What term describes the distance from the Reference Datum Line to the center of gravity of cargo?

The term that describes the distance from the Reference Datum Line to the center of gravity of cargo is referred to as the Cargo Arm. This measurement is crucial in aircraft balance calculations since it helps determine the aircraft's center of gravity when cargo is loaded. Understanding the Cargo Arm allows aircrew members to ensure that the aircraft remains within its weight and balance limits, which is essential for safe operation.

The Cargo Arm directly influences the moment created by the weight of the cargo, as the moment is calculated by multiplying the weight of the cargo by the Cargo Arm. Thus, knowing the Cargo Arm is fundamental for maintaining balance and ensuring that the load does not exceed the aircraft's capabilities.