What is the correct minimum spacing for same runway landing operations with dissimilar aircraft?

The correct minimum spacing for same runway landing operations with dissimilar aircraft is 6,000 feet. This requirement is essential for ensuring safety during landing operations, particularly when different types of aircraft are involved, as they may have varying landing speeds, weights, and wake turbulence characteristics.

The 6,000 feet spacing is designed to provide sufficient separation time and distance, minimizing the risk of wake turbulence encounters that could affect the subsequent landing aircraft. Wake turbulence can be particularly hazardous, especially when smaller aircraft are landing behind much larger ones, as the vortices created by the larger aircraft persist for some time.

In contrast, the other distances provided in the choices either do not meet the regulatory safety standards or do not allow for a safe operational margin when dissimilar aircraft are landing on the same runway. Maintaining the specified minimum spacing is critical for ensuring the safety of all aircraft in the landing sequence, ultimately helping to prevent accidents related to misjudged spacing or wake turbulence.