Which turbulence intensity allows for food service and walking but may cause erratic movements?

The correct answer is Light turbulence. In the context of aviation, Light turbulence is characterized by slight, erratic changes in altitude and attitude, which passengers might experience as mild bumps. It’s typically manageable enough to allow for food service and for passengers to walk about the cabin safely. However, there may be some instances where individuals could feel light jolts or movements, which can be described as erratic.

Moderate turbulence, on the other hand, can lead to more significant changes in altitude and attitude, making food service difficult and generally advisable to avoid moving about the cabin. Severe and extreme turbulence conditions present much stronger forces that could result in considerable difficulty for both passengers and crew and would certainly restrict movement and food service altogether. Understanding these classifications is crucial for ensuring the safety and comfort of everyone on board during flight.