What does a flashing green light signal indicate to an aircraft returning to land?

A flashing green light signal indicates "Return for landing." This signal is primarily used in aviation to safely direct aircraft back to the runway. When a pilot sees this flashing green light, it serves as a clear instruction to proceed to land, confirming that the pilot should make their approach.

In aviation protocols, different light signals communicate specific messages to pilots, and the flashing green light emphasizes the urgency for the aircraft to return to base or land. This signal is critical during situations where aircraft may have had to temporarily divert or enter a holding pattern and now need clear guidance to safely land.

Understanding the various signal meanings, including the situations under which they are used, ensures that pilots can respond accordingly and maintain safety during their landing processes.