ACFT LANDED WITH R MAIN GEAR POS LIGHT NOT ILLUMINATED.

Narrative

I CONTACTED DANBURY CTL TWR APPROX 9 MI TO THE E OF THE FIELD AND WAS TOLD TO CONTACT THE TWR AGAIN ON A 4 MI FINAL. UPON REACHING THIS LOCATION AT APPROX 1700 MSL; I SLOWED THE ACFT AND LOWERED THE GEAR. A CHK OF THE 3 GREEN GEAR LIGHTS SHOWED THAT THE R MAIN GEAR LIGHT WAS UNLIT. A QUICK ATTEMPT TO RESET THE LIGHT FAILED TO CORRECT THE PROBLEM. I THEN NOTIFIED THE TWR I WAS GOING AROUND AND HAD AN UNSAFE GEAR LIGHT. UPON STABILIZING THE ACFT; I PROCEEDED TO FOLLOW EMER GEAR EXTENSION PROCS. A TWR FLY-BY SHOWED THE GEAR TO BE APPARENTLY DOWN AND LOCKED. APPROX 10 MINS AFTER MY INITIAL CALL TO THE TWR; ATC DECLARED AN EMER. ADDITIONAL ATTEMPTS TO REMEDY THE SITUATION BY RECYCLING THE GEAR FAILED. I CONDUCTED 1 ADDITIONAL TWR FLY-BY TO CONFIRM GEAR POS. 12 MINS AFTER DECLARING THE EMER; THE ARPT WAS CLOSED. 10 MINS LATER I MADE A SUCCESSFUL AND UNEVENTFUL LNDG. 7 MINS LATER THE ARPT THEN REOPENED. I RPTED TO THE TWR FACILITY WHERE MY NAME AND TELEPHONE NUMBER WERE REQUESTED. I WAS TOLD A FORM WILL BE FILED WITH THE LCL FSDO OFFICE. I WAS INFORMED THEY MAY CALL AND QUESTION ME ABOUT THE EVENT. FEW ACTIONS OR DECISIONS COULD HAVE PREVENTED THIS EVENT FROM OCCURRING. THE ACFT HAD FLOWN 3 DAYS BEFORE AND HAD LANDED WITHOUT PROBLEM 2 HRS PREVIOUSLY. A MECH IS DUE TO CHK THIS MALFUNCTION WITHIN THE NEXT 48 HRS. HIS INITIAL DIAGNOSIS WAS A FAILED MICROSWITCH. SUCH COMPONENT FAILURE IS USUALLY CATASTROPHIC AND CANNOT BE ANTICIPATED.