What was found
GEAR WAS EXTENDED FOR LANDING, CREW DID NOT RECEIVE THE RIGHT MAIN GEAR INDICATION. THE SAME INDICATION OF 2 GREEN, AND NO RED WAS RECEIVED WHEN LANDING GEAR CYCLED. WHILE IN HOLDING PATTERN CREW CONFIRMED GEAR CONTROL CIRCUIT BREAKER WAS IN, AND THE GEAR LIGHTS WERE TESTED. ONLY 2 GREEN AND 1 RED INDICATION WERE OBSERVED DURING THE TEST. AN EMERGENCY WAS DECLARED, AND A REQUEST FOR EMERGENCY RESCUE VEHICLES WAS MADE. DURING A LOW APPROACH THE LANDING GEAR WERE VISUALLY CONFIRMED TO BE IN THE DOWN POSITION. THE CREW MADE AN UNEVENTFUL LANDING IN KSSI. MAINTENANCE REPLACED THE 327 LAMP FOR THE GEAR INDICATION, AND PERFORMED A SATISFACTORY OPERATIONAL TEST. THE AIRCRAFT WAS RETURNED TO SERVICE.