What is indicated by a green ATC light signal when on the ground?

A green ATC light signal when on the ground indicates that the aircraft is clear for takeoff. This signal serves as a communication method between air traffic control and pilots, particularly in situations where voice communication may not be feasible, such as when aircraft are in close proximity on the ground.

When a pilot receives a green light signal, it is an important confirmation that they can safely proceed with the takeoff process, meaning no additional instructions or restrictions are currently in place. This enhances safety by ensuring that the pilot has been given explicit clearance to become airborne.

In contrast to other signals, a green light specifically relates to the clearance for takeoff, while other colors or signals have their unique meanings and are pertinent to different phases of flight or ground operations. For example, a red signal would indicate a need to stop, highlighting the importance of understanding each signal’s specific implication.