57-13-00
 ALL  ú ú B01 Page 1 ú Oct 20/83
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 CENTER WING BOX - DESCRIPTION AND OPERATION
___________________________________________
 1.  General_______
 A.  The center wing box is part of the wing main frame. Its main functions are to support the fuselage, to act as the structural part from which the wing boxes are cantilevered and to accommodate the integral center fuel tank.
 2.  Center Wing Box Structure_________________________
 A.  The surfaces of the center wing box consist of the front and rear spars, the two wing root ribs at BL 70.85, and the upper and lower skins. The front and rear spars combine with the bulkheads at body stations 540 and
 664. The skins are attached to a series of Z-section stringers. The center wing box skins are spliced with the left and right wing box skins. In contrast to the wing boxes, the center wing box has no reinforcing chordwise ribs. Instead, the reinforcement consists of a pair of spanwise beams which are stiffened webs attached to the lower and upper skins. The center wing box fits into a cutout section of the fuselage between body stations 540 and 664. A chordwise vertical keel beam is attached to the lower skin.
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 57-14-00
 ALL  ú ú B01 Page 1 ú Oct 20/83
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 LANDING GEAR SUPPORT BEAMS - DESCRIPTION AND OPERATION
______________________________________________________
 1.  General_______
 A.  The landing gear support beams are two-piece I-section forgings bonded and bolted together, and connected at their outboard ends to the left and right wing rear spars and at their inboard ends to the left and right sides of the fuselage.
 2.  Landing Gear Support Beam Structure___________________________________
 A.  Each beam is connected to the side of the fuselage by a short swinging link whose upper end is hinged from fuselage fittings at body stations 695 and 706, and whose lower end is hinged to the beam slightly outboard of its inboard end. Each landing gear support beam is connected at its ouboard end to the aft face of the wing rear spar, by a single pin in a heavy forged fitting. These connections at each end of the beams allow them to transmit landing loads into the wing and fuselage. The forward end of the inboard flap inboard track is attached to a fitting on the inboard end of the beam. Several ribs supporting the inboard spoiler are attached to the aft face of the beam. Slightly inboard of its midpoint the beam incorporates a bearing for the aft end of the main landing gear trunnion.
FRAME, BODY STA 706
STUB FRAME, BODY STA 695
FRAME, BODY STA 685
LINK SUPPORT BEAM TO BODY FRAME
MAIN LANDING GEAR SUPPORT BEAM
INBD
FWD
Landing Gear Support Beam
Figure 1

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 57-15-00
 ALL  ú ú B01 Page 1 ú Oct 20/83
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 LANDING GEAR SUPPORT BEAM - REMOVAL/INSTALLATION
________________________________________________
 1.  General_______
 A.  There are two tasks in this procedure. There is one task for the removal and one task for the installation of a landing gear support beam.
 (1)  
The removal procedure has these parts:

 (a)  
The removal of the fuel from the airplane

 (b)  
An extension of the trailing edge flaps

 (c)  
The removal of one main landing gear

 (d)  
The removal of the main gear wing door

 (e)  
The removal of the flap track fairing

 (f)  
The removal of a landing gear support beam.

 (2)  
The installation procedure has these parts:

 (a)  
The installation of a landing gear support beam

 (b)  
The installation of the flap track fairing
　
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