Typical Rear Spar Joint
Figure 001
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Typical Rear Spar Joint
R Figure 001A
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R Typical Rib Figure 002
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R Typical Rib with Flap Track Attachment Figure 003
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R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
(Ref. Fig. 004)
**ON A/C 301-399,
(Ref. Fig. 004A)
**ON A/C ALL
D. Skin Panels and Stringers
The top and the bottom surfaces of the wing box are made of skin panels
machined from aluminum alloy. There are two panels on the top skin and
three panels on the bottom skin. To increase their strength, the panels
have stringers machined from aluminum alloy extrusions. Joint straps,
made of aluminum alloy, connect the panels. Interference bolts attach the
panels to the ribs and the spars.
The top and the bottom skin panels continue a short distance forward of
the front spar. The leading edge structure attaches to these projections.
Outboard of the MLG support rib, the skin panels continue a short
distance aft of the rear spar. The trailing edge structure and the
trailing edge devices attach to these projections.
There are 21 access panels, in the bottom skin panels, which give access
into the wing box. The bottom skin panels are reinforced in the area
around the holes for the fuel pumps (Ref. 28-21-00).
There is one opening in the top skin between RIB22 and RIB23, for the
overwing refuel adaptor.
Reinforcing plates are attached to the outer face of the bottom skin
panels, and to the inner face of the top skin panels to add strength at
the pylon attachments.
A reinforcing plate, machined from aluminum alloy, is attached to the
outer surface of the wing-box bottom skin. This adds strength to the skin
panels at the MLG attachments.
(Ref. Fig. 005)
Top and Bottom Skin Panels
Figure 004
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Top and bottom skin panel, showing vent duct location and construction
R Figure 004A
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Wing Root Figure 005
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E. Wing Root Joint
The wing box of the outer wing is attached to the wing box of the center wing at RIB1. Top and bottom fittings of aluminum alloy connect the spar webs of the center wing to those of the outer wing. A cruciform member is used to keep the continuity of the top skin across the joint. Bolts attach the top skin panels of the center wing and the outer wing to the cruciform member.
Crown fittings made of aluminum alloy keep the continuity of the top skin stringers across the joint. The crown fittings are attached to the outboard vertical face of the cruciform member (RIB1). Bolts attach the stringers to the crown fittings.
The continuity of the bottom skin across the joint is kept through a triform member. There is a strap machined from aluminum alloy across the joint. Interference bolts attach the strap and the bottom skin panels to the triform member. The bottom skin stringers are not continuous across the joint. End loads are absorbed by the stringer-to-skin joint.
F. Dry Bays
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
(Ref. Fig. 006)
**ON A/C 301-399,
(Ref. Fig. 006A)
**ON A/C ALL
On each wing there is a dry bay which is inboard of the engine, and immediately behind the front spar.
Machined aluminum alloy posts, located against the ribs, are the vertical attachments for the closing panel. There is a top plate land, attached to a stringer from the fuel tank area, and a sealing angle on the bottom. Brackets reinforce both areas.
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