If the alternator power supply providing the NG signal is interrupted, which indication and audio will be affected?

If the alternator power supply providing the NG signal is interrupted, which indication and audio will be affected?

• A. Engine Out
• B. NG Indication
• C. Oil Pressure Warning
• D. Fuel Quantity Alarm

Answer: (A)

The key idea is that the Engine Out warning and its associated audio rely on the NG (gas generator speed) data to detect an engine loss. If the alternator supplying the NG signal is interrupted, the system no longer has reliable NG information to determine one engine is out, so the Engine Out indication and its audible alert become inoperative or unreliable. The other warnings (oil pressure, fuel quantity, or an NG readout) aren’t driven directly by that NG power feed in the same way, so they aren’t the indication most affected by this particular power interruption.

The key idea is that the Engine Out warning and its associated audio rely on the NG (gas generator speed) data to detect an engine loss. If the alternator supplying the NG signal is interrupted, the system no longer has reliable NG information to determine one engine is out, so the Engine Out indication and its audible alert become inoperative or unreliable. The other warnings (oil pressure, fuel quantity, or an NG readout) aren’t driven directly by that NG power feed in the same way, so they aren’t the indication most affected by this particular power interruption.