On the aircraft, the utilities management computer completes the information interaction with the utilities systems and the avionics system, which plays a vital role in ensuring the safe flight of the aircraft. This paper mainly discusses the voice alarm mechanism of utilities systems based on utilities management computer. For the voice alarm that occurs during the flight, the fault inspection and mechanism analysis are carried out. For the reported bus access timeout fault, the fault location is completed and a solution is proposed. It will provide important support for the development and guarantee of the computer to ensure the safe flight of the aircraft and the utilities management.