ERJ-145 Electrical Practice Test

What is the role of the APU generator in electrical distribution?

It powers cabin lights only. It provides an additional AC power source, often powering essential and/or main AC buses when engines are not driving generators. It powers the landing gear. It is used only on the ground and not during flight.

Correct Answer:

It provides an additional AC power source, often powering essential and/or main AC buses when engines are not driving generators.

Explanation:

The APU generator serves as an extra AC power source for the aircraft’s electrical distribution. It can feed the essential and main AC buses when the engine-driven generators aren’t available or during engine start, ensuring vital systems, avionics, lighting, and other electrical loads stay powered. This power source is not limited to cabin lighting and it isn’t restricted to ground use; it can be used in flight as well if required.

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