What operation is optional during a semi-monthly inspection?

During a semi-monthly inspection, the operation of starting the engine is considered optional because the primary focus of these inspections is to evaluate and maintain various critical systems without necessarily needing to run the engine. Starting the engine can be useful for thorough checks or to ensure that everything is functioning properly, but it is not always required to assess the status of the equipment or perform routine maintenance tasks that can be done without engine operation, such as checking fluid levels or inspecting filters.

In contrast, activities like changing the fuel filter, checking the oil level, and inspecting the radiator are essential parts of the maintenance process and help ensure the engine operates efficiently and reliably. These tasks typically need to be done consistently to prevent potential issues that could affect performance and safety.