What was found
ON APPROACH, THE LEFT HAND MAIN LANDING GEAR FAILED TO INDICATE DOWN AND LOCKED. AN EMERGENCY WAS DECLARED AND FLIGHT HANDBOOK PROCEDURES WERE FOLLOWED. THE FLIGHT CREW REPLACED A GEAR INDICATOR LIGHT BULB. AFTER THE REPLACEMENT, THE INDICATOR ILLUMINATED A DOWN AND LOCKED GEAR CONDITION. THE FLIGHT CONTINUED THE APPROACH AND LANDED WITHOUT FURTHER INCIDENT. OUTSTATION MAINTENANCE INSPECTED THE INDICATOR BULBS FOR DEFECTS AND THE AIRCRAFT WAS RETURNED TO SERVICE.