What was found
PILOT REPORTED THAT THE RT MLG DOWN INDICATOR LIGHT FAILED TO ILLUMINATE AND THE GEAR HANDLE IN TRANSIT LIGHT WAS ILLUMININATED DURING APPROACH FOR A SCHEDULED LANDING. PILOT FOLLOWED EMERGENCY CHECKLIST AND DECLARED AN EMERGENCY. AIRCRAFT LANDED WITHOUT INCIDENT. RT MLG WAS INSPECTED AND FOUND TO BE IN THE DOWN AND LOCKED POSITION. FURTHER INVESTIGATION FOUND THAT THE DOWN AND LOCKED POSITION INDICATOR SWITCH ASSY WAS FAULTY. A VOLT/OHM METER TEST SHOWED THAT THE INTERNAL SWITCH THAT FEEDS THE RT MLG DOWN INDICATOR LIGHT HAD FAILED IN THE OPEN POSITION GIVING A FALSE INDICATION THAT THE GEAR WAS NOT DOWN AND LOCKED. SWITCH WAS REPLACED AND THE AIRCRAFT RETURNED TO SERVICE.