EASA Module 11 Practice Exam

The air data computer takes the pitot and static pressures (and temperature) and converts them into the main air data that pilots rely on: indicated airspeed, Mach number, and altitude. Those data streams feed the instruments that display speed and altitude to the crew. So the air data computer provides input to the Mach meters, the airspeed indicator, and the altimeter. In many installations the cabin pressurization system also uses related data from the same source (cabin rate sensor) to monitor how quickly cabin pressure is changing, which is why that item can appear in the same set of inputs. Standby instruments typically have independent sources, and flight management computers or secondary radar are not direct cockpit display instruments fed by the air data computer. Therefore, the set that best reflects what the air data computer feeds is the Mach meters, the airspeed indicator, the altimeter (with the cabin rate sensor as a related use).