How is traffic load calculated in aviation?

Traffic load in aviation refers to the amount of payload that an aircraft is carrying, which includes passengers, cargo, and other items. This load is crucial for ensuring the aircraft can operate safely within its performance parameters.

The correct method to calculate traffic load is to subtract the total operating mass (DOM) from the zero fuel mass (ZFM). The zero fuel mass represents the total weight of the aircraft without any usable fuel. The total operating mass is the sum of the ZFM and the fuel load for the flight. By using the formula ZFM - DOM, you determine the amount that is effectively available for cargo or passengers after accounting for the operating weight of the aircraft.

This calculation is essential because it helps in determining whether the aircraft can be loaded safely and still adhere to performance limits, including takeoff weight and landing weight.