Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology

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Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology ( military-jet-engine-acquisition-technology-basics-and-cost-e )

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Aircraft Turbine Engine Development 135 ability of adequate funding. By the PFR milestone, a good portion of the sea-level and altitude development, operability, and functionality test work, and some AMT/endurance testing, should be complete. By the low-rate production milestone, all functional and performance requirements should be verified. All sea-level and altitude develop- ment and altitude performance work should be complete. By the high-rate production milestone, hot section life verification and all AMT/endurance testing should be complete, and the system should have demonstrated full compliance with the specification require- ments. Adequate funding, and the appropriate funding stream, is critical in successfully completing the objectives of the development program. Because the start of an engine development program is hardware- intensive, most recent programs have required a financially front- loaded funding profile. The profile levels out in the middle of the program to support sustained testing and increases toward the end of the System Development and Demonstration portion of the pro- gram to provide for final qualification and flight test support. Because of the critical interaction among weapon-system and en- gine-level milestones, schedules, required assets, test sequencing, and the associated costs and funding profiles, the formulation of air- craft and engine development plans has evolved into a cooperative process to ensure the successful achievement of program milestones at all system levels. TRENDS IN MILITARY ENGINE DEVELOPMENT Intuition might suggest that as technology improves and design, testing, and evaluation tools become more sophisticated, develop- ment time and cost for new systems should decrease. However, this is not the case, and customers are demanding increasingly greater performance, durability, and affordability from their systems. Much of the performance advantage in turbofan engines has been achieved through the use of lighter-weight, exotic materials and significantly more-complex geometry. Any cost or schedule advan- tage associated with the application of advanced technologies or de- sign tools is quickly offset by the design complexity required to meet

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