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The application of dual redundancy engine condition monitoring technology in aircraft, ships, armored , automotive electronic control system can improve the security and reliability of aircraft, ships, armored, auto running. A turbo shaft engine as the research object,the dual redundancy engine condition monitoring technologies are studied, we develop a dual redundancy engine condition monitoring system,this paper introduces the overall design, hardware and software design of the system, redundancy design, the design of virtual instrument, and introduces the embedded PC/104 module in the design of dual redundant engine condition monitoring system. In order to make the scalability and adaptability of the condition monitoring system has better, this system is designed to work in two ways:airborne operation and ground test method. Automatic monitoring the state of the engine by the two way, to provide scientific basis for analysis of status, trend of engine fault diagnosis and condition based repair.The turbo shaft engine condition monitoring system using dual redundancy engine condition monitoring technology has got acorss extensive ground tests and flight tests in a certain type of helicopter,it can fulfil the requirements of function and has a good performance.At present, the system has been applied in a certain type of helicopter.