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Integrated system-level analysis capability is critical to the design and optimization of aircraft thermal, power, propulsion, and vehicle systems. Thermal management challenges of modern aircraft include increased heat loads from components such as avionics and more-electric accessories. In addition, on-going turbine engine development efforts are leading to more fuel efficient engines which impact the traditionally-preferred heat sink - engine fuel flow. These conditions drive the need to develop new and innovative ways to manage thermal loads. Simulation provides researchers the ability to investigate alternative thermal architectures and perform system-level trade studies. Modeling the feedback between thermal and engine models ensures more accurate thermal boundary conditions for engine air and fuel heat sinks, as well as consideration of thermal architecture impacts on engine performance.