The right igniter is powered by which bus?

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Prepare for the Engines Auxiliary Power Unit APU Test with our comprehensive quiz, featuring flashcards and multiple choice questions. Gain insight into essential concepts and enhance your knowledge to excel in your 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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