FUSELAGE SECTION 42
Center Fuselage, Sections 42, 44 and 46
Figure 1 (Sheet 1)
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A
747-400
MAINTENANCE MANUAL
PRESSURE BULKHEAD STA 2360
MAIN DECK FLOOR
LOWER
Center Fuselage, Sections 42,44 and 46
Figure 1 (Sheet 2)
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C82269
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747-400 MAINTENANCE MANUAL
STA 1000
STA
1480
STA
1241
KEEL BEAM
CENTER WEB
DRAG STRUT TO
KEEL BEAM
ATTACH FITTING
AIRPLANE
STA 1241
REAR SPAR
BULKHEAD
FITTING KEEL BEAM
BOX
REAR SPAR WEB
KEEL BEAM
CHORDS
BODY BULKHEAD FRONT SPAR FRAME (EXAMPLE) FAIRING SUPPORT
1241 STA FWD
CHORDS KEEL BEAM
Keel Beam
Figure 2
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MAINTENANCE MANUAL
3. Bulkheads (Fig. 1)
________
A. Section 42 contains no bulkheads. Section 44 contains five bulkheads: the forward four are of the reinforced frame type. Station 1000 bulkhead attaches to the wing center section forward spar with fittings spliced into the lower portion of the frame. The portion of this bulkhead below the wing center section forward spar is canted the same as the forward spar and forms a flat pressure surface between the forward cargo compartment and the air conditioning compartment. Station 1140 and 1241 bulkheads are of a similar design except that they splice into, respectively, the wing center section mid spar and wing center section aft spar. Station 1350 bulkhead is a typical bulkhead with stiffeners and a flap machined web across the area between the wind landing gear well and the body landing gear well. It is attached to the landing gear bearm at the outboard ends. Station 1480 bulkhead is a typical bulkhead with stiffeners and flat webs across the area between the lower fuselage contour and the main deck. This area forms a pressure surface between the aft cargo compartment and the main body gear wheel well and also provides the aft wall to the main landing gear wheel well and the torque boxes. There are no bulkheads in section 46.
4. Stringers
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A. Fuselage stringers are the longitudinal primary structure members extending the length of the airplane, interrupted only by production breaks, bulkheads, and structural openings. The stringers in the fuselage center section are typically of aluminum alloy and are hat-sections. Attachment of the stringers is with shear head rivets to the skin and with modified H-section clips to the frames.
B. Stringers in the upper one-fourth of section 42 are of formed hat-section construction from uniform thickness sheet. Stringers in the lower three-fourths of section 42 are formed from sheets of varying thicknesses; the thickness determined by local stress levels. The upper stringers in section 44 are formed from heavy sheet of varying thicknesses; basic thickness is reduced as the stringers circumferentially approach the wing. In section 46, the side stringers are formed from a medium gage sheet with varying thicknesses; and the stringers in the crown (top) are from a heavy sheet of varying thicknesses. The lower stringers in section 46 are machined from extrusions with thicknesses tapered as required to meet structural requirements.
5. Floor-to-Skin Shear Ties
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