What action should be taken by cabin crew during expected turbulence?

During expected turbulence, it is essential for cabin crew to prioritize the safety of passengers. Making a public announcement (PA) to reinforce the need for passengers to be seated is the most appropriate action because it helps to ensure that everyone is secured in their seats, which significantly minimizes the risk of injuries caused by sudden jolts or movements of the aircraft.

This action also serves to communicate to passengers the seriousness of the situation without inciting panic, as they are reminded of the appropriate safety protocols during turbulent conditions. Keeping passengers informed helps maintain a calm environment, allowing the cabin crew to effectively manage any other tasks that may arise during the turbulence.

Continuing in-flight service as normal disregards the potential safety hazards associated with turbulence, while beginning emergency evacuation procedures would be appropriate only in cases of significant danger, which is not typically the case during expected turbulence. Turning off cabin lights is also unnecessary during turbulence, as visibility is not dramatically impaired and normal cabin lighting can help reassure passengers and maintain order.