Expertise helps to judge the causes of breakdowns, deviations in operation and failures, and also allows you to understand why there is no established service life. The expert can say about the presence of discrepancies in the technical characteristics of the equipment and standardized indicators. The study allows you to understand when repairs are required outside the regulations. An examination is required if the equipment has been operating for some time in a technically unacceptable environment — during a fire, an emergency. The expert can name the residual resource of the device.