A new method for the data validation of gas turbines is introduced that allows to assess engine degradation. The degree of degradation is derived from the analytical method of Gas Path Analysis (GPA). The method, built on GPA, allows to isolate faulty measurements. The method repeatedly estimates degradation from a set of measurement values. By systematically excluding measurement values from the calculation, differing estimations are evoked which indicate faulty measurement sets. The procedure also allows to distinguish between state changes and measurement errors in an easy fashion.

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