Tire balance marks

I would like more information on the heavy spot and light spot marking on the aircraft tire. How does the heavy spot of a tire helps to maintain the balance of a tire?


Thanks for your question.  The answer can be found in Advisory Circular 43.13-1B paragraphs 9-8 and 9-18.  The heavy spot of the tube is marked with a yellow line; if it is not marked, use the valve stem as the heavy mark.  Align the yellow line of the tube with heavy spot marked on the tire (usually a red mark) when installing the tire.  When the tire is not balanced, the heavy spot of the tire will always hit the ground first. The repeated of impact at one location on the tire will cause excessive wear at one spot and can lead to  vibration problems and premature wear. 

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