Which category of aircraft is affected for 2 minutes of wake turbulence behind Category B or C?

• A. Category A
• B. Category D
• C. Category H
• D. Category B and C

Answer: (D)

The correct choice pertains to the impact of wake turbulence generated by aircraft categorized as B (small jets) and C (large aircraft). The two-minute wake turbulence separation standard is particularly significant because it is informed by the strength and duration of the wake vortices produced by these aircraft, which can pose a hazard to following aircraft, particularly smaller ones.

When aircraft in categories A and D follow either category B or C, they are likely to encounter wake turbulence during the initial two minutes after the leading aircraft has passed. This timeframe is crucial because wake vortices, which include rolling motions that can destabilize an aircraft, dissipate over time. Hence, the recommendation for a two-minute separation helps ensure safety, giving trailing aircraft enough time and distance to avoid these potentially dangerous air currents.

Categories H (heavy) and B/C do not generate a similar concern when considering wake turbulence, but rather reinforce the importance of maintaining appropriate separation for those aircraft classified within categories B and C. Each of these categories has distinct characteristics which influence the model for risk evaluation during approach, departure, or holding patterns in aviation contexts.