13-92 Figure 13-159.  A tire balancing patch (left), adhesive wheel weights (center), and a bolted wheel weight (right) are all used to balance  aircraft tire and wheel assemblies per the manufacturer’s instructions. Figure 13-157.  Mounting a tube type tire with the tube valve stem  positioned to pass through the outboard wheel half. Figure 13-158.  A typical aircraft tire and wheel balancing stand. up . to full operating pressure. Then, it is completely deflated.  Re-inflate the tire/tube assembly a second time to the  specified operating pressure and allow it to remain with no  load for 12-hours. This allows any wrinkles in the tube to  smooth out, helps prevent the tube from being trapped under  a bead, and generally evens how the tube lays within the tire  to avoid any stretched areas and thinning of the tube. The  holding time allows air trapped between the tube and the tire  to work its way out of the assembly, typically through the  tire sidewall or around the valves stem. cones. The wheel is free to rotate. The heavy side moves to  the bottom.  [Figure 13-158]  Temporary weights are added  to eliminate the wheel from rotating and dropping the heavy  side down. Once balanced, permanent weights are installed. Many aircraft wheels have provisions for securing the  permanent weight to the wheel. Weights with adhesive  designed to be glued to the wheel rim are also in use.  Occasionally, a weight in the form of a patch glued to the  inside of the tire is required. Follow all manufacturer’s  instructions and use only the weights specified for the wheel  assembly.  [Figure 13-159] Some aviation facilities offer dynamic balancing of aircraft  tire and wheel assemblies. While this is rarely specified by  manufacturers, a well-balanced tire and wheel assembly helps  provide shimmy free operation and reduces wear on brake  and landing gear components, such as torque links.  Once an aircraft tire is mounted, inflated, and accepted for  service, it can be balanced to improve performance. Vibration  is the main result of an imbalanced tire and wheel assembly.  Nose wheels tend to create the greatest disturbance in the  cabin when imbalanced.  Static balance is all that is required for most aircraft tires and  wheels. A balance stand typically accepts the assembly on  Tire Balancing 