What is the separation requirement between close parallel runways?

The correct answer regarding the separation requirement between close parallel runways is that they must be less than 2,500 feet apart. This requirement is in place to ensure safe operations, particularly during takeoff and landing phases, as well as to streamline air traffic control and minimize the risk of runway incursions.

When parallel runways are configured closely, specific operational procedures are implemented to maintain safety and efficiency. Less than 2,500 feet of separation allows for efficient use of airspace while providing sufficient distance to reduce the risk of wake turbulence, which is critical given the increased traffic and operations associated with parallel runway designs.

Options indicating separations of greater distances (like 1,500 feet, 3,500 feet, or 4,000 feet) do not align with standard operational practices. A separation less than 1,500 feet would not meet safety norms, as it would lead to inadequate safety margins, while values above 2,500 feet signify more generous spacing that is typically reserved for more expansive configurations, such as runways designed to accommodate different departure and arrival paths without interference. Therefore, the requirement of less than 2,500 feet optimally balances safety and operational efficiency for close parallel runways.