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With a large number of airborne devices powered by electric energy such as aviation Instrumentation and transmission system, the role of electric power in modern aviation aircraft is becoming increasingly important. As the hub between power generator and airborne electrical devices, the reliability of aircraft secondary power supply for electrical equipment stable operation is of great significance. Apply the BIT technology can monitor operating state of aircraft secondary power supply in real-time, however false alarm problems for the application of the BIT technology caused a lot of trouble. For a type of aircraft secondary power supply using reasonable hardware design combined with effective monitoring algorithms can significantly improve false alarm rate of BIT system. Whereby the operator can get the operating state of aircraft secondary power supply, to identify problems in time and reduce losses.#$NLKeywords: Aircraft power; Built-in test; TMS320F28335; CAN bus