57-11-00
 ALL  ú ú B01 Page 1 ú Oct 20/83
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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A
737-300/400/500MAINTENANCE MANUAL
 WING RIBS - DESCRIPTION AND OPERATION
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General
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 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 the tank (Fig. 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.
Standard Ribs
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 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.
Special Ribs
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 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.
Rib Access Openings
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 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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 57-12-00
 ALL  ú ú B01 Page 1 ú Oct 20/83
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

WING ROOT RIB
LANDING GEAR SUPPORT BEAM
Wing Ribs
Figure 1

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 57-12-00
 ALL  ú ú B01 Page 2 ú Oct 20/83
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 WING STRINGERS - DESCRIPTION AND OPERATION
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 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 owner 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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