If a NAVAID is also a waypoint on the flight plan, how can it be displayed on the ND map?

To display a NAVAID that is also a waypoint on the flight plan on the Navigation Display (ND) map, pushing the FLT PLN button on the Multi-Function Control (MFC) is the correct method. When this button is pressed, the ND will transition to show the flight plan information, including any waypoints along the route, such as NAVAIDs that have been included in the flight plan.

This option effectively allows the pilot to visualize critical navigational information and understand the flight path in relation to both the waypoints and the NAVAIDs. By doing so, pilots can ensure more accurate navigation and situational awareness while flying.

The other choices do not directly lead to the display of the NAVAID as a waypoint on the ND map. For instance, while selecting FLT PLN on the Multi-Function Display (MCD) might provide information relevant to the flight plan, it does not influence the presentation on the ND. Similarly, pushing the DATA button or selecting BCN on the MFC serves different functions that do not pertain to showing the flight plan waypoints. Hence, the most efficient and relevant way to display the desired information on the ND is by using the FLT PLN button on the MFC.