F. Put the Airplane to Its Usual Condition
 S 416-009
 (1)  
Install the insulation blankets.

 (2)  
Install the ceiling panel dripshields (Ref 25-14-01/401).

 S 416-010
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A 747-400 MAINTENANCE MANUAL
 (3)  S 416-011Install the sidewall lining.
 (4)  S 416-012Install the crew escape hatch (Ref 52-21-01/401).
 (5)  S 416-013Install these panels: (a) P6 Main Power Distribution Panel (b) P7 Overhead Circuit Breaker (c) P11 First Observers Console (d) P13 Second Observers Console (e) P461 Overhead Maintenance Panel.
 (6)  S 416-014Install the observers' seats (Ref 25-11-03/401).

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A
747-400 MAINTENANCE MANUAL
 CENTER SECTION: STATION 520 TO STATION 2360 - DESCRIPTION AND OPERATION
________________________________________________________________________
 1.  General (Fig. 1)_______
 A.  The fuselage center section consists of sections 42, 44, and 46. Section 42 is that section between the nose section and the forward end of the wing box; section 44 is the section over the wing box and wheel well; and section 46 is aft of the wheel well extending to the aft pressure bulkhead. The fuselage center section provides support and houses the upper deck, the main deck, lower deck, and cargo compartments.
 B.  The main deck is on the same level as that of section 41 and continues aft to the pressure bulkhead at station 2360. The upper deck extends aft to station 1101. The lower deck consists primarily of the main gear wheel wells, the wing center section areas, and the three cargo compartments.
 C.  The forward containerized cargo compartment begins in section 41 and ends at the aft end of section 42. The aft containerized cargo compartment extends from the forward end of section 46 aft to station 1920, and the bulk cargo compartment is located in the aft end of section 46 from station 1920 to 2160. The forward containerized cargo compartment has an outward opening door 104 inches wide by 68 inches high near the forward end. The aft containerized cargo compartment has the same size door at the aft end. Access to the bulk cargo area is through the 44-inch high by 47-inch wide inward opening door toward the forward end of the compartment.
 D.  Access to the main deck is by one of two doors on the left side. Access to the upper deck is by a retractable ladder in section 41 or by a crew entry door in the right side of the upper deck.
 E.  The main landing gear wheel well, from station 1241 to 1480, houses both the body and wing main landing gear. The keel beam separates the left wheel well from the right and then extends forward beneath the center wing box. Attached to each side of the fuselage from station 1350 to 1480 outboard (Fig. 2) of the wheel well is a longeron crease beam.
 2.  Frames______
 A.  The frames are Z-section members of aluminum alloy that form the cross-sectional shape of the body and carry pressure loads. They are attached, where required, to form a shear tie to the skin. Spacing is generally 20 inches. Depth of the frames vary with typical depths of 6 inches in the main deck area, 8 inches in the upper deck area, and greater in depth in the lower lobe to provide support for the cargo floor. Attached to the frames at WL 199.8 307.5 are the floor beams which absorb the normal loads of seat tracks and floor panels plus the tension loads due to cabin pressurization.
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