To make a cabin announcement on the PA system, what should you do?

• A. Press the PA switchlight on the Interphone Control Unit after selecting the transmit switch on the ACP to the PA position.
• B. Use the handset microphone to speak into the cabin
• C. Activate the PA by pressing the cabin interphone button
• D. Speak into the microphone on the pilot’s control panel

Answer: (A)

To make a cabin announcement you must route the cockpit microphone signal to the cabin PA and turn the PA path on. First, select the PA position on the Audio Control Panel so the cockpit mic is sent to the cabin PA channel. Then press the PA switchlight on the Interphone Control Unit to enable the cabin PA transmitter, which actually drives the cabin speakers. Without selecting PA on the ACP, your voice won’t reach the cabin; without pressing the PA switchlight, the PA path stays muted. Using the handset microphone or the pilot’s panel mic wouldn’t transmit to the cabin in normal operation, and simply pressing a cabin interphone button doesn’t engage the PA path itself. This two-step process ensures your announcement is heard clearly in the cabin.