To make a cabin announcement using the Public Address System, what is the first step?

The correct first step to make a cabin announcement using the Public Address System is to move the Transmit Switch on the Audio Control Panel to PA. This action activates the Public Address function, allowing the pilot or flight attendant to communicate through the cabin speakers. By engaging the PA function, the sound is directed to the intended audience within the cabin, enabling the intended announcement to be made clearly and effectively.

In this context, pressing the intercom button is not the first action required to access the cabin announcement system; instead, it is generally used for internal communication between the flight deck and cabin crew. Activating cabin lights is unrelated to the process of making an announcement and does not facilitate communication. Notifying the flight crew, while important for communicate issues, is also not a prerequisite step for utilizing the PA system, as announcements can be made as needed regardless of prior notifications.