How does the flight path director provide pitch and roll guidance in the TRK-FPA mode?

In TRK-FPA mode, the flight path director provides pitch and roll guidance through a single guidance bar that represents both pitch and roll inputs for the pilot. This system allows for a more integrated approach to managing the aircraft's flight path by simplifying the visual cues presented in the cockpit.

When in this mode, the guidance bar assists the pilot in tracking the desired flight path angle (FPA) while also maintaining the chosen track (TRK). The single guidance bar effectively communicates the necessary adjustments the pilot needs to make, streamlining the control process during flight. This integrated system is designed for ease of use, allowing pilots to better focus on other critical aspects of flying the aircraft.

In contrast, other options, while they may mention multiple guidance methods or suggest a lack of availability of certain systems, do not accurately reflect how the TRK-FPA mode operates in terms of guidance efficiency and ergonomic design.