What degrees do the green and red navigation lights show through from dead ahead?

The green and red navigation lights on an aircraft are strategically positioned to provide essential information about its orientation and direction when viewed from other aircraft, particularly at night or in low visibility conditions. The green light is mounted on the right (starboard) wing and is visible from 110 degrees from dead ahead, while the red light is mounted on the left (port) wing and is also visible within a similar 110-degree arc.

When observing the aircraft from the front (dead ahead), both lights should collectively provide a visibility range of 110 degrees to either side of the centerline of the aircraft, thereby totaling a 220-degree area of visibility. This means that the lights signify an awareness of the aircraft’s orientation in relation to others, allowing pilots to determine its direction of travel based on which light is visible in the visual field.

The choice indicating 110 degrees accurately reflects the combined span of visibility for these essential navigation aids from an oncoming perspective, ensuring that the pilot and controllers can assess an aircraft’s orientation effectively in the surrounding airspace.