What was found
FLT 5137 - CLT-RWI - ON APPROACH FOR LANDING, LANDING GEAR WAS EXTENDED. A UNSAFE GEAR ON THE LEFT MAIN WAS INDICATED. AIR CREW DECLARED A INFLIGHT EMERGENCY. AIRCRAFT DID A FLYBY. TOWER TOLD THE AIRCREW THAT THREE GEAR WAS EXTENDED. AIRCRAFT LANDED AT RWI WITH NO OTHER PROBLEMS. MAINTENANCE FOUND A BAD BULB IN THE LEFT GEAR POSITION. REMOVED AND REPLACED BULB, SYSTEM OPS CHECKED GOOD. (M)