57-13-00
 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

OUTBOARD WING STRINGERS B-B
Wing StringersFigure 1
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 57-13-00
 ALL  ú ú 01 Page 2 ú Jun 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 CENTER WING BOX BEAM - DESCRIPTION AND OPERATION
________________________________________________
 1.  General_______
 A.  The center wing box beam, part of the wing main frame, functions to support the fuselage, to serve as an integral fuel tank, and to support the cantilevered outboard wing box beams.
 2.  Center Wing Box Beam Structure (Fig. 1)______________________________
 A.  The forward, aft, upper, and lower surfaces of the center wing box beam are formed by the front and rear spars and upper and lower skin panels. The outboard sides of the center wing box beam are formed by the wing-to-body rib (Ref 57-12-00, Description and Operation). The skin panels are reinforced with spanwise stringers, and are spliced to the outboard wing skins, forming an integral beam. In contrast to the outboard wing boxes, the center wing box does not utilize chordwise ribs, except for a partial rib at BLO. Instead, the box is reinforced by a mid spar and three spanwise beams with stiffened webs which attach to the upper and lower skins. Other structural components and attachments consist of the vertical keel beam, intercostals, stabilizing angles, fairing beams, and fuselage floor beams.
 3.  Center Wing to Fuselage Attachments (Fig. 1)___________________________________
 A.  The center wing box beam fits into a cutout section of the fuselage where the front, mid, and rear spars form an integral part of body bulkheads at stations 1000.0, 1140.0, and 1241.0 respectively. Another wing-to-fuselage attachment is by the flanged upper and lower chords and frame fittings at left and right WBL 127.75. Other points of attachment include the keel beam and the longitudinal floor beams.
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 57-14-00
 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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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

1 
1 BL 
O 
RIB 
BODY 
STATION 
1265 
FLOOR BEAM 
RBL 
127.75 
LBL 
127.75 
REAR 
SPAR 
SPANWISE 
BEAM NO. 1 
MID SPAR 
BODY 
FITTING 
SPANWISE BEAM NO. 2 
BODY 
STATION  KEEL  INTERCOSTAL 
984  BEAM  SPANWISE BEAM NO. 3 
FAIRING BEAM CHORDS  FRONT SPAR 

1 ON PASSENGER AIRPLANES ONLY
Wing Center Section Figure 1
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 57-14-00
 ALL  ú ú 01 Page 2 ú Jun 10/94
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 LANDING GEAR SUPPORT BEAMS - DESCRIPTION AND OPERATION
______________________________________________________
 1.  General_______
 A.  The support beam for the landing gear is made of two titanium I-beams connected together. The outboard end makes a rigid connection to the wing rear spar at wing station 586 by a one pin connection. The inboard end also makes a rigid connection to the fuselage at body station 1350. A trunnion fitting is in the middle and transmits aft main landing gear loads. The loads go through the beam to the wing spar and to the fuselage structure.
　
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