Which of the following is NOT included in a periodic test?

The correct answer highlights that checking the foam solution is not typically included in a periodic test. Periodic tests are often focused on the operational readiness and mechanical integrity of the vehicle and its systems, ensuring everything functions as intended during an emergency response.

Flushing pump tanks, for example, is essential to remove any contaminants or debris that may hinder pump operation, thus maintaining effective performance. Checking cooling system hoses is also crucial, as any deterioration could lead to overheating and engine failure, which are critical in maintaining operational readiness. Similarly, power saws must be checked for functionality and safety, as they are vital tools during emergency situations.

On the other hand, while foam solution quality is important, it is often part of a broader functional check or maintenance routine rather than a periodic test focused on immediate operational components. Therefore, it is understandable that checking foam solution would be excluded from what constitutes a typical periodic test scenario.