How is Useful Load defined?

Useful Load is defined as the difference between the gross takeoff weight and the basic empty weight of the aircraft. This concept is crucial for understanding an aircraft's weight limitations and operational capabilities. The gross takeoff weight includes everything the aircraft is carrying at the moment of takeoff, such as passengers, cargo, and fuel. On the other hand, the basic empty weight refers to the aircraft's weight without any useful load but including all equipment and systems necessary for operation, such as the airframe, engines, and essential systems.

By calculating the Useful Load in this manner, pilots and operators can determine how much load (passengers, cargo, etc.) can be added to the aircraft without exceeding safety limits. This definition is vital for ensuring regulatory compliance and safe flight operations, making it an essential aspect of mass and balance considerations in aviation.