How are the standby instruments powered?

The standby instruments in the T-6 are powered by both the battery bus and the auxiliary battery. This configuration ensures that in the event of a failure in the primary power sources, the standby instruments remain operational, providing critical flight information to the pilot. The combination of the battery bus and the auxiliary battery creates a reliable backup system that is essential for instrument functionality during emergencies or power interruptions.

Utilizing both the battery bus and auxiliary battery enhances redundancy, allowing the instruments to continue functioning even if other power sources fail. This is particularly important in aircraft systems where continuous monitoring and access to flight data are vital for maintaining safety.

Other options do not provide the same level of reliability. For instance, relying solely on the main electrical bus or the primary battery could lead to a situation where instrument power is lost if those systems fail. Likewise, direct power from the generator may not offer the necessary contingency if there is an electrical failure within the generator itself.