Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology

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Appendix C AIRCRAFT TURBINE ENGINE DEVELOPMENT The propulsion system of an aircraft, military or commercial, has al- ways been considered a major aircraft subsystem. As performance requirements become more demanding, and as technology evolves, the design and integration of these systems has become more and more complex, posing unique technical and integration challenges to the designer and manufacturer. This is especially true in military aircraft, where ever-increasing tactical mission requirements and an early sustained focus on affordability has driven the prudent devel- opment and application of new technologies to achieve those goals. The U.S. government has been developing aircraft engines for mili- tary applications since the 1940s. Since those first developments, increasingly more-demanding missions and performance require- ments have driven continual advances, not only in engine technol- ogy itself but also in the tools used to develop and apply that tech- nology to new systems. The progressive increase in thrust-to-weight ratio is only one indication of the significant strides made in engine technology over time.1 This particular leap in capability is due, in large part, to the increased thrust and decreased weight achieved through the application of lightweight, high-temperature materials, as well as the more complex component geometries enabled by ad- vances in design and manufacturing technologies. Development of these technically complex systems for the military are governed by the Federal Acquisition Regulation and the DoD’s ______________ 1The trends in thrust-to-weight ratio are depicted in Figure 2.3. 121

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