What was found
SHIP 9521 -ATB/GEAR/DE- THE FLIGHT CREW PERFORMED AN AIR TURN BACK TO CLT DUE TO A "RIGHT MAIN LANDING GEAR UNSAFE" MESSAGE WITH AN ASSOCIATED "RIGHT GEAR DOOR OPEN" MESSAGE. THE ALTERNATE GEAR EXTENSION LEVER WAS PULLED. AN EMERGENCY WAS DECLARED WITH ATC. CORRECTIVE ACTION: MAINTENANCE FOUND THE RT MLG DOOR ACTUATOR EYE-BOLT NUT LOCKING TAB SHEARED CAUSING THE PISTON ROD TO BACK OFF THE EYEBOLT. INSTALLED A SERVICEABLE LOCKING TAB AND RIGGED THE RT MLG DOOR PER B717 AMM 32-34-03. (LP #6746516)