This monograph describes a model for evaluating the combined capacity of organic (U.S. Air Force–owned and –operated) and contractor maintenance assets to meet aircraft programmed depot maintenance (PDM) workloads. The PDM Capacity Assessment Tool (PDMCAT) forecasts the average number of aircraft that will be in PDM status each year over several decades,1 based on the initial number of aircraft in PDM status, the physical capacity of the facility or facilities (number of docks available for cond