When must repairs be conducted based on envelope damage criteria?

Repairs must be conducted based on envelope damage criteria primarily when a component is permanently deflected beyond reference planes. This criterion is significant because such deformation can compromise the structural integrity and functionality of the container. Permanent deflection affects how the container fits within operational systems, its stackability, and overall strength during transport. Ensuring that all critical components maintain their specified shapes and configurations is essential for maintaining safety and compliance with industry standards.

While discoloration, visible dents, and rust may indicate cosmetic or potential integrity issues, they do not always necessitate immediate repairs according to the envelope damage criteria. For instance, a dent might not impact the container's performance or safety if it is within acceptable limits defined by inspection guidelines. Similarly, discoloration can result from various factors that do not affect the structural performance, and rust requires a defined extent before repairs are mandated. Thus, criterion B is the most definitive for triggering repairs due to its emphasis on structural integrity.