In non-radar conditions, what is the minimum lateral separation required below FL600?

In non-radar conditions, the minimum lateral separation required below FL600 is 5 miles. This standard helps ensure safe separation between aircraft when radar data is not available. The 5-mile lateral separation is established to account for potential inaccuracies in pilot navigation and to provide an adequate buffer zone between aircraft, which is particularly important when flying in congested airspace or during poor visibility conditions. This measure is part of the procedures to maintain air safety and to minimize the risk of mid-air collisions.

When considering the other options, 2.5 miles, 10 miles, and 3 miles do not meet the regulatory requirements established for non-radar separation, which is specifically set at 5 miles in order to provide an effective and safe distance between aircraft operating under these conditions.