What is the function of sequenced flashers?

The function of sequenced flashers is primarily to assist pilots in aligning with the runway centerline. These flashers provide visual cues to pilots during the approach for landing, enhancing their ability to gauge their alignment with the runway. The sequenced nature of the flashers indicates the correct path and helps ensure that the aircraft maintains a proper approach angle as it nears the runway. By lighting up in a specific sequence, they create a clear visual reference, which is especially valuable in low visibility conditions or at night.

The effectiveness of sequenced flashers in guiding aircraft to the centerline is crucial for maintaining safety and precision during landings. Other options, such as indicating the end of the runway or marking the threshold for landing, focus on different aspects of runway markings and lighting, and do not provide the alignment assistance that sequenced flashers specifically offer. Signaling turbulence also falls outside the function of these lighting systems, as they are exclusively for guiding aircraft on approach, rather than indicating atmospheric conditions.