What was found
PILOT REPORTED THAT RT MAIN GEAR WOULD NOT EXTEND DURING APPROACH INTO KSJT. PILOT PERFORMED MANUAL EXTENSION AND DECLARED EMERGENCY. MAINTENANCE TROUBLE SHOT AND FOUND LEFT GEAR DOWN ACTUATOR NEEDED RIGGING. MAINTENANCE RIGGED GEAR PER THE MAINTENANCE MANUAL. LANDING GEAR RETRACTION AND EXTENSION OPERATIONAL CHECKS WERE PERFORMED SEVERAL TIMES THOSE CHECKS WERE GOOD. AIRCRAFT HAS BEEN RETURNED TO SERVICE.