Which component is indicated by a fault when the BUS TIE illuminates?

When the BUS TIE illuminates, it indicates an issue with the power tie circuit. The BUS TIE is a vital part of the electrical system in the T-6A, functioning to connect different electrical buses. This connection allows for the sharing of electrical power among buses, which is essential for maintaining power during various flight operations and ensuring critical systems remain operational.

If the BUS TIE light comes on, it signals a fault that has disrupted the functionality of the power tie circuit. This could be due to a failure in the components that manage the electrical distribution, such as various switches, relays, or the circuit itself. Understanding this functionality is crucial for pilots in diagnosing electrical issues during flight.

The auxiliary battery, main bus power, and emergency systems are important parts of the electrical system, but they do not directly relate to the BUS TIE indication. The BUS TIE specifically pertains to the interconnection ability of the power tie circuit, making it essential for identifying potential electrical power problems.