How can a pilot illuminate pilot-controlled lighting?

To illuminate pilot-controlled lighting, the appropriate method is to key the microphone on the designated frequency. This is a common practice in aviation where the pilot transmits a short communication (usually a few key presses) on the radio frequency associated with the lighting system. When the pilot does this, it activates the lights, allowing for enhanced visibility during takeoff or landing, especially at airports that do not have permanent lighting systems.

The other methods described do not effectively activate such lighting. For instance, switching on the landing lights does not control the specific lighting systems referred to as pilot-controlled lights. Similarly, using a handheld flashlight does not accomplish the task of illuminating runway or taxiway lights, as these systems are specifically designed to respond to radio signals. Lastly, making a verbal request to Air Traffic Control (ATC) would not directly trigger the lighting systems; instead, it may only serve to inform ATC of the pilot’s need without having the intended effect of illuminating the controlled lights. Therefore, keying the mic on the appropriate frequency is the correct and effective method for a pilot to illuminate pilot-controlled lighting.