Under what conditions do the seatbelt signs automatically illuminate when the SEAT BLTS switch is set to AUTO?

When the SEAT BLTS switch is set to AUTO, the seatbelt signs illuminate automatically based on specific conditions that ensure passenger safety during critical phases of flight.

Cabin altitude exceeding 8,500 feet triggers the seatbelt sign to illuminate as a warning for passengers to fasten their seatbelts, since higher altitudes can create a turbulence environment and the potential for rapid decompression.

The extension of landing gear also activates the seatbelt sign. This is because landing gear extension typically occurs during the approach phase of landing, where passengers are advised to be securely fastened for safety, as the aircraft is transitioning to a slower speed and may encounter turbulence.

When the flaps are set to greater than 0 degrees, this indicates the aircraft is preparing for landing or takeoff. In these scenarios, it is crucial that passengers have their seatbelts fastened to manage the increased likelihood of turbulence and ensure safety during the critical takeoff or landing phases.

Since all these conditions contribute to passenger safety, the seatbelt signs illuminate automatically under any of these situations when the SEAT BLTS switch is in the AUTO setting. This comprehensive approach underscores the importance of maintaining safety measures throughout various phases of flight, calling for coordinated awareness among passengers and crew