What was found
THE CREW WAS CONDUCTING A MAINTENANCE ACCEPTANCE FLIGHT ON AIRCRAFT FOR THE REPLACEMENT OF LEFT AND RIGHT PROPELLERS. THE NTS SHUTDOWN PROCEDURE WAS BEING PERFORMED IN-FLIGHT AS REQUIRED ON THE RT ENG. DURING THE NTS SHUTDOWN, THE RT PROPELLER DID NOT FULLY FEATHER & COPILOT PULLED FURTHER BACK ON THE EMERGENCY SHUTDOWN HANDLE TO FULLY ACTUATE THE FEATHERING VALVE. THIS CAUSED THE RT ENG SHUTDOWN LINKAGE TO BIND. THE COPILOT TRIED TO RETURN EMERGENCY SHUTDOWN HANDLE TO NORMAL POSITION & WOULD NOT MOVE. CREW MADE DECISION TO LEAVE ENG & PROP (FULLY FEATHERED AT THIS TIME) SHUTDOWN & RETURN TO KSHR ON LT ENG FOR A SINGLE ENGINE LANDING. MX INSPECTED RT ENG SHUTDOWN LINKAGE AND DISCOVERED BINDING HAD OCCURRED AT THE TELEFLEX CABLE JUST PRIOR TO THE EMERGENCY SHUTOFF VALVE. IT WAS ALSO DISCOVERED THAT THE FEATHERING VALVE DID NOT FULLY ACTUATE DUE TO RIGGING. THE TELEFLEX CABLE WAS TAKEN APART, CLEANED, REASSEMBLED AND EMERGENCY SHUTDOWN RIGGING WAS PERFORMED WITH NO FURTHER DISCREPANCIES NOTED.