUP JOINT SAFETY ACTION RPT FILED WITH CENTRAL AIR SAFETY COMMITTEE WITHIN SPECIFIED TIME LIMITS.