What sign illuminates automatically when the "Fasten Seatbelt Sign" is turned on?

When the "Fasten Seatbelt Sign" is turned on, it typically triggers the illumination of the "Return to Seat" sign. This sign serves as an important communication tool in the cabin, alerting passengers that they must return to their seats and fasten their seatbelts in accordance with safety protocols.

This alignment is crucial during takeoff, landing, or turbulence when it's essential for passengers to be seated securely to ensure their safety. The activation of the "Return to Seat" sign reinforces the instruction provided by the fasten seatbelt indication, promoting adherence to safety measures.

The other signs mentioned, such as the exit sign, cabin crew notification sign, and emergency exit sign, serve different purposes and are not directly linked to the activation of the seatbelt sign. The exit sign indicates the location of exits, the cabin crew notification sign alerts crew members, and the emergency exit sign is related to evacuation procedures, thus highlighting the specific focus and importance of the "Return to Seat" sign when the seatbelt sign is illuminated.