Before revision: Aircraft are designed to avoid the following aeroelastic problems: divergence where the aerodynamic forces increase the angle of attack of a wing which further increases forces; control reversal where control activation produces an opposite aerodynamic moment that reduces, or in extreme cases reverses, the control effectiveness; and flutter which is uncontained vibration that can lead to the destruction of an aircraft.
After revision: Aircraft are designed to avoid the following aeroelastic problems: divergence where the aerodynamic forces increase the twist of a wing which further increases forces; control reversal where control activation produces an opposite aerodynamic moment that reduces, or in extreme cases reverses, the control effectiveness; and flutter which is uncontained vibration that can lead to the destruction of an aircraft.