This Standard provides guidelines for operating equipment walkdowns that are designed to ultimately improve the thermal performance and efficiency of the power plant. Following these guidelines may also lead to more proactive maintenance practices, which can also be expected to improve the reliability of the plant. This Standard provides guidelines for walkdowns of power plants using fossil fuels during operating periods. Some portions may be applicable to other types of power plants. This Standard contains a series of sections, each pertaining to specific equipment and/or systems commonly found in power plants. Inspections covered in this Standard are intended to take place during plant operation. Each section of this Standard can be used independently and includes recommendations on what to look for during inspections.