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Fuselage Structure (Example) Figure 1 (Sheet 1)
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747-400
MAINTENANCE MANUAL

FRAME (EXAMPLE)
STRINGER (EXAMPLE)
FRAME
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SKIN FLOOR-TO-SKIN SHEAR TIES
FLOOR BEAM
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Fuselage Structure (Example) Figure 1 (Sheet 2)
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747-400
MAINTENANCE MANUAL

Door Reinforcement
Figure 2

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747-400 MAINTENANCE MANUAL
 NOSE SECTION: STATION 90 TO STATION 520 - DESCRIPTION AND OPERATION
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General (Fig. 1)
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 A.  The fuselage nose section, section 41, consists of the fuselage between station 90 and the production break frame at station 520. The nose radome, forward of station 134.12, houses weather radar and navigation equipment. The control cabin and the forward end of the main and upper decks are all part of the nose section. The main deck accommodates cargo. The upper deck consists of the control cabin, aft of which is the crew area. A crew compartment overhead hatch is located in the upper left ceiling.
 B.  The lower lobe houses the main electrical/electronics compartment. Access is gained through a door immediately aft and to the left of the nose landing gear well. The nonpressurized nose gear wheel well is covered by four doors of metal bond construction. The forward containerized cargo compartment has its beginning aft of electrical/electronics compartment.
Frames (Fig. 2)
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 A.  The frames are channel section members, primarily of aluminum alloy, that form the cross-sectional shape of the body and carry pressure loads. They are shear tied to the skin (detail C, sheet 2). Spacing is generally 20.0 inches. Depth of the frames varies but typical depth is
 6.0 inches in the main deck area, 8.0 inches in the upper deck area, and increased to a depth in the lower lobe to provide support for the cargo floor. The floor beams are attached to the frames at WL 199.8 and WL
 307.5 and absorb the normal loads of seat tracks and floor panels plus
 the tension loads due to cabin pressurization.Bulkheads (Fig. 1)
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 A.  The nose section contains four bulkheads. The forward pressure bulkhead, located at station 140, consists of a forward and aft ring and a flat web reinforced by seven horizontal and one vertical beam. The canted bulkhead intersects the lower airplane surface at approximately station 240 then angles up and back, forming the forward end of the nonpressurized nose gear wheel well. The bulkhead at station 340 forms the aft end of the large cavity for the nose wheels; and the station 400 bulkhead forms the aft end of the small cavity for the nose gear. The bulkheads at stations 240, 340, and 400 are composed of beams, flat webs, and doublers to support the loads imposed by the nose landing gear.
Stringers (Fig. 2)
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 A.  The section 41 fuselage stringers are longitudinal primary structural members that extend aft from body station 140 pressure bulkhead to the station 520 production break, interrupted only by structural openings. These stringers are formed sections of aluminum alloy. Stringers pass through cutouts in frames to allow for shear tie frame construction and are typically attached to the skin by shear head rivets. Stringers are attached to frames by angle shaped and tee shaped clips. Stringers are typically spaced approximately seven to ten inches apart. Stringers provide fail- safe construction by acting as circumferential skin tear stoppers.
　
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