The outer wing is the wing box structure with skin panels on the top and bottom. The box structure is a rigid assembly that consists of a front spar, rear spar and rib assemblies. The outer wing box structure has a mounting trunnion for the main landing gear, and attachment fittings for the flight control surfaces and actuators. The outer wing is sealed between the front and rear spar, and the rib between WS35.60 and WS331.35, to make the integral fuel tank.

The outer front spar assembly extends between WS35.60 and WS362.70 in each wing. It has a splice on the center front spar to make a one piece assembly that The outer wing is the wing box structure with skin panels on the top and bottom. The box structure is a rigid assembly that consists of a front spar, rear spar and rib assemblies. The outer wing box structure has a mounting trunnion for the main landing gear and attachment fittings for the flight control surfaces and actuators. The outer wing is sealed between the front and rear spar and the rib between WS35.60 and WS331.35 to make the integral fuel tank.extends between left and right rib assemblies at WS362.70. The outer front spar is a part that has a channel shape. It is made from machined aluminum alloy with the stiffeners and the caps.

The outer rear spar assembly extends between WS35.60 and WS356.47 in each wing. It has a splice on the center rear spar to make a one piece assembly that extends between left and right rib assemblies at WS356.47. The outer rear spar is a part that has a channel shape. It is made from machined aluminum alloy with the stiffeners and the caps.

The outer rear spar holds the attachment fittings for the items that follow:

• Flight Control Surfaces
• Power Control Units
• Main Landing Gear Trunnion Fittings

The auxiliary rear spar assembly is found aft of the rear spar of each wing between WS35.60 and WS70.00. The auxiliary rear spar assembly is made from machined aluminum alloy in two areas and it has a splice to make a one piece assembly. It is attached to the outer rear spar assembly with the batt ribs and the MLG mounting trunnion. The auxiliary rear spar assembly and the related structures hold the MLG mounting trunnion.

The shear web-type ribs are installed between the front and rear spars. They give the contour to the wing skin panels and are baffles in the wing fuel tanks. Sixteen of the ribs are of standard construction and are made from webs that are made stronger by the vertical members. They are attached to contoured cap angles. Eighteen of the ribs are made from machined aluminum alloy and have the stiffeners and the caps.

Sixteen standard ribs are found at WS135.39, WS176.09, WS216.78, WS237.12, WS277.81, WS298.16, WS318.50, and WS331.35 in each wing. Eighteen machined ribs are found at WS52.75, WS67.00, WS80.28, WS94.70, WS115.05, WS155.74, WS196.43, WS257.47, and WS356.47 in each wing. The rib that is found at WS196.43, in each wing, is the baffle rib.

The outboard fuel tank extends to the sealed rib at WS318.50 in each wing. The surge tank is found between ribs WS318.50 and WS331.35.

The skin panels are made from machined aluminum alloy plate and are strengthened with machined stringers. They are found from BL0.00 to WS362.70 at the top skin panels and from BL0.00 to WS342.70 at the bottom skin panels. The skin panels on the top and bottom wing surface have access panels for the servicing of the fuel system, the flux valves and the power control units.

The MLG trunnion fitting is installed between the rear spar and the auxiliary spar at WS67.00 in each wing. They are hand-forged mounting trunnions made from aluminum alloy.

The jacking fitting is installed on the rear spar at WS162.14 in each wing. The jacking fitting is made from a machined aluminum fitting with the helicoil insert. A flush-fitting nylon plug is installed in the insert for protection. The nylon plug is removed to install the jacking pad adapter.

The aileron-control access panel is made from aluminum alloy sheet. It is found from WS331.35 to WS362.70 at the bottom of the skin panels. The aileron-control access panel gives access to the wing structure and the pulley for the aileron control system.

Brush seals are installed between the aileron and the inboard and outboard edges of the wing structure. The brush seal is used to reduce the gap between the ailerons and surrounding structure with aileron in neutral position. A flexible lubricated brush is used to make sure that the aileron moves freely.

Note:
The brush seal can or cannot touch the aileron.