13-91 Figure 13-156.  When assembling a tube into a tire, the heavy  balance mark on the tube is aligned with the light balance mark  on the tire Figure 13-155.  Tire talc is used on the inside of tube-type tires and  the outside of aircraft tubes. This prevents binding and allows the  tube to expand without stress into place within the tire. Figure 13-154.  Modern tire inflation cages have been tested to withstand catastrophic failure of a tire and wheel assembly during inflation.  All newly mounted tires should be inflated in such a cage.  proper balance, align the heavy part of the tube with the red  mark on the tire (the light spot on the tire).  [Figure 13-156] Once wheel balance is marked and the tube balance mark  and the tire balance mark are all positioned correctly, install  the outboard wheel half so the valve stem of the tube passes  through the valve stem opening.  [Figure 13-157]  Mate the  inboard wheel half to it, being careful not to pinch the tube  between the wheel rims. Install the tie bolts, tighten, and  torque as specified. Inflate the assembly in a tire inflation cage. The inflation procedure for a tube-type tire differs slightly  from that of a tubeless tire. The assembly is slowly brought  is commonly used when installing tube-type tires to ensure  easy mounting and free movement between the tube and tire  as they inflate.  [Figure 13-155]  The technician should lightly  talc the inside of the tire and the outside of the tube. Some  tubes come from the factory with a light talc coating over  the outside of the tube. Inflate the tube so that it just takes  shape with minimal pressure. Install the tube inside the tire.  Tubes are typically produced with a mark at the heavy spot  of the tube. In the absence of this balance mark, it is assumed  that the valve is located at the heaviest part of the tube. For 