WING RIBS - DESCRIPTION AND OPERATION
1. General
A. The two wing root ribs form the inboard ends of the left and right wing boxes and the outboard ends of the center wing box. Each wing root rib consists of a solid stiffened web. At its forward and aft ends, each wing root rib is attached to the wing front and rear spars by means of the three-flanged terminal fittings. The wing root ribs form the inboard ends of the integral sections of fuel tank No. 2, and ports in their webs provide the connections into the central bladder cell sections of that tank. (See figure 1.)
B. Outboard of the wing root rib, on each wing, the ribs until wing buttock line 355.0 are parallel to the airplane centerline. The ribs at wing buttock lines 254.0 and 355.0 support the forward ends of the outboard flap tracks.
C. Outboard of wing buttock line 355.0 the ribs lie at an angle normal to the wing rear spar. The two spaces between the ribs at wing stations 531 and 583 constitute a surge tank.
2. Standard Ribs
A. The structure of a typical rib consists of a web, reinforced by stiffeners and, in some instances, provided with a reinforced opening. Along the upper and lower edges of the web, an angle chord member attaches the rib to the edges of the continuous wing stringers, and at its forward and aft ends the rib web is attached to the webs of the front and rear spars.
3. Special Ribs
A. The ribs forming the ends of fuel tanks differ from other ribs in that their webs extend to join the inside surfaces of the wing skin panels between the stringers.
B. The wing ribs in the integral tanks act as baffle plates to prevent excessive fuel surges. Some of the wing ribs contain a series of baffle check valves to prevent fuel flow away from the fuel boost pumps.
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4. Rib Access Openings
A. Access to some of the equipment located inside the fuel tanks is not directly possible through the fuel tank access panels. To obtain access to this equipment, personnel must enter the tank through the nearest access panel and go through rib access openings into the areas between ribs where no access panel is provided. See Fuel, Chapter 28.
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BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
WING STRINGERS - DESCRIPTION AND OPERATION
1. General
A. The upper and lower left and right wing skin panels are reinforced by a series of spanwise stringers. These are zee-section extrusions attached to the inside of the skin panels. As the wing structure has no production joints, many of the stringers extend continuously from the wing root rib to the wing tip, and others extend as far outboard as the tapering shape of the wing will allow. The lower edges of the upper stringers and the upper edges of the lower stringers are attached to the edges of the wing ribs. Some stringers are part of the vent system.
B. The upper and lower center wing box skin panels are reinforced by a similar series of spanwise stringers.
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CENTER WING BOX - DESCRIPTION AND OPERATION
1. General
A. The center wing box is part of the wing main frame. Its main functions are to support the fuselage, to act as the structural part from which the wing boxes are cantilevered and to accommodate the integral center fuel tank.
2. Center Wing Box Structure
A. The surfaces of the center wing box consist of the front and rear spars, the two wing root ribs at BL 70.85, and the upper and lower skins. The front and rear spars combine with the bulkheads at body stations 540 and 664. The skins are attached to a series of Z-section stringers. The center wing box skins are spliced with the left and right wing box skins. In contrast to the wing boxes, the center wing box has no reinforcing chordwise ribs. Instead, the reinforcement consists of a pair of spanwise beams which are stiffened webs attached to the lower and upper skins. The center wing box fits into a cutout section of the fuselage between body stations 540 and 664. A chordwise vertical keel beam is attached to the lower skin.
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