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52 Military Jet Engine Acquisition components as compared with the original design. An example of a categorical change scale for aircraft engines is presented in Table 5.2. The scale in the table, developed by NAVAIR, rates the various types of changes done to an aircraft engine by the engine producers. As with the TRL scale, technological difficulty notionally increases with the categorical change scale. Each engine that NAVAIR included in its cost database provided to us as part of this study was rated according to this scale. Additional Measures of Technical Risk and Maturity To supplement the technical risk and design maturity measures, we examined several additional parameters that fell within the following four categories: Advanced Technology Engine Developments. Some engines incor- porate advanced materials and technologies. The maturity of these new materials and technologies influences development costs. In Category Table 5.2 NAVAIR Technical Change Scale for Aircraft Engines Type of Modification 1.0 Derate (reduction in preformance) (example: F405-RR-400) 1.1 Modification 1.2 Duty cycle change 1.3 Demonstrator program 2.0 Small uprate (<5%) 2.1 Modest uprate(<10%) 3.0 Cold section redesign 3.1 Gearbox addition 3.2 Fan addition to core (example: TF34-2) 4.0 Hot section redesign 4.1 Afterburner addition to dry engine 5.0 Minor overall redesign (example: F404 II) 5.1 Core scale up/down (example: F101DFE) 6.0 Derivative (same engine type) 6.1 Major component redesign 7.0 Derivative (different engine type) 7.1 Major overall redesign 8.0 New engine with demonstration (F100) 8.1 New engine w/o demonstration (J93) 9.0 New design in new class (example: PW100, PW2037)PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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