FLIGHT SURFACES ...................................................................................................... 57-50-0
Description and Operation
Ailerons
Leading Edge Flaps
Leading Edge Slats
Spoilers
Trailing Edge Flaps
AILERONS .................................................................................................................. 57-51-0
Description and Operation
Ailerons
Aileron Balance Tabs
TRAILING EDGE FLAPS............................................................................................ 57-52-0
Description and Operation
Aftflap
Foreflap
Midflap
LEADING EDGE FLAPS............................................................................................. 57-53-0 Description and Operation
LEADING EDGE SLATS............................................................................................. 57-54-0 Description and Operation
SPOILERS .................................................................................................................. 57-55-0
Description and Operation
Flight Spoilers
Ground Spoilers
505
May 15/68 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Contents 57 Page 3
WINGS - DESCRIPTION AND OPERATION
1. General
A. The structure of the wing between left and right tips consists basically of the left wing box, 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 plan view, both wings sweep back from the center wing box. See Fig. 2 for wing cross sections. Refer to Chapter 6, Dimensions and Areas, for reference concerning station numbers.
B. The surface s 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 volume 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.
576 Wing Structure
Feb 15/79 Figure 1 57-00
Page 1
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
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 exists between the wing and the fuselage by means of six-flanged chords running between the bukheads 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.
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 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 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.
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