Why is securing freight in ULDs crucial in aviation?

Securing freight in Unit Load Devices (ULDs) is essential in aviation primarily to prevent shifting loads, which can significantly affect the aircraft's center of gravity. When cargo is loaded onto an aircraft, maintaining a proper balance is crucial for safe flight operations. If the freight moves or shifts during the flight, it can lead to an unbalanced aircraft, which may impair handling characteristics, affect the stability of the flight, and, in some cases, lead to control issues or even an accident.

Moreover, the center of gravity is a critical parameter that pilots and flight planners must calculate accurately to ensure that the aircraft is loaded within safe limits. By securing freight in ULDs, the load is not only kept in place but also organized in a way that helps ensure the aircraft remains within its defined center of gravity limits throughout the duration of the flight. This contributes directly to the safety and efficiency of the flight operation.