A computer simulation program has been developed to assist aerospace engineers and managers in making decisions affecting fleet reliability, maintenance strategies, and engine operating costs. This program, based on years of turbine engine experience and innovative uses of the Weibull probability distribution, accurately forecasts removals of engine components, operating and interacting as a system, under different maintenance strategies. Input variables allow the user to tailor the simulation model to fit a specific fleet, engine and maintenance plan. Outputs result in a comprehensive assessment of fleet and component reliability, maintenance requirements, and operating cost. An example of a simulation referred to as the LOCI engine simulation is presented.