Which action should be taken by helicopters with receiver-only communications during sunset to sunrise?

The recommended action for helicopters with receiver-only communications during sunset to sunrise is to turn toward the controlling facility and flash the landing light. This method serves multiple purposes: it helps to make the helicopter more visible to both air traffic control and other aircraft in the vicinity, enhancing overall safety during low visibility conditions. By directing the aircraft toward the facility, it ensures that the pilot is clearly indicating their location and intent to communicate with air traffic control, which is especially important when standard communication methods are not available.

Flashing the landing light is an effective way of signaling and can be more easily recognized by other aircraft, contributing to increased situational awareness in busy airspace. This action aids in avoiding potential conflicts with other aircraft and assists controllers in directing traffic appropriately.

Turning toward the facility shows a proactive approach to communication and safety rather than relying on passive signals which may not be perceived as effectively. Other choices might involve signaling that, while visible, may not convey the necessary information to air traffic control or other pilots in the same way.