What is a key factor in calculating the Landing Mass?

The correct choice highlights that the aircraft's structural limits play a crucial role in calculating the Landing Mass. This factor is essential because every aircraft has specific weight restrictions defined by the manufacturer to ensure safe operation. The Landing Mass must not exceed these structural limits to prevent any risk of structural failure upon landing.

Understanding the structural limits encompasses considerations such as maximum landing weight, which is determined by various factors including design, material strength, and intended operational use of the aircraft. By adhering to these limits, pilots ensure the aircraft can safely handle the forces experienced during the touchdown and subsequent roll-out phases of landing.

While elements such as the mass of passengers, prevailing weather, and fuel usage are also relevant to overall operational safety and performance, they do not directly dictate whether the aircraft is within safe landing parameters from a structural standpoint. Budgeting for passenger mass and monitoring fuel levels are important for safe flight operations, but the key point in calculating Landing Mass fundamentally revolves around the adherence to structural limits set by the aircraft's design.