What action should a pilot take if the low voltage warning light illuminates during flight?

When the low voltage warning light illuminates during flight, the appropriate action for the pilot is to check the voltage meter and return to land. This is crucial because the low voltage indication often suggests that the alternator is not charging the battery adequately, which can lead to electrical failures or other serious issues if not addressed promptly. By monitoring the voltage meter, the pilot can assess the severity of the situation—determining whether the voltage is dropping and how quickly.

If the voltage is critically low, it may necessitate an immediate return to the airport for a safe landing. This proactive measure helps ensure the safety of the flight, as further flight with a failing electrical system can result in the loss of critical avionics or electrical systems needed for safe operation.

Turning off non-essential electrical equipment can also be a viable response in some scenarios. However, the immediate focus should be on verifying the voltage level and preparing for a safe landing depending on the findings. Contacting air traffic control is a prudent step in certain scenarios but is secondary to addressing the potential loss of electrical power and ensuring an emergency landing if required.