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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 WINGS - DESCRIPTION AND OPERATION
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 1.  General_______
 A.  The structure of the wing between left and right tips consists basically of the left wing, the center wing box, and the right wing box (Fig. 1). The left and right wing boxes are similar in structure. The left and right wing boxes are cantilevered from the center wing box which carries, and is enclosed within the fuselage. The thickness and chord of each wing tapers down toward the tip and, in plain view, both wings sweep back from the center wing box. Refer to Fig. 2 for wing cross sections. Refer to Chapter 6, Dimensions and Areas, for reference concerning station numbers.
 B.  The surfaces of the wing boxes and the center wing box consist of upper and lower skin panels and front and rear spars. The left and right wing boxes extend from the wing root ribs at WBL 70.85 to the removable wing tips. Throughout the left, center and right wing boxes, the skin panels are reinforced by spanwise stringers, and the spars are reinforced by vertical stiffeners. The left and right wing boxes are reinforced by a series of chordwise ribs, and the greater part of their enclosed volumne is sealed to serve as fuel tanks. The center wing box is reinforced by spanwise beams, and contains an integral center fuel tank (Ref Chapter 28). A chordwise rib (the wing root rib) at BBL 70.85 constitutes the inboard end of the left wing box. This same rib is the left outboard end of the center wing box. An identical arrangement exists on the right side of the airplane. At each of the four corners of the center wing box, three members meet. These are the wing root rib and two spars, which are connected by means of a three-flanged terminal fitting. Longitudinal floor beams are attached to the upper skin of the center wing box.
 C.  A connection exist between the wing and the fuselage by means of six-flanged chords running between the bulkheads at body stations 540 and 664 and at buttock line 70.85 along the upper edges of the wing. A wing-to-fuselage connection exists between the lower surface of the center wing box and the fuselage keel beam which passes beneath it.
 D.  The bulkhead at body station 540 combines with the center wing box front spar, and the bulkhead at body station 664 combines with the center wing box rear spar. The upper front and rear and the lower front and rear spanwise wing-to-fuselage connections are rigid.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
 E.  On each wing, the leading edge structure is cantilevered forward of the wing front spar. The trailing edge structure and control surfaces are cantilevered aft of the wing rear spar and supported additionally at the inboard end of the wing by the spoiler support beam and the landing gear support beam. The landing gear support beam is attached at its inboard end to the fuselage frame at the center of the main wheel well and at its outboard end to the rear face of the wing rear spar. A bearing approximately midway along the landing gear support beam, together with one forward of it on the wing rear spar, form the axis of main landing gear rotation and are the points at which landing loads are transmitted to the wing structure. The wing-to-body fairing is attached to the upper and lower surfaces of the wing.
 F.  Five control surfaces are supported by the leading edge structure of each wing: two flaps are hinged from the inboard one-third of the wing span, and along the outboard two-thirds three extendable slats are installed. The control surfaces along the trailing edge of each wing consist of inboard and outboard flaps, an aileron and a total of five spoilers.

Wing Structure
Figure 1

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

FLAPS RETRACTED

LEADING EDGE FLAP
RETRACTED

LANDING FLAPS

Wing Cross Sections
Figure 2

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