When securing cargo, which element is critical for safety?

Using the proper restraining devices is critical for safety when securing cargo because these devices are specifically designed to handle the forces that may be exerted on the cargo during transport. Proper restraint prevents shifting, tipping, or falling of the cargo, which can lead to accidents, injuries, and damage to both the cargo and the aircraft. Restraining devices like straps, nets, and tie-downs ensure that the cargo remains stable and secure throughout the flight, addressing concerns related to load distribution and weight management.

In contrast, while visual inspection is important for assessing the condition of the cargo, it does not contribute directly to its safety during transport. Documenting cargo weight is vital for calculating load limits and ensuring compliance with aircraft specifications, but it does not physically secure the cargo. Assessing the distance to travel may play a role in planning, but it does not directly relate to the physical security of the load in the aircraft. Thus, the proper use of restraining devices is the most direct method to ensure the safety of cargo during air freight operations.