There have been lots of uncertain points regarding how an aircraft gear load transmits to bases and/or subgrade in an airport pavement for a large aircraft. As
the properties of the materials of pavements are so complicated that they cannot be illustrated by only an elastic theory, some airport test pavements for large aircraft have been made and tested by full scale loadings-static and dynamic. The test results have made clear the state of transmission of a aircraft gear load to base and/or subgrade in the pavements with not only granular material bases but also stabilized material bases.
　As the size and weight of aircraft have become larger, many kinds of arrangement of gears and wheels have appeared. This situation has complicated the design condition of airport pavements. In the case of an aircraft like a jumbo jet (B/747), the stresses from each gear overlap considerably at a very thick point of pavement because the distance between two gears of the aircraft has become smaller than that of a conventional large airfraft. So we must consider the influence in some cases of designing airport pavements. How to rationally consider the influence in design of airport pavements has been examined on the basis of the measured str
esses and deflections in the subgrades of pavements.