How is useful load defined in relation to maximum gross weight and basic empty weight?

• A. The weight of the airframe.
• B. The fuel weight used for cruise.
• C. The weight of the pilot, copilot, passengers, baggage, usable fuel, and drainable oil.
• D. The maximum allowable gross weight minus the basic empty weight.

Answer: (D)

Useful load is the amount of weight you can add to the basic empty aircraft to reach its maximum safe takeoff weight. In other words, it’s the difference between the maximum gross weight and the basic empty weight. This remaining weight capacity is what allows you to carry the crew, passengers, baggage, usable fuel, and drainable oil without exceeding the airplane’s weight limit. The airframe’s weight itself is already accounted for in the basic empty weight, while fuel for cruise is just one part of the usable load, not the definition itself.