During which type of turbulence is in-flight service impossible?

In-flight service becomes impossible during severe turbulence due to the significant and erratic movement of the aircraft, which can pose a serious safety risk to both the crew and passengers. This level of turbulence can cause abrupt changes in altitude and attitude, making it difficult for crew members to navigate the aisles safely. It often requires passengers to be seated with their seatbelts fastened, further complicating any attempt to serve food or beverages.

Severe turbulence is characterized by large, abrupt changes in altitude and speed, making the cabin environment unpredictable and unsafe for in-flight operations. Unlike light or moderate turbulence, where service might continue with some caution, severe turbulence necessitates the suspension of all service activities to ensure the safety of everyone on board. Extreme turbulence, while also dangerous, is typically less commonly encountered, and crew members are trained to recognize severe turbulence as the situation where service should be halted.