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134 Military Jet Engine Acquisition it interfaces with the aircraft mission computer and cockpit displays, electrical system, inlet, airflow bleed, horsepower extraction, fuel systems, mechanical interfaces, and engine bay cooling. Given that today’s aircraft are migrating toward fully integrated propulsion and flight controls, this testing becomes an even more critical component of the development program, and it is likely that the demands in this area of the development program will continue to increase. Environmental testing verifies satisfactory engine operation, perfor- mance, and durability when the engine is subjected to extreme conditions that are anticipated in service. This testing can include, but is not limited to, bird, sand, or water ingestion, steam ingestion, operation with water-saturated fuel, anti-icing capability, corrosion testing, and the like. The specifics and extent of environmental testing that is conducted are based on the requirements of individual programs. Once the cadre of test assets is established, the timing and sequenc- ing of this test work become as critically important as the actual tests that are conducted. Individual engines are not run continuously through the development program (although there are always en- gines in the test cycle). Instead, engines are run in specific blocks of time, depending on the type of test to be run and the data to be col- lected. The down time between engine runs is used for data analysis, hardware inspection, design changes, hardware rebuild, engine re- configuration, and transportation. Information gathered from the testing, monitoring, and inspection of one engine is transferred into subsequent builds to ensure that the most timely and representative hardware and software configurations are rigorously tested. Engine development testing takes a building-block approach, with confi- dence in the system’s ultimate performance gradually building and working up to qualification of full system capability. The notional test plan in Figure C.2 shows FETT 18 months after System Development and Demonstration contract authorization. This assumes a significant amount of component rig and core engine work has been completed in the Concept and Technology Develop- ment and enough funding is in place to provide for long-lead-time material and hardware fabrication. After the first full engine goes to test, more engines are added to the test program based on the con- tractor’s ability to provide those additional engines and the avail-PDF Image | Military Jet Engine Acquisition Technology Basics and Cost-Estimating Methodology
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