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New tire identification markings
TIRE STORAGE

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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is used to evaluate the depth of cuts in the thread area. Tires are marked with a red dot (14) on the sidewall to indicate the lightweight (balance) point of the tire. Rebuilt Tires Identification Markings In the tire rebuilding process, additional markings are engraved or embossed on the sidewall. See figure 11-14. First, R or TR followed by a number identifies the number of times the tire has been rebuilt. Next, the Julian date of the tire’s rebuilding is added. Finally, the name of the rebuilder and plant location is added. Vent Markings Tube tires with inflation pressures greater than 100 psi and all tubeless tires must be suitably vented to relieve trapped air. Tube tires are vented in one of two ways. The first method uses air bleed ridges on the inside tire surface and grooves on the bead faces. The ridges and grooves channel the air trapped between the inner tube and the tire to the outside. The Figure 11-14.—Rebuilt tire identification markings. 11-15







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