Which event results in loss of the engine NG indication and activation audio?

• A. Interruption of the NG signal from the alternator
• B. Failure of the cockpit NG switch
• C. Overheat of the engine bay
• D. Loss of hydraulic pressure

Answer: (A)

The engine NG indicator and its activation audio depend on a continuous NG signal fed to the cockpit from the engine system. If the NG signal from the alternator is interrupted, there’s no data to display and no audio annunciation to trigger, so both the NG indication and the associated audio are lost. Other issues—like a cockpit NG switch failure, engine bay overheating, or loss of hydraulic pressure—do not cut the NG data feed in the same way or they affect different warnings, so they wouldn’t produce the same combined loss of NG readout and audio.