What critical aspect does the ground-controlled approach (GCA) take into consideration?

The ground-controlled approach (GCA) primarily focuses on weather conditions as a critical aspect. The GCA system is designed to provide guidance to pilots, particularly during poor visibility scenarios often caused by weather. This approach utilizes radar technology to track aircraft and provides real-time instructions to pilots, enabling them to land safely even when they cannot rely on visual cues due to fog, rain, or other adverse weather phenomena.

Weather conditions are crucial since they directly impact visibility and the ability of pilots to land safely. Therefore, understanding and responding to these conditions is vital for the effective operation of the GCA system, making it essential for ensuring safe aircraft landings under varying environmental challenges.