Can VHF audio and intercom be heard when the audio toggle switch is set to ALTN?

When the audio toggle switch is set to ALTN (alternative), it functions in a manner that disables both the VHF audio and the intercom system. This is designed for specific operational scenarios where standard communication capabilities are temporarily suspended, often due to safety protocols or during particular phases of flight where communication is not required.

Setting the toggle to ALTN indicates to the system that alternative functionality is in use, thereby muting standard audio input channels, which are critical for pilot communication. Consequently, while the switch is in this position, neither the VHF nor the intercom will relay audio, ensuring that the cockpit environment is adjusted according to the operational requirements of the flight.