Integrated Aerospace Engine Management. Foundations in Estimation and Prediction of Engine Removals
Final rept. 15 May-22 Aug 1974
TECHNOLOGY INC DAYTON OH
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Aerospace engine management is an exceedingly complicated problem with important consequences. Analytical management techniques may have potential application in a future, integrated engine management system. Fundamental to any such system is information about engine lives and the number of engine replacements required to meet flying hour program requirements. In this report, the engine management problem is described in the context of a production system producing flying hours. This perspective shows the necessity for engine life information since the engines produce flying hours. The maximum likelihood estimator of a multi-risk engine life cumulative distribution function with inspections has been derived. It may be an improvement over the actuarial method now used, and information about usage removals and inspection removals is also available from the maximum likelihood estimator. An hierarchical sequence of families of distributions has been constructed for ease of sequential likelihood ratio testing for more information about the engine life distributions.
- Jet and Gas Turbine Engines