Which of the following is true regarding the Mass of the aircraft in relation to the Maximum Structural Takeoff Mass (MSTOM)?

The statement that the mass of the aircraft must always be less than or equal to the Maximum Structural Takeoff Mass (MSTOM) at takeoff is accurate because MSTOM defines the maximum weight the aircraft is designed to safely depart from the runway without compromising structural integrity or performance. Adhering to this limit is crucial for ensuring that the aircraft can achieve the necessary performance for takeoff, including adequate thrust-to-weight ratio, lift generation, and control authority.

Exceeding the MSTOM at takeoff could lead to various issues, such as insufficient lift or increased runway distance required for takeoff, which can significantly impair safety. Each aircraft has a specific MSTOM that is determined based on numerous factors, including structural limits, aerodynamic performance, and regulatory standards.

Understanding the importance of MSTOM is vital for pilots and operators, as it fundamentally impacts safety margins and compliance with aviation regulations. Proper weight management, including fuel, cargo, and passenger load, is essential in achieving safe flight operations.