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 B.  The wing, as a single unit consisting of the left and right wing boxes and the center wing box is attached to the fuselage frames at body stations 540 and 664 in such a manner that the center wing box front and rear spars combine with the bulkheads at body stations 540 and 664. Another wing-to-fuselage connection is by means of the longitudinal upper flanged chords at left and right buttock lines 70.85. The center wing box skin, the wing box skin, the wing root rib and the fuselage skin attach to these flanged chords on both sides of the airplane (Fig. 1). Other points of attachment are the main landing gear support beams, the keel beam and the longitudinal floor beams above the center wing box.
 C.  The primary structure of the wing is the structural components of the main frame. All other wing structures, such as leading edge, trailing edge, control surfaces and wing tips are auxiliary.
Wing Boxes
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 A.  Important components of the structure of each wing box are the front and rear spars, the ribs, the upper and lower skins, and their reinforcing stringers (Fig. 2).
Center Wing Box
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 A.  The structure of the center wing box consists of front and rear spars, two spanwise beams, upper and lower skin panels, and reinforcing stringers.
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 57-10-00
 ALL  ú ú B01 Page 1 ú Oct 25/84
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
BBL
70.85

LOWER SKIN
Wing to Fuselage Attachment
Figure 1

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 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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
TO BE FURNISHED

Wing Inspar Structure
Figure 2

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 1.

2.

3.

A
737-300/400/500MAINTENANCE MANUAL
 WING SPARS - DESCRIPTION AND OPERATION
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General
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 A.  The front and rear wing spars on the left and right wing boxes are primary structural components of the main frame. They extend from the wing root rib to the wing tip. Engine support fittings, hinge supports, transmission assemblies, actuators and gearbox mounts associated with the flight controls are attached to the spars. See Flight Controls, Chapter 27, and Power Plant, Chapter 71.
 B.  The inboard ends of the wing spars are points of attachment of the wing boxes to the center wing box. The three-flanged fitting described in 57-41-00 is the means of attachment.
 C.  A main feature of the rear spar is the forged fitting to which the main gear landing beam attaches. The integral fuel tanks providing the major portion of the fuel supply storage capacity are located between the wing front and rear spars.
Wing Front Spars
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 A.  The left and right front spars consist of vertical webs tapering down in depth towards the wing tips, and provided with tee-section chords along their upper and lower edges. Vertical stiffeners are attached to the forward face of each spar web. The inboard ends of the left and right front spars are attached to the front spar of the center wing box and the wing root ribs by means of a three-flanged terminal fitting.
 B.  Along the outboard section of the aft face of the front spars, a series of housings are provided to allow the leading edge slat guide rails and actuators to protrude through holes in the spar web. The forward outboard engine support fitting is attached to the front spar.
Wing Rear Spars
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 A.  The left and right rear spar upper and lower edge chord members are angle-sections, the flange projecting forward only, and the vertical stiffeners are attached to the aft face of the web. The inboard ends of the left and right rear spars are attached to the rear spar of the center wing box and the wing root ribs by means of a three-flanged terminal fitting.
　
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