What is the function of the annunciator panel in the aircraft’s electrical system?

• A. It alerts the crew to system status and faults
• B. It powers the engine
• C. It provides navigation data
• D. It controls autopilot

Answer: (A)

Annunciator panels alert the crew to electrical system status and faults, giving quick, at-a-glance indications of what’s normal and what needs attention. They pull signals from power sources like generators and batteries, as well as essential electrical buses, and present them with lights and alarms. When conditions are healthy, indicators stay quiet; when something changes—such as a generator failure, a low battery, or a bad bus—the panel lights up red or amber and may trigger an audible warning. This immediate feedback helps pilots quickly assess the situation, ensure critical electrical power remains available, and decide on the appropriate backup actions. It doesn’t power the engine, provide navigation data, or control autopilot, which are functions of the propulsion system, navigation systems, and flight control systems, respectively.