What does the RH MASTER switch supply power to?

The RH MASTER switch is designed to control the electrical power distribution in the aircraft. When activated, it specifically supplies power to the RH MAIN and RH ESS buses. The RH MAIN bus is responsible for powering various systems essential for normal flight operations, while the RH ESS (Essential) bus provides power to critical systems that are vital for safety and operation during emergency conditions. This includes key avionics equipment that the flight crew relies on for navigation, communication, and monitoring aircraft systems. The designed functionality of the RH MASTER switch ensures that power is effectively directed to these important systems, allowing the aircraft to function safely and reliably.

In contrast, other options such as the entire emergency lighting system, fuel shutoff valves, and electrical control systems are supplied by different switches or systems that have distinct roles in aircraft operations. Thus, the RH MASTER switch's specific role in supplying power to the RH MAIN and RH ESS buses is crucial for ensuring the effective operation of essential avionics.