What does a steady green light mean while on the ground?

A steady green light while on the ground indicates that the aircraft is cleared for takeoff. This signal is part of the established visual communication system between pilots and air traffic control, designed to ensure the safe movement of aircraft on and around the runway. The steady green light specifically signals that all conditions are satisfactory for the aircraft to commence its takeoff.

Understanding this signal is crucial for flight operations, as it ensures that pilots are aware of their clearance and can proceed with confidence. Each color and signal in the lighting system serves a unique purpose, and the clarity of the messages illustrated by these lights is essential for maintaining safety and efficiency in busy airspaces.

The other options represent different phases of flight or alerts, but they do not correspond to the meaning of a steady green light on the ground. For instance, a request to taxi to the active runway would typically involve a different signal, and likewise for other situations concerning airport safety or landing procedures.