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A 737-300/400/500MAINTENANCE MANUAL
STA 1217

NOSE WHEEL  TO BODY. PRESSURE BULKHEAD 
WELL  (LOWER LOBE). MANUFACTURING 
BREAK 

Major Fuselage Components
Figure 1

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A 737-300/400/500MAINTENANCE MANUAL

APU Compartment
Figure 2

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A
737-300/400/500MAINTENANCE MANUAL
 MAIN FRAME - DESCRIPTION AND OPERATION
______________________________________
 1.  General_______
 A.  The main frame includes frames, bulkheads, formers, longerons, stringers, keel and frames around openings. The fuselage structure is semimonocoque.
 B.  The primary structure is that which is essential to the integrity of the airplane. The primary structure is the main frame, and includes floor beams and skin.
 2.  Primary Structure_________________
 A.  The frames and the bulkheads are primary structural components of the fuselage. Each frame is a zee-section circumferential member carrying pressure loads in hoop tension. The frames are generally spaced at twenty-inch intervals along the fuselage. The bulkheads consist of webs that fit the sectional contours of the airplane. These bulkheads are reinforced by beams attached to the webs.
 B.  The floor beams are primary structural components of the fuselage. Each floor beam carries a tension load and is attached at its ends to a frame.
 C.  The stringers are primary members. They are hat-section which extend longitudinally along the fuselage. Other longitudinal members considered primary are the crease beams and the keel beams.
 D.  Skin and reinforcing structure around opening is primary. Basic
 structure associated with the wheel wells is primary.

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A
737-300/400/500MAINTENANCE MANUAL
 FRAMES AND BULKHEADS - DESCRIPTION AND OPERATION
________________________________________________
 1.  General_______
 A.  A typical fuselage frame is illustrated in Fig. 1. Each frame is a zee-section circumferential member, with increased web depth at floor level. The frames are generally spaced at twenty-inch intervals along the fuselage.
 B.  The bulkhead at body station 178 is the forward end of the pressure cabin, and is composed of four vertical beams and a flat pressure web which the beams divide into small panels.
 C.  At body station 227.8, a frame with a web extending across the lower part is installed. The web forms the forward wall of the nose landing gear wheel well. At body station 294.5, another frame with a web extending across the lower part is installed. This web forms the aft wall of the nose landing gear wheel well.
 D.  At body station 259.5 a frame with increased web depth, marks the aft end of the control cabin. The transverse floor beam at body station 259.5 lying across the top of the nose landing gear wheel well ceiling has its web extended downward between the fuselage skin and the nose landing gear wheel well sidewalls. The end of the control cabin is at station 270 partition.
 E.  At body station 360, a bulkhead extends across the fuselage from floor level and down to form the forward wall of the forward cargo compartment.
　
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