How is the primary flight display (PFD) defined?

The primary flight display (PFD) is defined as an electronic display that combines all primary flight instruments into a single screen. This integration streamlines the information available to pilots, providing critical flight data such as altitude, airspeed, attitude, heading, and navigation information in one cohesive interface. This consolidated view enhances situational awareness and allows for quicker decision-making, as pilots can access comprehensive data without having to glance at multiple separate instruments.

Options that suggest the PFD only shows altitude or speed oversimplify its function and fail to recognize the multifaceted data it provides. A definition describing the PFD as merely a backup system for mechanical instruments neglects the advanced technology and data integration that PFDs represent, as they are designed to be the primary source of flight information in modern cockpit systems.