Which statement about the footprint is accurate?

• A. The footprint is defined by the amount and size of tires on the landing gear
• B. The footprint only depends on wing span
• C. The footprint is unrelated to weight capacity
• D. The footprint is determined by engine type

Answer: (A)

The footprint refers to the ground area an aircraft covers through its landing gear tires—the size of the contact patches where the tires meet the surface. This area is mainly determined by how many tires are on the gear and how large each tire is. More tires or larger tires increase the total contact area, making the footprint larger. Wing span and engine type don’t set this ground contact area. Weight capacity matters in how the tires and gear are sized to support the aircraft, and heavier loads change the load on each tire (which can alter the actual contact patch), but the fundamental determinant of footprint is the number and size of the tires. That’s why the statement about the footprint being defined by the amount and size of tires is the best fit.