What was found
AFTER SELECTING LG HANDLE TO THE DOWN POSITION WHILE ON APPROACH, FLIGHT CREW DID NOT GET A GEAR DOWN, GREEN LIGHT, INDICATION ON THE RT MAIN GEAR. THE GEAR HANDLE, RED, UNLOCK LIGHT WAS NOT ILLUMINATED & THERE WAS NO GEAR HORN WITH THE THROTTLES RETARDED. FLIGHT CREW SWAPPED GEAR INDICATION BULBS SEVERAL TIMES & CONCLUDED THAT IT WAS A FAULTY INDICATOR. DURING A FLYBY, CREW RECEIVED CONFIRMATION FROM THE CONTROL TOWER THAT ALL THREE GEARS APPEARED DOWN, LANDED WITHOUT INCIDENT. CLEANED THE LIGHT SOCKET CONTACTS & REPLACED THE BULB PN 387. OPERATIONAL CHECK WAS NORMAL. ACFT WAS RETURNED TO SERVICE.