What color indicates the engaged mode of the A/THR in Column 1 of the FMA?

The engaged mode of the A/THR (Auto-Thrust) in Column 1 of the FMA (Flight Mode Annunciator) is indicated by the color green. This specific color is used to signify that the system is actively controlling the thrust to maintain the set parameters, which is crucial for safe operation during various phases of flight.

In aviation, color coding is utilized for quick and easy recognition of different states and modes of airplane systems. Green indicates that the system is in a normal operating condition, providing pilots with reassurance that they can rely on the auto-thrust to assist with maintaining the desired flight parameters, such as airspeed.

A blue indication, although used in other contexts within the FMA, suggests that a mode is available but not currently engaged. Amber indicates caution or a warning state, specifying a potential issue, and magenta can represent lateral or vertical guidance, often related to navigation systems. Understanding these color codes is vital for pilots to quickly assess the status of their aircraft systems and respond accordingly.