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 B.  Major components of the wing box beams are front spar, mid spar, rear spar, inspar ribs, shear tie ribs, tank end ribs, upper and lower stringers, and upper and lower skin panels.
 3.  Center Wing Box Beam (Fig. 1)____________________
 A.  The structure of the center wing box beam consists of front spar, mid spar, rear spar, spanwise beams No. 1, 2, and 3, intercostals, stabilizing angles, fairing beam chords, keel beam chords, buttock line 0 rib between the mid spar and rear spar, and upper and lower skin panels. The center wing box beam is sealed to provide a fluid- tight compartment for fuel storage.
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 57-10-00
 ALL  ú ú 02 Page 1 ú Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

BBL 127.75

SPANWISE BEAMS (3 LOCATIONS)
MID SPAR

AIRPLANES WITH GE ENGINES HAVE A DRY BAY BETWEEN THE MID SPAR AND THE FRONT SPAR
Wing Main Frame Figure 1
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 57-10-00
 ALL  ú ú 01 Page 2 ú Oct 18/01
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 1.

2.

3.

4.

A
747-400 MAINTENANCE MANUAL
 WING SPARS - DESCRIPTION AND OPERATION
______________________________________
General (Fig. 1)
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 A.  The front, mid, and rear wing spars are primary spanwise structural components of the main frame. The outboard wing spars are joined to the respective center wing spars by flanged fittings at the BBL 127.75 rib (Ref 57-41-00, Description and Operation). The front and rear spars are sealed in the areas that are to serve as sides of the integral fuel tanks.
 B.  The spars provide load carrying attachment for wing-mounted components consisting of engine support fittings, landing gear beams, and the trailing edge beams. In addition, hinge supports, transmission assemblies, actuators, and gear box mounts associated with the flight controls are attached to the spars.
Front Spars (Fig. 1)
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 A.  The front spar consists of two wing extension sections, two outboard wing sections, and a center wing section joined at wing extension join rib and the wing-to-body rib respectively.
 B.  The outboard wing front spars are beams which consist of an upper chord angle, web, and lower chord angle. The spars taper down in depth toward the wingtip and are spliced at front spar station 1446. vertical stiffeners, attached to both faces of the spar web, provide means of attaching the wing inspar and leading edge ribs. The center wing front spar consists of constant depth vertical web and angle chords which also serve as a structural part of the bulkhead at body station 1000. Vertical stiffeners attached to the web and chords provide additional rigidity.
Mid Spars (Fig. 1)
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 A.  The mid spar consists of two outboard sections and a center section joined at the wing-to-body rib by flanged fittings. The mid spar extends outboard to WBL 834.
 B.  Each mid spar consists of a one-piece web, plus upper and lower tee-chords and web stiffeners. Fifteen access openings are provided in each outboard mid spar web and two access openings covered by removable doors are provided in the center wing mid spar web.
Rear Spars (Fig. 1)
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 A.  The rear spar consists of two wing extension sections, two outboard wing sections, and a center wing section joined at the wing extension join rib and wing-to-body rib respectively.
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 57-11-00
 ALL  ú ú 01 Page 1 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

AIRPLANE SYM

Wing Spar
Figure 1 (Sheet 1)

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