What was found
ON APPROACH, SELECTED GEAR DOWN AND THE RT MAIN GEAR INDICATION LIGHT DID NOT ILLUMINATE. CREW PULLED THROTTLES BACK AND THE GEAR HORN DID NOT SOUND. ROTARY TEST SHOWED LIGHT BULB WAS FAULTY. GEAR EMERGENCY EXTEND PROCEDURE WAS FOLLOWED IAW THE CHECKLIST AND AN EMERGENCY WAS DECLARED. ACFT DIVERTED. LANDING WAS UNEVENTFUL. MX TROUBLESHOT THE DISCREPANCY TO A FAULTY RT MAIN GEAR INDICATOR LIGHT BULB. THE BULB WAS REPLACED, N2 SYS WAS BLED AND SERVICED, AND GEAR SWINGS WERE PERFORMED. SYS OPS AND LEAK CHECKS WERE GOOD. ACFT WAS RETURNED TO SERVICE.