How long before expected turbulence should the seatbelt sign be turned on?

Turning on the seatbelt sign at least 5 minutes prior to expected turbulence is important for ensuring passenger safety and preparedness. This timeframe allows for adequate communication with passengers about the impending turbulence so they can secure themselves and any loose items.

The 5-minute window is generally viewed as sufficient for cabin crew to make announcements and for passengers to respond accordingly. It ensures that everyone is aware of the potential for turbulence and has time to prepare, enhancing the overall effectiveness of safety measures in flight.

This approach is consistent with established safety protocols that prioritize both timely communication and passenger preparedness in the event of unexpected flight conditions.