Considering either the left or the right wing of the airplane, the mass moment of inertia about the elastic axis and the chordwise location of the center of mass (measured from the leading edge) change from Ip = 7 kg.m2 and 0.35c at the maximum take-off weight to Ip = 4 kg.m2 and 0.45c at the empty weight, respectively; c being the chord length. Nevertheless, the chordwise location of the elastic axis remains unchanged at 0.4c. Each wing carries 80 kg of fuel. The wing has a bending rigidity of EI = 2 105 N.m2 and a torsional rigidity of GJ = 105 N.m2