What is the minimum separation time for an aircraft departing behind a Category E aircraft on the same runway?

• A. 2 minutes
• B. 3 minutes
• C. 4 minutes
• D. 5 minutes

Answer: (A)

The correct minimum separation time for an aircraft departing behind a Category E aircraft on the same runway is 2 minutes. This requirement is based on the need to ensure safe wake turbulence separation. Category E aircraft, which are typically larger, generate significant wake turbulence that can affect a following aircraft during takeoff.

By specifying a 2-minute separation, air traffic control provides adequate time for the wake turbulence from the Category E aircraft to dissipate, allowing the subsequent departing aircraft to safely lift off without encountering hazardous conditions. This time frame has been established to help mitigate the risks associated with wake turbulence while balancing operational efficiency at airports.

Other options suggest longer separation times, which are unnecessary for ensuring safety when the 2-minute rule suffices under standard conditions. The guidelines are designed to optimize air traffic flow while still prioritizing safety for all aircraft involved.