Under what circumstance should all in-flight service be halted according to best practices for turbulence?

Halting all in-flight service is a critical safety measure when turbulence is unexpected. This practice is rooted in ensuring the safety of both passengers and crew members, as unanticipated turbulence can lead to sudden and violent movements of the aircraft. When service is ongoing, flight attendants may be delivering food, beverages, or other items, which can pose a risk of injury if turbulence suddenly occurs. By stopping all service in the face of unexpected turbulence, flight attendants can secure themselves and the cabin environment more effectively, preventing items from becoming projectiles and ensuring that both crew and passengers are prepared for any sudden movements.

While it is important to be vigilant and prepared for expected turbulence or to take precautionary measures when flying at higher altitudes, the most crucial moment to suspend service is during unexpected turbulence. This proactive approach prioritizes safety and aligns with best practices for managing inflight operations during variable conditions.