As the flaps are retracted, the outboard aileron control system is “locked out” and fairs with the basic wing shape. The outboard ailerons become active whenever the flaps are extended beyond a fixed setting. Large jet aircraft often employ two sets of ailerons, one set being approximately mid wing or immediately outboard of the inboard flaps, and the other set being in the conventional location near the wing tips. They are usually mounted on the trailing edge of the wing near the wing tip. These structures are often sealed from the atmosphere and therefore do not include drainage openings in their designĪilerons are primary flight control surfaces utilized to provide lateral (roll) control of aircraft that is they control aircraft movement about the longitudinal axis. 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.
#Types of flight control system skin
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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