Details of the Top Skin Stringers - RIB1 thru RIB8 R Figure 638/TASK 57-20-00-991-035
 1EFF : 301-399, 1 57-20-00Page A688 1 1 Aug 01/05 1 1 1CES 1

 MAIN STRUCTURE - DESCRIPTION AND OPERATION
__________________________________________
 1.
 General

_______ The main structure of the outer wing is the wing box, which tapers from wing root (RIB1) to wing tip (RIB27). It also makes the integral fuel tank and the vent surge tank (Ref. 28-00-00). Access into the wing box is through the access panels in the bottom skin.

 2.
 Component Location

__________________

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 The wing box is made of:
 -
the wing spars (front and rear)

 -
the ribs

 -
the top and bottom skin-panels

 -
the top and bottom stringers

 -
the wing-root joint.

 Attached to the wing box are:

 -
the fixed partitions (slat cans) (Ref. 57-24-00)

 -
the attachment fittings (Ref. 57-26-00)

 -
the access panels (Ref. 57-27-00)

 -
the jacking point and the drip fence (Ref. 57-29-00).

 **ON A/C 301-399,
 The wing box is made of:
 -
the wing spars (front and rear)

 -
the ribs

 -
the top and bottom skin-panels

 -
the top and bottom stringers

 -
the wing-root joint.

 Attached to the wing box are:

 -
the fixed partitions (slat cans) (Ref. 57-24-00)

 -
the attachment fittings (Ref. 57-26-00)

 -
the access panels (Ref. 57-27-00)

 -
the jacking point, the drip fence and the air dam (Ref. 57-29-00).

R **ON A/C ALL
R 3. Description___________
 A. Wing Box
 The wing box makes the integral fuel tank and the vent surge tank. Sealed inter-spar ribs separate these tanks. The primary sealing of the tanks is made through the mechanical attachment of the structure. Interfay sealants are used at the tank edges.
 Each outer wing fuel tank also has a closed area, made between RIB1 and RIB2, which is a collector cell for the main fuel pumps (Ref. 28-21-00).
 On each wing there are two dry bays, which are inboard of the engine, immediately behind the front spar. The larger of the bays is between ribs RIB5 and RIB6. A short rib, RIB6B, makes the outboard end of the smaller bay.
 There are closing panels inside the fuel tank, at the rear of the dry bays. The closing panels are made of carbon fibre with a honeycomb core. They are attached with nuts and bolts to machined aluminum alloy posts installed against the ribs. There is also a top plate land. attached to a stringer, and a bottom sealing angle. Brackets add strength to both these areas.
 Sealing blocks and seals prevent fuel leakage into the dry bays between the stringers and the top and bottom skin panels.
 Two holes in the front spar give access into the dry bays. They are closed with closing plates.
 B. Wing Spars
 The spars are machined from aluminum alloy. They give strength to the wing box. The front and the rear spars extend from RIB1 to RIB27.
 (1) Front Spar
 The front spar is made as a single piece, to include:
 -a horizontal stiffener (crack retarder)
 -vertical web stiffeners
 -a reinforced hole at each slat track position
 -reinforced holes for the components of the fuel system (Ref. 28-00-00)
R 1EFF : ALL 1 57-21-00Page 2 1 1 Aug 01/04 1 1 1CES 1

 -an opening for the build door between STA0/RIB1 and STA700/RIB2, for the installation of the outer wing to the centre box.

R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
 (Ref. Fig. 001)
 **ON A/C 301-399,
 (Ref. Fig. 001A)
 **ON A/C ALL
 (2) Rear Spar
 The rear spar is made from three parts. These are the inner, the middle and the outer sections. Joint plates connect these sections together to make a continuous structure. The joints are made at RIB6 and RIB22. The rear spar is machined to include:
 -a horizontal stiffener (crack retarder)
 -vertical web stiffeners
 -reinforced holes for the components of the fuel system (Ref. 28-00-00)
 -a reinforced jacking point at RIB9.
 (Ref. Fig. 002, 003)

 C. Ribs
 There are 27 ribs, machined from aluminum alloy, installed in the wingbox of each outer wing. Each rib is continuous between the front and rear spars. The centre-wing to outer-wing joint is made at STA0/RIB1, which closes the centre wing box. Ribs RIB22 and RIB27 make the other lateral boundaries of the fuel and vent tanks. At RIB2 thru RIB9, and at RIB12 and RIB19, the ribs have double flanges for attachment of skin panels. The remainder have single flanges.
　
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