How can you determine if the gauges in an aerial apparatus are functioning properly?

To determine if the gauges in an aerial apparatus are functioning properly, starting the engine and checking if they move into normal operative ranges is the most effective method. When the engine is started, the gauges should respond to the changes in the engine's operation, moving into designated ranges that indicate normal function. For instance, fuel pressure, temperature, and oil pressure gauges typically display readings that confirm the system is working as expected. Observing the gauges in action not only verifies their movement but also allows for immediate assessment of the system's operational health.

Visual inspection alone does not guarantee functionality; a gauge might appear intact but still be faulty. Checking calibration settings is essential for ensuring precision over time but does not directly confirm if the gauge reacts correctly under operating conditions. While listening for alert signals is part of overall monitoring, it may not provide the comprehensive confirmation of function as directly observing the gauges during engine operation does. Thus, actively checking the gauges while the apparatus is running gives a clear and immediate indication of their proper functioning.