How can you determine a high/low or over-voltage situation during flight?

The identification of a high or low voltage situation during flight is critical for maintaining aircraft electrical system integrity. The scenario of overcharging or undercharging is most directly indicated by the red voltage light. This warning light is a crucial component of the aircraft's electrical monitoring system. When it illuminates, it signals to the pilot that the voltage levels are outside of the acceptable range. An overcharging scenario suggests that the alternator is producing excessive voltage, which could damage electronic equipment and the battery. Conversely, if the voltage is too low, it means that the battery is not receiving enough charge, which may lead to systems failure.

While the battery gauge does provide useful information about voltage levels, it is not always immediately visible to the pilot during critical phases of flight. Additionally, relying solely on an ammeter, which may fluctuate based on engine RPM, doesn’t accurately reflect the overall health of the electrical system in terms of voltage. Lastly, altitude itself does not dictate voltage changes in a manner that can be reliably used for assessment in flight. Thus, the warning light serves as a direct and immediate indication that requires pilot attention to ensure the safety and functionality of aircraft systems.