When is the Sterile Flight Deck light illuminated?

The Sterile Flight Deck light is illuminated after the cabin door is closed and prior to surface movement, signaling that the crew must focus on their critical duties related to the flight's safety. This phase starts once the aircraft is secured and ready to taxi, ensuring that distractions from cabin personnel and other non-essential activities are minimized.

During this time, the cockpit crew is engaged in a series of important checks and preparations for takeoff, where their attention must be undivided to ensure safe operations. Cabin crew is also aware that during this period, they should limit their communications with the cockpit to only essential matters. This practice enhances safety by reducing the likelihood of distractions, allowing the flight crew to concentrate fully on their tasks.

The other options refer to phases of flight that do not specifically correlate with the designated purpose and timing of the Sterile Flight Deck light's illumination, which is specifically tied to the operations before the aircraft begins moving on the runway.