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Sundstrand Aerospace, Rockford, Illinois, is developing an Integrated Thermal Energy Management (I-TEM) software assessment tool under contract (F33615-91-C-3407) to the Air Force Flight Dynamics Directorate at Wright Laboratory. The program is focused on developing a user-friendly, automated aircraft analysis tool capable of evaluating multiple thermal energy management approaches and assessing vehicle-level impacts. I-TEM compiles and uses extensive subsystem knowledge in areas of thermal management, electrical power, auxiliary power, actuation, environmental control and fuel systems to promote more efficient aircraft design. Vehicle level penalties (i.e., weight, size, reliability, power extraction) are assessed and used to estimate overall vehicle performance for a given aircraft, mission, and heat load profile.