'Awaiting Parts Time' in a Multi-Indenture, Readiness-Based Sparing Model

This research memorandum presents a means of calculating the expected length of 'awaiting-parts time' of weapon replaceable assemblies, which are needed to calculate aircraft readiness in a multi-indenture, readiness-based sparing model. The method presented is appropriate for any other level of indenture. Although full scale application of the model is not feasible at this time, the model aids in comparing and evaluating existing models.