When is 'wake turbulence' typically most severe?

• A. During cruise flight
• B. When flying in foggy conditions
• C. During takeoff and landing phases, particularly behind larger aircraft
• D. During flight at high altitudes

Answer: (C)

Wake turbulence is most severe during takeoff and landing phases, particularly behind larger aircraft due to the aerodynamic forces at play during these critical periods of flight. When an aircraft takes off or lands, it generates vortices from its wingtips. These vortices are strong and can persist in the air for a significant amount of time, particularly after large aircraft like heavy jets, which produce more substantial wake turbulence due to their size and weight.

Additionally, the dynamics at low altitudes, especially near the ground, do not allow for the dispersion of these vortices as they do at higher altitudes. Therefore, the risk of encountering wake turbulence is heightened when aircraft are close to the ground, during takeoff and landing, making this situation particularly hazardous for following aircraft, especially those that are smaller and lighter. The FAA and other aviation authorities emphasize the importance of maintaining safe separation distances during these phases of flight to mitigate the risks associated with wake turbulence.