When utilizing VNAV for flight guidance, where must VNAV altitudes be displayed?

The correct answer indicates that when utilizing Vertical Navigation (VNAV) for flight guidance, VNAV altitudes must be displayed on the Multifunction Display (MFD) map page or the Control Display Unit (CDU) legs page. This requirement ensures that pilots have immediate visual access to critical altitude information required for vertical navigation during flight operations.

Displaying VNAV altitudes on the MFD or CDU legs page allows for easy tracking of altitude restrictions, waypoints, and the overall trajectory of the flight path. This visibility is crucial for effective decision-making and maintaining compliance with the planned vertical profile, especially during descent and approach phases of flight.

Utilizing these displays also enhances situational awareness, as pilots can monitor the current VNAV status against the designed flight path and adjust flight parameters as necessary. This accessibility of information is vital for maintaining safety and efficiency in operations.

The other options lack the functionality or relevance necessary for realtime altitude monitoring in the context of VNAV. The primary navigation display, while important for overall navigation, does not specifically serve to show VNAV altitudes in the same dedicated manner as the MFD map or CDU legs page. An altimeter setting page is primarily for setting and referencing altimeter pressure rather than for VNAV altitude