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Trailing Edge Repair

The rearmost part of an airfoil is the trailing edge. It is usually a metal strip that forms or shapes the edge by tying the ends of a rib section together and joining the upper and lower skins. Though not structural members, trailing edges are highly stressed and from time to time require repair. The paragraphs that follow discuss kinds of damage and damage inspection and location.

Trailing Edge Damage. A trailing edge's damage may be limited to one point or extended over the length between two or more rib sections. In addition to damage from collision or careless handling, trailing edges are particularly subject to corrosion from collected or trapped moisture.

Damage Inspection. Thoroughly inspect the damaged area before starting repairs; and determine the extent of damage, the type of repair needed, and the way the repair should be made. When repairing trailing edges, the repaired area must have the same contour and be the same material with the same composition and temper as the original section.

Repairs Between Ribs. Damage occurring in the trailing edge section between the ribs can be repaired as shown in Figure 2-17. Cut out the damage area and make a filler of either fiber or cast aluminum alloy to fit snugly inside the trailing edge. Then make an insert piece of the same material as the damaged section, and shape it to match the trailing edge. Assemble the pieces as shown and rivet them into place. Use countersunk rivets, and form countersunk shop heads to get a smoother contour.

Figure 2-17. Trailing Edge Repair Between Ribs.

Repair Near a Rib. To repair damage occurring at or near a rib, first remove sufficient trailing edge material to allow a complete splice to fall between the ribs. This usually requires two splices joined by an insert piece of similar trailing edge material or of formed sheet stock. The repair is similar to that for damage between ribs. Figure 2-18 illustrates a trailing edge repair at a rib.

Figure 2-18. Training Edge Repair Near a Rib

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