What is the function of the aircraft's Master Switch?

The function of the aircraft's Master Switch is to enable and control the main electrical power to the aircraft systems. This switch is essential for the operation of various electrical components, such as lighting, avionics, and instruments. By turning on the Master Switch, the pilot allows electrical power to flow to essential systems for operation and monitoring. This action ensures that necessary avionics and systems are powered up before starting the engines or engaging in flight operations.

In an aircraft, managing electrical power is critical for safety and operational efficiency. Without the Master Switch functioning correctly, pilots would not be able to control the power distributed to different systems, potentially leading to malfunction and unsafe conditions.