Earlier models are extended and combined to provide an analytic means of estimating the average number of inoperative machines in a two-echelon (bases and a depot), two-indenture (machines have components which may have modules) maintenance system with spares and repair. Separate expressions are developed for the no cannibalization and complete, instantaneous cannibaliza tion cases. The expressions are suitable for verification of aircraft maintenance system simulation models as well as for estima tion of system performance and the maximum benefit of cannibalization.
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