Final answer:
The FWD and AFT pushbuttons are used to activate the forward and aft call systems in an aircraft, allowing passengers to signal flight attendants for assistance.
Step-by-step explanation:
The question refers to the functions of the FWD (Forward) and AFT (Aft) pushbuttons located on an aircraft's call panel. These pushbuttons are used to activate the forward and aft call systems, allowing passengers to alert the cabin crew if they require assistance. When a passenger presses either of these buttons, an indicator light will activate in the cabin, and an audible chime or alert will be sent to the flight attendants, typically via their attendant indicator panels. It's important for flight attendants to promptly respond to these calls to maintain passenger safety and comfort.