The right igniter is powered by which bus?

Study for the Engines Auxiliary Power Unit Test. Prepare with multiple choice questions. Each question comes with hints and explanations. Ensure you're ready for the exam!

Multiple Choice

The right igniter is powered by which bus?

Explanation:
Ignition must stay energized even when the airplane’s electrical system is in an abnormal state. The AC standby bus is the part of the electrical system that remains powered to essential/flight-critical loads when other power sources may be unavailable. By tying the right igniter to this standby bus, it stays energized during start and under electrical fault conditions, ensuring a reliable ignition for the engine. The main AC bus, DC bus, or an APU-specific bus aren’t guaranteed to stay powered in those conditions, so they wouldn’t reliably support ignition when it’s most needed.

Ignition must stay energized even when the airplane’s electrical system is in an abnormal state. The AC standby bus is the part of the electrical system that remains powered to essential/flight-critical loads when other power sources may be unavailable. By tying the right igniter to this standby bus, it stays energized during start and under electrical fault conditions, ensuring a reliable ignition for the engine. The main AC bus, DC bus, or an APU-specific bus aren’t guaranteed to stay powered in those conditions, so they wouldn’t reliably support ignition when it’s most needed.

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