When must a reference line extend the full length of a bottom side rail?

The assertion that a reference line must extend the full length of a bottom side rail when there is bowing over the entire bottom side rail is based on the need for accurate assessment of the container's structural integrity. Bowing, which refers to a deviation from a straight line, can compromise the effectiveness and safety of the container. By marking a reference line that covers the entire length of the bowed section, inspectors can effectively illustrate the extent of the distortion. This aids in determining the overall impact on the container's performance and ensures that any analysis or repairs take the full extent of the damage into account. A complete reference line in this case provides clarity for both inspection and maintenance records, allowing for better communication among those involved in repair or assessment processes.