The #mu# method for flutter analysis is extended to compute stability margins of aeroservoelastic dynamics. This method uses flight data to determine operators which describle errors in a model. The resulting stability margins directly account for these errors to compute a worstcase range of the flight conditions for which the aircraft is guaranteed to be free of aeroservoelastic instabilities. The #mu# method is used to analyze an F/A-18 aircraft and demonstrate the stability margins of the nominal dynamics are quite large; however, accounting for modeling errors can dramatically reduce the stability margins.
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