When is the sterile light illuminated in an aircraft?

The sterile light in an aircraft is illuminated to indicate a critical phase of flight where cabin crew should refrain from any non-essential duties and remain attentive to instructions and passenger needs. This typically occurs during operations below 10,000 feet, which encompasses both the takeoff and landing phases, when safety is most crucial due to increased potential for emergencies and the need for clear communication.

Understanding this context helps ensure that crew members and passengers are aware of the heightened importance of communication and safety awareness during these phases of flight. The light serves as a clear visual cue for the crew to focus entirely on their safety responsibilities, thereby enhancing overall safety aboard the aircraft.