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Aircraft Turbine Engine Development 127 culled out through operation in the field. Correction of these defi- ciencies relied on a robust post-development Component Improve- ment Program, the role of which is to enhance reliability or durability or to regain lost performance in an already deployed system. How- ever, the full redesign cycle, from initial identification of a problem to the commitment of funds for the engineering work (Component Im- provement Program) to correct it, and the eventual development and incorporation of that correction, could be extensive, depending on the magnitude of the problem. This caused some systems to suffer long periods of inadequate operational performance or availability while these steps were taken. With ever-increasing performance and durability requirements and more-aggressive mission profiles, as well as the advent of more so- phisticated design and qualification tools, the philosophical ap- proach to aircraft turbine engine design has evolved significantly over the years. As material composition of engines migrated from the more conventional materials into more-advanced materials such as super alloys, and the engine community began to understand the implications of cyclic fatigue on engine durability, the government significantly increased its qualification requirements for military air- craft turbine engines. The late 1960s marked a significant change in the military engine development and qualification process. It was at this point that the MQT milestone was replaced with Initial Service Release (ISR) and Operational Capability Release (OCR) milestones. The ISR milestone was to provide assurance that critical system specification requirements had been met and that the engine was producible. The engine then moved into extended mission-based durability testing to provide confidence that the system would achieve full specification life and was ready for full-rate production at OCR.7 TEST PROCESS MILESTONES As mentioned earlier, today’s military engine development programs follow the same acquisition model as that of a military aircraft. The military engine, today more than ever, is a highly integrated aircraft ______________ 7Cote and Lilly (1985) provide more specific background on a number of aircraft tur- bine engine development programs conducted in 1985.PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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