Which parameters are permanently displayed on the bottom of the System Display (SD)?

The correct choice highlights the parameters that are consistently shown at the bottom of the System Display (SD) on the A320. These include Total Air Temperature (TAT), Static Air Temperature (SAT), Coordinated Universal Time (UTC), and Gross Weight.

The reason for these parameters being permanently displayed relates to their significance in flight operations. TAT and SAT are crucial for understanding aircraft performance and environmental conditions, as they provide vital information influencing engine performance and aerodynamic efficiency. UTC is important for navigation and timing, allowing pilots to coordinate with air traffic control and maintain situational awareness. Gross Weight is essential for performance calculations, including takeoff and landing distance, as it informs the crew about the aircraft's load status.

The other choices feature parameters that, while important for flight operations, are not fixed at the bottom of the SD. For instance, altitude, speed, heading, and fuel flow can change frequently and are usually shown in different parts of the display system. Similarly, engine RPM, hydraulic pressure, electrical load, and cabin temperature are monitored but appear in specific contexts rather than as permanent display elements. The final option includes variables that are crucial for flight management but likewise are not displayed consistently along the bottom of the SD. Therefore, the highlighted parameters