What is measured by zero fuel weight?

Zero fuel weight refers specifically to the weight of the aircraft without any usable fuel. This weight includes the aircraft's structure, equipment, cargo, and passengers. Knowing the zero fuel weight is crucial for safety and performance calculations, as it helps determine how much fuel can be added without exceeding the aircraft's maximum takeoff weight.

Understanding zero fuel weight is essential for flight planning, as it influences factors such as the distribution of weight and balance, structural limits, and flight performance. It ensures that the aircraft is loaded correctly and that sufficient fuel can be carried for the mission without exceeding regulatory weight limits.