Assembly and Rigging If a pilot reports that an airplane flies left wing heavy, this condition may be corrected by a. increasing the angle of incidence of the left wing, or decreasing the angle of incidence of the right wing, or both. b. increasing the dihedral angle of the left wing, or decreasing the dihedral angle of the right wing, or both. c. adjusting the dihedral angle of the left wing so that differential pressure between the upper and lower wing surfaces is increased.