In order to assess the maintainability of weapon system on the system-level more scientifically and accurate, the concept of "Influence degree" is introduced into this study under the consideration of the relational degree between the influence of components on system and assessment indicators. By combining the weight of each component, we get the integrated system maintainability index. Then the comprehensive assessment of the maintainability of weapon system is made by computing the influence degree of each component's assessment indicators on system maintainability. The assessment results show that this method is more credible and the information obtained through the maintainability assessment process has great significance for system design and maintainability improvement.
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