What light signal should a helicopter use while hovering towards the controlling facility?

The use of a landing light or rocking back and forth while hovering is a practical way for a helicopter to communicate its presence and intent to air traffic control or the controlling facility. Flashing the landing light, which is typically brighter and more noticeable during the day or low visibility, helps to signal to controllers that the helicopter is making an approach or is ready to land. This technique improves situational awareness for both the pilot and the ATC, effectively reducing the chance of miscommunication.

Rocking the helicopter back and forth also acts as a visual signal, indicating to controllers that the helicopter is not just transiting through the airspace but is instead preparing to land or requires attention. This combination of actions ensures that the helicopter is visible and its intentions clear, enhancing safety while operating in busy airspace.

Other options, like turning off the lights or using steady signals, do not provide the same level of effective communication and could lead to misunderstanding about the helicopter's actions. Similarly, signaling with colored smoke may not be practical in many scenarios and is typically reserved for specific situations, such as search and rescue operations.