What are the four lights that make up the inverted Y formation?

The inverted Y formation is a specific arrangement of lights used in aviation for signaling and navigation purposes. This formation includes a base light, which serves as the central point or anchor of the setup. The directional light is crucial as it indicates the orientation and direction to which the aircraft should focus during flight. The left and right stem lights flank the central elements, providing visual cues to assist in proper alignment and maneuvering.

This arrangement is especially important in air assault operations, as visibility and clear communication through signals can greatly enhance safety and coordination during complex maneuvers. The precise configuration of these lights helps pilots and ground personnel clearly interpret signals from one another, ensuring a smooth operation in challenging environments.

Other choices provide types of lights, but they do not correspond to the specific components of the inverted Y formation used in aviation signaling.