As processes and materials used in aircraft engine production change and new information on aircraft engine technology becomes available, cost-estimation techniques must be updated. The authors present the results of a RAND research project to develop a new methodology for estimating military jet engine costs. They focused principally on adding new observations to the cost-estimating database from earlier RAND studies and updating the parametric relationships for engine costs and development time. Their results indicate that rotor inlet temperature, full-scale test hours, and whether an engine is new or derivative are significant measures.
