The outer wing is the principal structural area of each wing. It is the area of the wing found between the rear and the front spars.

The outer wing is attached to the center wing box and has attachment fittings at the chords of the root ribs. The outer wing structure is the main frame of the wing. It holds the auxiliary structure and the attachment fittings for the flight control surfaces and actuators.

Access holes and covers are installed on the top and the bottom of the wings. They give access for inspection, maintenance, and repair of components installed in the wings.

The front spar of each wing has three sections. Each section is made from aluminum alloy and has stiffeners. It has a splice at WS275.60 and WS549.55 in each wing to form a one-piece assembly. This assembly extends from the wing root at BL47.61 to the winglet attachment.

The rear spar of each wing has three sections. Each section is made from aluminum alloy and has stiffeners. It has a splice at WS178.00 and WS287.00 in each wing to form a one-piece assembly. This assembly extends from the wing root at BL47.61 to the winglet attachment. 

The auxiliary spar of each wing has two sections. Each section is made from aluminum alloy. It is found aft of the rear spar of each wing between WS47.61 and WS178.00. The auxiliary spar has splices to form a one-piece assembly. The auxiliary spar is attached to the rear par and MLG trunnion attachment fittings.

The auxiliary spar and the related structure give the attachment point for the MLG trunnion attachment fittings and the hinges for the ground spoilers. 

The interspar ribs are installed between the front and rear spars. These ribs are made from aluminum alloy. They have flange caps and vertical stiffeners. They keep the contour to the wing skin panels and are the baffles in the wing fuel tanks. Some ribs are installed along the streamline in the inner section of the wing, from the wing root to the outboard brake at WS287.00.

The root rib and the ribs at WS178.00 and WS287.00 in each outer wing are sealed to divide the fuel tanks into three compartments.

The upper skin panel of each wing is made from two sections along the spar and one tip section. Each skin panel has a splice at one attachment stringer along the streamline and one strap along the chord.

The lower skin panel of each wing is made from three sections along the spar and one tip section. The tip section has a cutout for the access panel between CWS537.40 and CWS561.70. This panel gives access to the aileron control mechanism.

The upper and lower skin panels are made from aluminum alloy plate. The structure is built from extruded and machined stringers.

Access panels installed on the skin of the top and bottom of the wing, give access to the components that follow:

• The fuel system
• The flux valve
• Power control units

These access panels are made from laminated glass fabric and laminated graphite fabric.

The MLG fittings are made from hand-forged trunnion attachments of aluminum alloy. They are found between the rear spar and the auxiliary spar at WS85.00.

The two sided brace fittings for the MLG are installed on the rear spar bulkhead of the center wing box. They are made from forged aluminum alloy.

A jack fitting is installed on the rear spar in each wing at WS166.13. The jack fitting has an aluminum fitting with a helicoil insert. A flush-fit plug is turned into the insert for the protection. The plug is removed to install the jack pad.

The wing has a splice on each side of the center wing box in the wing-to-fuselage fairing contour. The wing skin joint uses a double butt splice strap for the lower skins and a single butt splice strap for the upper skins. This joint is held by a fully machined "I" section root rib at BL47.655.

The upper stringers are attached by tension fittings. The lower stringers are attached by splice fittings. The splice fittings are attached to each side of the root rib on the inner chord. They are also attached with a double-shear fork-end connection to the free leg of the stringer end.