![]() ![]() Some aircraft are using composite and bonded structures which include the use of honeycomb internal components. Methods of joining the components may include metal fasteners as well as adhesives and bonding agents. Each of these types of construction is treated by some method to inhibit the deterioration of the structure and the covering and includes drain holes to prevent water from becoming trapped inside the structure and causing the control surfaces to be thrown out of balance. Where it is necessary to attach tabs to the trailing edges of control surfaces, additional structure is added to provide for transmission of the tab loads to the surface.Ĭontrol surfaces may be constructed of any combination of materials, with the more common combination being a sheet metal structure (usually an aluminium alloy) covered with metal skin or fabric, a steel structure covered with fabric, or a wood structure covered with plywood or fabric. Hinges for attachment are also secured to the spar. They often have a spar at the forward edge to provide rigidity and to this spar are attached the ribs and the covering. ![]() The construction of the control surfaces is similar to that of the stabilizers however, the movable surfaces usually are somewhat lighter in construction. Secondary control surfaces include tabs, flaps, spoilers, and slats. ![]() The primary control surfaces of an airplane include the ailerons, rudder, and elevator. ![]()
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