What was found
DURING APPROACH TO AUS THE GEAR WAS EXTENDED FOR LANDING AND THE RT MAIN FAILED TO SHOW A DOWN AND LOCKED INDICATION. PERFORMED LIGHT CHECK AND FOUND INDICATOR INOP, ALL OTHER INDICATIONS ON GEAR NORMAL. COMPLIED WITH EMERGENCY BLOWDOWN OF GEAR AS A PRECAUTION AND DID A FLY BY TO CHECK IF ALL GEAR DOWN. LANDED AIRCRAFT WITH NO PROBLEMS. MAINTENANCE DETERMINED IT WAS A BAD LIGHT BULB. AIRCRAFT RETURNED TO SERVICE AFTER ALL REQUIRED CHECKS COMPLIED WITH.