Caisson is a power of the wing and other elements of the airframe. This beam-type structure with front and back walls, top and bottom - stressed skin. His trim takes the tangent and the normal stress. Basically, the bending moment is seen stringers and skin. The caisson longitudinal strength members may serve spars having a weakened zone. Caisson is the most common type of aircraft structures (wings and other elements).
The very design of caisson - a special case of a monobloc-wing (mainly bending moment is perceived by plating and stringers). In such designs spars may be completely absent or have weak zones, which are comparable with the cross section of the stringers.
It should be noted that the ribs are installed much more frequently than in the wing spar. With regard to the bending moment, it is seen that part of the circuit. The tail part of the sock and do not usually involved in the perception of the basic loads, and their operational and technological reasons make removable - often located inside the harnesses, pipes, various components and assemblies. Wing box structure is characterized by volumes that are sufficient to accommodate a fuel or other units. In the first case all the space caisson necessarily sealed kerosinostoykimi sealants - threaded connections, joints, riveting, which eliminates fuel leakage.
The advantages of the monoblock scheme should include high strength, vitality, and less weight as opposed to the wing spars.
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