What systems are powered by the auxiliary battery?

The auxiliary battery is specifically designed to provide power to essential systems that maintain the operational integrity of an aircraft in the event of a primary power failure. Standby instruments, lights, UHF radios, and fire warning systems are critical, as they ensure that a pilot has the necessary information and communication capability during emergencies or system failures.

Standby instruments are vital for aircraft operation, offering the pilot important data when primary systems are compromised. In addition, having lights powered by the auxiliary battery enhances visibility in emergency situations. UHF communication allows for ongoing contact with air traffic control or other aircraft when main power sources are unavailable. Fire warning systems ensure that any potential fire is promptly indicated, enhancing the safety of the crew and passengers during critical situations.

Other listed systems, such as primary flight controls, emergency lighting, or navigation systems typically rely on different power sources or have dedicated backup systems managed separately. Thus, the concentration of the auxiliary battery's support on instruments, lights, UHF, and fire warnings highlights its targeted role in maintaining control and safety during adverse conditions.