What is the appropriate action when visible moisture is present?

When visible moisture is present, it's critical to ensure that the aircraft's systems are prepared to prevent icing conditions from affecting performance and safety. Turning on the ignition switches is relevant in this context because it helps to ensure that the engine remains operational and ready to handle conditions that may lead to engine icing or performance issues.

In the presence of visible moisture, especially at temperatures near or below freezing, there's a risk of ice accumulating on critical components. Activating the ignition systems can help manage this risk by maintaining engine responsiveness and promoting effective fuel combustion, which is essential for avoiding potential engine failures.

Maintaining the proper function of the ignition system is a necessary precaution when flying in conditions that include visible moisture, as it helps to mitigate the challenging environmental factors that can arise during flight.