The definition and calculation of the operational readiness and availability of weapon system have been described. The relationship and difference between them have been analyzed. On the assumption that the repair time, logistic delay time and the relaxation time are subject to different distributions, the models and reasoning of combinations of different distribution and modeling ideas were carried out, the reasonability and typical numerical calculations have been presented according to the modeling results and input data. The trade-offs analyses between the reliability, maintainability and testability indicators based on the modeling results are briefly discussed, and several enlightening conclusions are obtained.

To develop scientific and reasonable maintenance decision-making scheme for equipment during task execution, select a suitable maintenance mode for components, control and reduce the risk of equipment failure to the maximum, this paper analyzes the basic types of maintenance mode for equipment components within task cycle, as well as their influence on the risk of equipment failure. Taking the risk, probability, consequence and detectability of failure as the decision-making indicators, the logical judgment method is employed to create the logical judgment diagram of decision-making risks for maintenance mode of equipment components within task cycle. If any maintenance mode cannot be judged through logical judgment diagram, the safety, task and economic risks are taken as the decision-making indicators, and the fuzzy theory and analytic network process are combined to build a decisionmaking model for maintenance mode risks of equipment based on analytic network process, so as to introduce the decisionmaking method for optimal maintenance mode.

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