In this paper is presented a method for constructing diagrams illustrating the strength of landing gear structures for various combinations of loads. The diagrams show graphically the maximum combinations of vertical-drag and vertical-side loads which a landing gear can sustain without failure. Strength diagrams for several different airplanes are presented and their significance is discussed. * The charts facilitate a comparison of landing gear strengths, are useful in determining the effect of physical changes to the gear structure, and are helpful in the derivation of suitable ground load strength requirements.