What is indicated by the acronym FSB in aviation?

The acronym FSB in aviation is indicated as the Fasten Seatbelt Sign. This sign is an essential safety feature in aircraft that informs passengers when they need to buckle their seatbelts. It is typically illuminated during critical phases of flight such as takeoff, landing, or when the pilot anticipates turbulence. Ensuring passengers are securely fastened helps to prevent injuries during unexpected movement of the aircraft.

The other choices do not align with the established terminology in aviation. While Flight Safety Briefing may refer to pre-flight instructions provided by the cabin crew, it is not associated with the acronym FSB. Similarly, Flight Status Bulletin may pertain to updates about flight operations, and Final Service Briefing could imply the concluding announcements made by the crew regarding service; however, none of these correctly represent what the acronym FSB stands for in the aviation context. Thus, identifying the Fasten Seatbelt Sign as FSB emphasizes its critical role in maintaining passenger safety during the flight.