Narrative:

I contacted danbury control tower approximately 9 mi to the east of the field and was told to contact the tower again on a 4 mi final. Upon reaching this location at approximately 1700 MSL, I slowed the aircraft and lowered the gear. A check of the 3 green gear lights showed that the right main gear light was unlit. A quick attempt to reset the light failed to correct the problem. I then notified the tower I was going around and had an unsafe gear light. Upon stabilizing the aircraft, I proceeded to follow emergency gear extension procedures. A tower fly-by showed the gear to be apparently down and locked. Approximately 10 mins after my initial call to the tower, ATC declared an emergency. Additional attempts to remedy the situation by recycling the gear failed. I conducted 1 additional tower fly-by to confirm gear position. 12 mins after declaring the emergency, the airport was closed. 10 mins later I made a successful and uneventful landing. 7 mins later the airport then reopened. I reported to the tower facility where my name and telephone number were requested. I was told a form will be filed with the local 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 aircraft had flown 3 days before and had landed without problem 2 hours previously. A mechanic is due to check this malfunction within the next 48 hours. His initial diagnosis was a failed microswitch. Such component failure is usually catastrophic and cannot be anticipated.

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Original NASA ASRS Text

Title: 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.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.