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System Description
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WHITE MESSAGE Require immediate crew attention. These messages are accompanied by flashing master warning, triple chime attenson with or without voice message or dedicated tone. Require immediate crew awareness and future crew action may be required in the form of alternate system selection or performance limitation. These message are accompanied by flashing master caution and a single chime. Indicate safe or normal system operation which require crew awareness, over and above the dark cockpit philosophy. Indicate minor failures or reduction in systems capability, which require no crew action.

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Overview

The leading edge is found forward of the front spar of each outer wing and extends from WS43.25 to the wing tip. Each leading edge is made from the leading edge panels and the leading-edge access-panels. The leading edge panels have the skin panel, the leading edge ribs, and the shrouds. The anti-icing tubes are installed in the leading edge panels.

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Leading Edges

The leading edge is made from the leading edge panels and the access panels. The leading edge is forward of the front spar of each outer wing and extends from WS43.25 to the wing tip. The leading edge is installed on the front spar of the outer wing and have some components of the anti-ice system and electrical wires.

The leading edge has the components that follow:

Leading Edge Panels

The leading edge panels are three independently removable D-shape sections which are tapered to the winglet and are made from clad aluminum-alloy sheet. Each section is made from the skin panel, the leading edge ribs, and the shrouds. The leading edge ribs make the D-shape of the leading edge and hold the anti-icing tubes. The skin panels are the contour of the D-section that are attached to the ribs and are installed at the spar caps. The skin panels give strength to the leading edge. They transmit the anti-icing air around the leading edge to overboard vents on the lower part of the skin.

Leading Edge Access Panels

There are four access panels on each leading edge. They are installed in the inner and outer sides of the each removable leading edge panels. The access panels give access to the duct coupling of the anti-icing system at the leading edge panels for the removal and installation. The access panels are made from chemically-milled aluminum-alloy sheet.

Leading Edge Vortillons

The vortillon is a type of boundary-layer control devise. There are three vortillons on the bottom side of the each leading edge. The No. 1 and No. 2 vortillons are installed on the bottom side of each middle leading edge with bolts. The No. 3 vortillon is installed on the bottom side of each outboard leading edge with bolts. The vortillons are made from machined aluminum alloy.

Leading Edge Stall Strips

The leading-edge stall strips cause mandatory air separation at some locations on the wing surfaces. They improve the stall characteristics. There are two stall strips on the bottom side of each middle leading edge. The inboard strips are triangle-shape parts which are installed with screws. The outboard stall strips are D-shape parts which are installed with solid rivets. The stall strips are made from machined aluminum alloy.

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