The invention relates to a method of lightening and protecting loads of an airfoil (104) of an aircraft (100) having an acceptable deformation tolerance interval for said airfoil (104), said airfoil (104). ) comprising a control surface (106), a maneuvering system for moving the control surface (106), a distal sensor (110) and a proximal sensor (112) which measure a dimensional characteristic related to the deformation of the airfoil (104). The method assigns a first value to a stress attribute if the airfoil (104) is not under controlled stress and a second value if the airfoil (104) is under controlled stress, acquires characteristic data related to the stress. deformation of the airfoil (104), determines a value characterizing a deformation, analyzes the value of the stress attribute, compares the value characterizing the deformation to the values of the tolerance interval associated with the airfoil (104), and if the value characterizing the deformation is out of the range, the process triggers an activation of the maneuvering system to move the control surface (106) from an initial position in order to lighten the loads on the bearing surface (104).
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