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128 Military Jet Engine Acquisition subsystem. For this reason, engine and aircraft developments are very closely linked. First flight and Initial Operational Capability (IOC) milestones for the weapon system must be assigned in concert with the engine’s corresponding FETT, PFR, ISR, and OCR mile- stones to ensure a fully integrated operational system at each check- point. For example, the engine’s ability to meet a given FETT date, and eventually the PFR date, is driven by its level of design maturity when entering into development, the availability of raw materials, the length of the hardware fabrication cycle, and the amount of hardware and software integration required. The engine FETT and PFR milestones directly influence the weapon system’s ability to achieve its first-flight milestone. Similarly, the engine ISR milestone, which demonstrates engine performance, and the OCR milestone, which demonstrates specification life requirements, are both critical factors in the eventual IOC of the weapon system. In agreeing on development program milestone dates, an obvious consideration is the testing required for approval of each milestone and the resources—the hardware assets, available time, and fund- ing—to achieve it. It is a straightforward exercise simply to impose milestone dates on the engine program based on an end date defined at the weapon-system level. A much greater challenge is negotiating a balance between the cost and scheduling pressures with the engi- neering and test work required to produce a high-integrity system. Therefore, if an aircraft must be operational by a given date or if funding is constrained, engine design may have to be simplified to meet the necessary milestones.8 Conversely, if meeting established specification requirements is paramount, difficulties can and will delay deployment of the weapon system. EFFECT OF DESIGN AND TESTING TOOLS ON DEVELOPMENT COST AND TIME The advent of more-sophisticated design and testing tools has both simplified and complicated the engine testing and qualification pro- ______________ 8In this instance, block upgrade approaches are often used, not just for the engine, but for other major subsystems as well. This is a perfectly acceptable approach, as long as the weapon system is able to meet threshold cost, schedule, and performance requirements with the relaxed subsystem requirements.PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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