What must be set to ON for the Air Data Computer to be automatically powered up?

The Air Data Computer (ADC) is essential for providing the aircraft's flight information, including airspeed, altitude, and heading data. For the ADC to automatically power up, the avionics master switch must be set to ON. This switch is responsible for routing power to various avionics systems, including the ADC.

When the avionics master switch is activated, it allows the necessary electrical power to flow to the ADC, enabling it to perform its functions. By ensuring that this switch is turned on, pilots can confirm that all relevant systems, including the ADC, are operational and ready for use during flight preparations and operations.

Other switches, such as the battery or power switches, do play vital roles in the overall electrical system of the aircraft, but it's specifically the avionics master switch that controls the power supply directly to avionics components like the ADC.