Description and Operation 1 ALL General 1 Flight 1 Ground 1
SPOILERS - FLIGHT 57-57-02
Description and Operation 1 ALL General 1 Structure - Inboard 1 Structure - Outboard 3
SPOILERS - GROUND 57-57-01
Description and Operation 1 ALL General 1 Structure 1
57-CONTENTS
GUN Page 5 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
WINGS - DESCRIPTION AND OPERATION
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1. General (Fig. 1)_______
A. The wing surfaces develop aerodynamic forces for supporting the airplane in flight. The wing also stores fuel for flight, houses fuel system equipment, provides support for the engines, and contains the flaps, spoilers, and ailerons. A lightning strike diverter and static dischargers are attached to the wing tip. The wings are swept back at
37.5 degrees and are of semi-monocoque construction. The right and left wings are joined by the wing center section which passes through the lower lobe section of the fuselage.
B. Location references on the wing are usually indicated by a distance in inches from a base point along a specific reference line. The main reference lines for designating locations on the wing are the rear spar, inboard leading edge, and the outboard leading edge. Wing stations (WS) are measured along the rear spar while the leading edge references are indicated by inboard leading edge stations (INBD LES) and outboard leading edge stations (OUTBD LES). Another location reference used on the wing is the distance from the center line of the fuselage designated as wing buttock lines (WBL). See Fig. 1 for diagram of basic reference points and location of station O. Refer to Chapter 6, Wing Station Diagram, for principal dimensions and additional design data.
C. The structure of the wing consists basically of the left wing box, the center wing box, and the right wing box. This structure comprises the main frame of the wing. 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. The wings are permanently attached to the fuselage.
D. 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 ribs at BBL 127.75 to the removable winglets. 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. A chordwise rib at BBL 127.75 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-to-body rib and two spars, which are connected by means of flanged fittings.
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