What is the normal power source for the AC ESS BUS?

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Multiple Choice

What is the normal power source for the AC ESS BUS?

Explanation:
The essential AC bus is kept powered by the primary AC power source so that critical systems stay alive in normal operation. In most aircraft, the engine-driven generator on the first engine feeds AC Bus 1, and the essential bus is tied to that bus, making AC Bus 1 the normal source for the AC essential bus. This arrangement ensures important navigation, avionics, and flight-control systems receive power even as other systems may shed load. If AC Bus 1 isn’t available, the essential bus can be fed from AC Bus 2 via the tie, or from external/APU power when appropriate.

The essential AC bus is kept powered by the primary AC power source so that critical systems stay alive in normal operation. In most aircraft, the engine-driven generator on the first engine feeds AC Bus 1, and the essential bus is tied to that bus, making AC Bus 1 the normal source for the AC essential bus. This arrangement ensures important navigation, avionics, and flight-control systems receive power even as other systems may shed load. If AC Bus 1 isn’t available, the essential bus can be fed from AC Bus 2 via the tie, or from external/APU power when appropriate.

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