During ground operations, what signal does a green flag indicate?

A green flag during ground operations indicates "Go forward." This signal is used to provide clear communication to the aircraft crew and ground personnel that it is safe to proceed. In aviation ground operations, various flags and signals serve distinct purposes to ensure safety, coordination, and efficiency. The green flag specifically signifies that conditions are favorable and that the aircraft can continue its movement without immediate concerns.

The other options do not align with the meaning of a green flag. For instance, a flag indicating caution or a stop would utilize different colors, such as yellow or red, to clearly denote the need for care or a complete halt. Similarly, preparing for takeoff is often communicated through different procedures, such as readiness checks, rather than through flag signals that pertain solely to movement on the ground. Understanding the significance of these signals is crucial for maintaining safety and effective communication during ground operations.