What three inspections should be performed weekly on an MWS apparatus?

The correct choice emphasizes the importance of the pump and intake strainers, the pump gearbox, and the rapid dump system in maintaining the functionality and safety of a Mobile Water Supply (MWS) apparatus.

Regular inspection of the pump and intake strainers ensures that any debris or contaminants that could hinder water flow or damage the pump are prevented. This is crucial for effective operation, especially during emergency scenarios where reliable water supply is essential.

Inspecting the pump gearbox is equally vital as it is responsible for transmitting power from the engine to the pump. Any issues here can lead to pump failure, thereby compromising the entire water supply operation.

The rapid dump system is important for efficiently releasing water from the tank. Its functionality directly impacts the operational readiness and efficiency of the MWS during firefighting efforts, particularly when quick water release is needed.

The other options, while they contain components that are important for the overall operation of a water supply system, do not collectively address the critical functionality required for effective water delivery and operational readiness in the same way that the selected choice does.