What was found
IAH - DURING FLIGHT 3992, THE PILOT REPORTED THE NR 2 PROP FEATHERED, UNCOMMANDED, IN FLIGHT. THE AIRCRAFT RETURNED AND LANDED AT IAH WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE BETA BLOCK ASSEMBLY. SUBSEQUENTLY, THE PROPELLER ASSY, AND GOVERNOR ASSY WERE ALSO CHANGED DUE TO FEATHERING IN FLIGHT, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)