The ___ provides the PFD with data consisting of airspeed, altitude, and vertical speed.

• A. Air Data Computer
• B. Attitude and Heading Reference System
• C. Inertial Reference System
• D. Traffic Collision Avoidance System

Answer: (A)

The Air Data Computer provides the PFD with airspeed, altitude, and vertical speed by processing the aircraft’s pitot-static data. It takes measurements from the pitot tube and static ports, converts them into calibrated airspeed, pressure altitude (or indicated altitude), and rate of climb/descent (vertical speed). Those values are then shown on the Primary Flight Display as the airspeed tape, altitude tape, and vertical speed indicator, giving the pilot essential flight data in real time.

The other systems serve different roles: the Attitude and Heading Reference System supplies attitude (pitch and roll) and heading information, not air data; the Inertial Reference System provides inertial position and velocity data; and the Traffic Collision Avoidance System handles traffic advisories and does not feed basic flight-data readings to the PFD.