Comparing Multi CriteriaWeighted Decision Methods for Simultaneous Operational Aircraft Maintenance Processes

Some aircraft damages require immediate attention. Typically, there are several alternative actions, resulting in varying outcomes. Application of MCDM was investigated to quickly choose the best scenario, as this is not always immediately apparent. In doing so, this research contributes to the state-of-the-art by a) considering alternative evaluation for multiple simultaneous operational occurrences and b) performing a comparative analysis of several MCDM methods in terms of applicability, suitability and robustness. WSM, TOPSIS and VIKOR have been identified as potentially appropriate. Using the criteria survivability, time and cost, different scenarios have been evaluated. It resulted that for single occurrences the outcome only varies for very extreme weight settings. In a multiple damage occurrences scenario, i.e. several aircraft competing for limited resources, differences have been found. While TOPSIS and VIKOR generate similar recommendations, WSM yields different results. Furthermore, it was found that VIKOR is not suited for the used heuristic approach, as it results in an ambiguous performance score of several solutions relative to each other. Its sensitivity makes its use in an operational environment questionable, as small changes easily lead to a different recommendation. Looking at the frequent use of a DSS in an operational environment as opposed to a strategic one, WSM is the best choice. This is due to its ease of implementation, its robustness and its simplicity.Aerospace Engineerin