What was found
ON APPROACH, CREW EXTENDED GEAR AND DID NOT GET LT MAIN GEAR DOWN INDICATION. FOLLOWING AFM CHECK LIST, A ROTARY TEST FUNCTION FOR THE LANDING GEAR WAS PERFORMED AND THE GEAR WAS BLOWN DOWN. CREW DECLARED EMERGENCY. CREW LANDED ACFT WITHOUT INCIDENT AND TAXIED OFF RUNWAY. ACFT TOWED. ON-SITE MX FOUND LT MAIN GEAR ANNUNCIATOR BULB INOP AND REPLACED BULB. A LANDING GEAR FUNCTIONAL TEST WAS PERFORMED WITH NO ANOMALIES FOUND. ACFT WAS RETURNED TO SERVICE.