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Tread Patterns
Size Designation

Aviation Structural Mechanic (H&S) 3&2 - How airplanes are built and how to maintain them
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specific circumstances or as required by military standards, such as ice and snow treads. NOTE: Additional safety precautions are required in handling ice and snow treads. • Rubber tread. A rubber tread is constructed from 100-percent new (no reclaim) rubber. It maybe new natural rubber, new synthetic material, or a blend of new material and new synthetic materials. • Cut-resistant tread. A cut-resistant tread has improved cut-resistant properties that are imparted to the tire by incorporating a barrier into the undertread that resists penetration of cutting objects. • Reinforced tread. A reinforced tread is constructed with fabric cord or other reinforcing materials as an integral part of the tread. See figure 11-11. • Reinforced cut-resistant tread. A reinforced cut-resistant tread combines the features of both the cut-resistant and reinforced-tread designs. Ply Rating Reference to the number of cord fabric plies in a tire has been superseded by the term ply rating. This term is used to identify a tire’s maximum recom- mended load for specific types of service. It does not necessarily represent the number of cord fabric plies in a tire. Most nylon cord tires have ply ratings greater than the actual number of fabric plies in the cord body. Tire Rebuilding/Retreading The rebuilding of aircraft tires has been practiced for many years.    A rebuilt tire is one that has a new Figure 11-11.—Sectional view of two aircraft tires showing different construction details. 11-12







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