Which action is required when inspecting the megaphone on the ERJ 175?

When inspecting the megaphone on the ERJ 175, the requirement to squeeze the handle and listen for audible clicking sounds is essential for confirming that the device is functional. This action ensures that the internal mechanism of the megaphone, which is responsible for sound projection, is operational. The clicking sound indicates that the mechanism is engaging correctly and that the unit is ready for use if needed during an emergency situation or for communication.

While checking battery levels, ensuring sound projection capability, and verifying the megaphone's availability are all important parts of overall readiness and safety checks, the specific action of squeezing the handle and listening for sounds directly tests the operational functionality of the megaphone itself. This direct inspection is critical to ensure that the device will work effectively when it is needed most.