Which buttons would you use to change the altitude mode on the FCP?

The correct choice for changing the altitude mode on the Flight Control Panel (FCP) is the combination of V/S and SPD buttons. Utilizing the Vertical Speed (V/S) button allows the pilot to select a specific rate of ascent or descent, thereby directly impacting the altitude mode. The Speed (SPD) button can engage or adjust the airspeed, which works in conjunction with altitude settings to maintain optimal flight trajectory and performance.

This combination provides the necessary controls for managing altitude effectively, allowing for adjustments in the vertical and horizontal navigation parameters as needed. It is crucial for pilots to understand how each function on the FCP interacts and contributes to safe and efficient flight operations.