A two-dimensional aeroservoelastic study in the time domain is described. The model, based on exact inviscid aerodynamics, correctly represents the large amplitude motions and the associated strong shock dynamics in the transonic regime. The aeroservoelastic system consists of a two-degree-of-freedom airfoil with a trailing-edge control surface. Active e utter suppression in the presence of nonlinear aeroelastic phenomena is achieved using e rst-order actuator dynamics and a digital adaptive controller. A relation between actuator dynamics and limits on the e ap dee ection angle to guarantee the effectiveness of the adaptive controller is illustrated by the results. Hingemomentcalculationsandpowerrequirementsfore uttersuppressionarealsocarriedout. Aeroelasticscaling requirements for the governing parameters, including actuator moment and control power, are established.