S 216-007
(2)
Do the steps that follow to examine the wheel well:
(a)
Examine the torque box lower skin forward of STA 400. 1) Look for corrosion near the bulkhead. 2) For airplanes with SB 51-2052, make sure the external drain
is clean.
(b)
Examine the side and top of the wheel well for the nose landing gear: 1) Look for cracks and corrosion, specially close to the
rivets. 2) Look for loose rivets, specially on the top. 3) Look for cracks, corrosion, or distortion in the
stiffeners.
(c)
Examine the trunnion fittings for distortion, cracks, corrosion, loose bolts and rivets, and the removal of paint.
(d)
Examine the support fittings for the door actuators for cracks, corrosion, and loose fasteners.
(e)
Examine the support fitting for the nose gear actuator for cracks, corrosion, and loose fasteners.
S 096-011
WARNING: YOU MUST CAREFULLY DO THE STEPS IN THE TASK BELOW TO REMOVE THE
_______ DOOR LOCKS ON THE LANDING GEAR DOORS. THE DOORS CAN CLOSE QUICKLY IF YOU DO NOT REMOVE THE DOOR LOCKS CORRECTLY. THIS CAN CAUSE INJURY TO PERSONS OR DAMAGE TO EQUIPMENT.
(3) Remove the door locks for the nose landing gear.
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53-15-01
ALL ú ú 01 Page 603 ú Jun 18/99
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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A
747-400 MAINTENANCE MANUAL
AUXILIARY STRUCTURE - DESCRIPTION AND OPERATION
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General
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A. The fuselage auxiliary structure comprises structure which does not carry primary loads. The major auxiliary structural components are described in the following paragraphs.
Upper Deck Floors
_________________
A. The upper deck floor consists primarily of nomex honeycomb core sandwich panels with graphite facing sheets supported by floor beams and seat tracks.
Main Deck Floors
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A. The main compartment floor consists of high density nomex honeycomb core panels with graphite facing sheets in areas of high usage, such as walkways, and lower density nomex honeycomb core panels with facing sheets in lesser stressed areas and nomex honeycomb core panels with fiberglass facing sheets in wet areas such as under galleys, lavatories and in entryways. The floor panels in the galley areas have fasteners installed from under the floor. These panels are supported by the seat tracks in the longitudinal direction and by the floor beams in the transverse direction.
B. The main compartment floor consists of high density nomex honeycomb core panels with graphite facing sheets in areas of high usage, and lower density nomex honeycomb core panels with facing sheets in lesser stressed areas and nomex honeycomb core panels with fiberglass facing sheets in wet areas such as entryways. These panels are supported by the seat tracks in the longitudinal direction and by the floor beams in the transverse direction.
C. A readily removable main deck floor panel provides an inflight entry to the forward electronics bay. The panel is approximately 20 by 22 inches and is located at Body Station 420 and is centered on LBL 33.0. It is mechanically latched and may be removed from the cabin or from the electronics bay below. A flame-resistant silicone rubber seal encompasses the edges of the panel and overlaps onto the adjoining panels.
Lower Lobe Floors
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A. The forward and aft cargo compartment floors consist of walkways on each side plus crosswalks in each compartment. The walkways are composed of stiffened aluminum panels with an epoxy walkway coating on the upper surface. Crosswalks are part of the lateral beams. The crosswalks are also finished with the epoxy walkway coating.
B. The bulk cargo compartment floor consists of aluminum panels (sheet) supported by Z-section and hat-section channels fastened to the fuselage frames.
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