Methodological aspects of ensuring the survivability of the human-machine system considered as an example of one of the tasks of maintaining the active life of the spacecraft. Onboard equipment considered as a complex system consisting of functional blocks developed in various organizations using various technologies. As a tool for assessing the survivability of on-Board equipment of the proposed comprehensive criterion to evaluate the technical condition of the functional blocks defined by the probability of failure of the system software and hardware within these units, combined with the reliability of operators with on-Board equipment.