How do you design and implement active gust load alleviation systems?

Gust load alleviation (GLA) uses control surfaces to reduce structural loads from gusts. Design approach: Characterize gust environment (1-cos model, von Karman PSD), Develop aeroelastic model coupling structure and aerodynamics, Design control law using wing or fuselage sensors (accelerometers, air data) to drive symmetric control surfaces (spoilers, ailerons, elevators), Optimize for load reduction while maintaining handling qualities, and Analyze robustness to model uncertainty and failures. Benefits: 10-15% wing weight reduction or increased span, Improved passenger comfort, and Reduced fatigue damage. Challenges: Actuator bandwidth requirements, Structural mode interaction, and Certification of safety-critical active system. GLA systems operational on A350, 787, and in development for next-generation aircraft. Integration with maneuver load alleviation for maximum benefit.