When testing the PA button, what must the FWD and AFT FAs verify regarding the volume?

The correct answer emphasizes the importance of ensuring that the volume of the PA (Public Address) system is adequate over the Passenger Service Unit (PSU) speakers. This is crucial for effective communication with passengers, especially during boarding, safety announcements, or in the event of an emergency.

FWD (Forward) and AFT (Aft) Flight Attendants must check that the sound is clear and at a suitable level so that all passengers can hear the announcements without difficulty. This ensures proper functioning of the PA system and enhances safety by keeping passengers informed.

The other choices, while related to volume, do not meet the requirements for an effective PA system check. For example, stating that the volume is too loud or not audible does not indicate proper operation, while volume only being audible in the cockpit would mean that passengers are not receiving necessary information, which is not acceptable in a cabin environment. Thus, verifying that the volume is adequate over the PSU speakers is the right approach to ensure that communication reaches everyone on board effectively.