When the EMER/NORM switch is set to EMER, which audio is prioritized?

When the EMER/NORM switch is set to EMER, the system prioritizes headset audio. This configuration is designed to ensure that the most critical audio communications reach the pilot or crew without distraction from other noises. In emergency situations, clear communication is vital, and headset audio provides a direct, noise-canceling means of communication, facilitating better understanding and response to urgent messages.

The choice of headset audio over other audio channels, such as background noise, normal channel audio, or overhead speaker audio, underscores the necessity of isolating important instructions or alerts in high-stress scenarios. Background noise might be distracting in emergencies, while normal channel audio and overhead speakers may not provide the direct clarity needed for immediate decision-making. Consequently, prioritizing headset audio in these instances helps maintain focus and ensures that critical communications are efficiently conveyed.