Overhaul refers to a set of activities including inspection, repair, parts replacement, and restoring equipment to optimal operating condition, usually performed after a defined operating period. In industries such as oil and gas, power generation, aerospace, automotive, and heavy industries, overhaul is a key component of Maintenance & Repair. Inspection plays a crucial role in improving reliability, safety, and service life of equipment. This article reviews the most important inspection methods used in industrial equipment overhaul, including visual inspection, non-destructive