1. Figure 1. - The different parts of landing gear structure

2. Figure 2. - Model of landing gear structure Figure 3 - The variation diagram of actuator displacement

3. Figure 4 - The variation diagram of actuator velocity Figure 5 - The variation diagram of actuator acceleration

4. Figure 6 – Main landing gear virtual model, retractable to internal, with dual tandem wheels configuration, mounted on proper testing equipment, position: retraction (down) Figure 7 – Main landing gear virtual model, retractable to internal, with dual tandem wheels configuration, mounted on proper testing equipment, position: 23° orientation

5. Figure 8 - Main landing gear virtual model, retractable to internal, with dual tandem wheels configuration, mounted on proper testing equipment, position: 70 ° orientation (up) Figure 9 - Main landing gear kinematical virtual model, retractable to internal, with dual tandem wheels configuration, mounted on proper testing equipment, position: deployed (down)

6. Figure 10 – Main landing gear kinematical virtual model, retractable to internal, with dual tandem wheels configuration, mounted on proper testing equipment, position: retraction (up) Figure 11 – The displacement variation of main landing gear virtual model, retractable to internal, with dual tandem wheels configuration, mounted on proper testing equipment, position: retraction (up)

7. Figure 12 – The displacement variation of main landing gear virtual model, retractable to internal, with dual tandem wheels configuration, mounted on proper testing equipment, position: intermediate Figure 13 – The testing equipment and landing gear real prototype (proper design and manufacturing)