PURPOSE: To dispense with the control angle change of an aircraft even in the case of the airframe weight being changed by the presence of exterior equipment.

CONSTITUTION: External equipment 5 is mounted in close contact in the position of the fuselage upper face 3 on the upper side of the main wing reference face 2 of an aircraft 1 in which a Mach cone does not intersect the main wing whichever point of the outline becomes an apex, and exterior equipment 6 is mounted in close contact in the position of the fuselage lower face 4 where a Mach cone intersects the main wing at least at one point whichever point of the outline becomes an apex. Appropriate lift and pitching moment can be thereby obtained to weight change caused by the presence of the exterior equipments 5, 6, and control angle change due to the presence of the exterior equipments is dispensed with.