Which of the following statements about preliminary checks is TRUE?

The statement regarding confirming that the wheels are properly chocked if required is true because chocking the wheels is a fundamental safety precaution that ensures the apparatus remains stationary during operations, especially when on an incline or uneven surface. This step is critical to prevent any unintended movement that could pose a significant risk to personnel, equipment, and bystanders. Proper wheel chocking is a vital part of the preliminary checks, as it lays the groundwork for safe aerial operations.

While ensuring that all gauges function correctly, checking fluid levels only, and inspecting for cosmetic damages are also important aspects of maintenance and safety, they do not encompass the critical safety measures like wheel chocking that prevent accidents during aerial operations. For instance, confirming gauge functionality is essential, but it does not directly address the immediate physical safety aspect as effectively as ensuring the wheels are chocked. Thus, the focus on chocking adds a crucial layer of safety in the preliminary preparation for using aerial fire apparatus.