There have been many uncertain points about the contact area and average contact pressure of airplain tires which are necessary for the design of airport pabvements. It has been also difficult to messure practically the wheel load of large airplains. These problems were made clear in this report.
　Contact prints were made of large airplain tires on test pavements as the internal pressure and wheel load were changed variously. Mutual relations of wheel load, average contact pressure and contact area were obtained from the results of tire prints. It was found that the wheel load could be presumed from the gross contact area with practical accuracy.