Future horizontal axial wind turbines that approach the 10MW capacity will have a rotor diameter somewhere in the order of 170m. Their loads could be much higher and their blades more flexible compared to current multi-MW wind turbines, most probably resulting in aeroelastic instabilities not commonly seen in the machines of today. The likely design drivers for future 10MW+ wind turbines are fatigue life and aeroelastic stability. To help improve the fatigue life and the aeroelastic stability, load control could be applied to future wind turbines. This paper concerns the load control concept of an actuated trailing edge flap (TEF), focusing on the effects they have on the aeroelastic stability of a blade. In particular, the two degree of freedom Flap-Torsion Flutter instability-Classical Flutter-is studied.