(2)
Section 43 is that part of the fuselage between body stations 360 and 540. Above the floor it encloses the forward half of the passenger cabin. Below the floor it encloses the forward cargo compartment whose door is on the lower right side of the fuselage.
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(3)
Section 46 is that part of the fuselage between body station 540 and the rear pressure bulkhead at station 1016. The bulkhead at body station 540 is the joint at which this section is attached to section 43. Above the floor, section 46 encloses the aft half of the passenger cabin, including emergency exit hatches, the aft entry door, and the aft galley door. Below the floor it includes the cavity for the center wing box, the main landing gear wheel well and the aft cargo compartment, whose door is on the lower right side of the fuselage.
(4)
Section 48 is not pressurized and extends aft from the rear pressure bulkhead at body station 1016. On top of section 48, at stations 1016 and 1088, the vertical fin attaches to four fittings, two front and two rear. A tail cone extends aft from station 1156. A compartment with fireproof walls in the lower part of the section, below the horizontal stabilizer, allows installation of the APU. (See figure 2.) The right rear torque box is sealed and sound-proofed to act as the APU air inlet duct. The horizontal stabilizer center section truss has its hinge joints by means of fittings attached to the bulkhead at station 1156. The front part of the center section truss protrudes through a cutout in the bulkhead at station 1088 and is moved up and down by a jackscrew unit fastened to the forward side of the station 1088 bulkhead. The left and right outboard sections of the horizontal stabilizer are cantilevered from the center section truss by means of fittings at the front and rear spars. An access and blowout door 3701 is located on the left side. Refer to Chapter 52, Doors, for maintenance practices regarding this door.
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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 monocoque.
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 extensions 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 openings is primary. Basic structure associated with the wheel wells is primary.
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