How many units make up the Primary Flight Display?

The Primary Flight Display (PFD) on the A320 is made up of four distinct units, which work together to present critical flight information to the pilots efficiently. Each unit within the PFD displays specific data such as altitude, airspeed, heading, and attitude, ensuring that pilots have a comprehensive view of the aircraft's current operational status.

The multiple units enhance redundancy and reliability; if one unit were to fail, the remaining units could still provide essential flight data to maintain operational safety. This design reflects a commitment to ensuring that crucial instruments remain accessible and functional under various conditions, promoting better situational awareness for the flight crew. Thus, understanding that the PFD comprises four units helps in grasping the importance of instrument reliability and pilot awareness in aviation safety.