What is wake turbulence separation and when does it apply?

• A. The communications protocol for cockpit to tower.
• B. The de-icing procedure for final approach.
• C. The maximum allowed speed difference between consecutive aircraft.
• D. The required spacing and time to avoid wake vortices from a preceding aircraft affecting following traffic.

Answer: (D)

Wake turbulence separation is the spacing and timing used to keep following aircraft out of the wake vortices created by the aircraft ahead. Wake vortices are rotating air left behind by a flying plane, and if a following aircraft encounters them, it can experience unexpected rolling or altitude loss. The risk is greatest when the leading aircraft is heavier, since heavier jets generate stronger vortices that persist longer and sink toward the flight path. Because of this, controllers and pilots apply specific separation during critical phases like takeoff and landing when aircraft are close on the same runway or in nearby paths, and also when winds could carry vortices into the path of following traffic. The goal is to ensure enough time and distance for these vortices to dissipate or move away before the next aircraft arrives. The other options describe unrelated concepts such as cockpit communications, de-icing, or speed differences, which do not involve wake turbulence.