The inverted Y consists of how many lights, and what are they called?

The inverted Y is a visual signal system used in aviation to help pilots with navigational cues during descent or approach to landing. It consists of four distinct lights: the base light, which indicates the current position relative to the landing area; the directional light, which guides the pilot along the correct path; and the left and right stem lights, which provide visual references for lateral alignment during approach.

Understanding the specific functions of each of these lights is crucial for pilots, as correct interpretation of these signals can significantly affect the safety and accuracy of landing maneuvers. The base light acts as a foundation point, while the directional light directs the approach, ensuring that pilots can align properly with their intended flight path. The left and right stem lights further assist in maintaining that trajectory by illuminating the sides of the approach, allowing for precise corrections if necessary.

This combination of four lights provides comprehensive signals that are essential for navigating safely, especially in challenging conditions. Other options present different configurations of lights, but they do not accurately reflect the standardized structure of the inverted Y system used in flight operations.