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- Development of a Performance Prediction Model for the CFM56-7B EnginePublication . Girão, Bernardo Pereira; Brojo, Francisco Miguel Ribeiro Proença; Ferreira, Antonio Calado; Sousa, Daniel da FonsecaWith the development of software tools and their application in maintenance shops, it is possible to predict which modules or components are malfunctioning and redirect the right resources to inspect and fix the problem, saving time, money and most importantly ensuring the safety of the aircraft. This thesis focuses on the development of a prediction model for the CFM56-7B Engine based on the previous principle, one of the most widely used engines in commercial airline history, in coaboration with TAP&ME. The GasTurb software was used to tailor the model. Gasturb is an engine performance modeling software that allows the input of data from the engine testbed. By correlating the turbofan engine performance loss at a modular level, it is possible to identify which component is not performing as expected. A thermodynamic model was construct using has anchor a cycle reference point from a correlation test report from a well-functioning engine running at certain conditions. The offdesign phase involved matching the model to the performance of an engine working under a range of conditions such as specific speed, mass flow and pressure ratio. This ”Golden model” that can be used by TAP as a benchmark for other engines, enabling a optimization in resources such as cost and money making it a desirable tool for a Maintenance Repair overhaul (MRO) company to have.