What is the minimum altitude separation for helicopters in Marshal?

The minimum altitude separation for helicopters in a marshal stack is 500 feet. This is established to ensure safety and operational efficiency when managing helicopter traffic, which often operates at lower altitudes compared to fixed-wing aircraft. The 500-foot separation provides a buffer that helps to prevent potential collisions and allows for adequate response time should a helicopter need to make altitude adjustments during departure or arrival sequences.

The 500-foot separation is particularly crucial in the context of helicopter operations, where the flight paths can be more variable due to their ability to hover, perform quick maneuvers, and operate in tighter spaces. This altitude buffer is critical for maintaining safe vertical separation, especially in busy air traffic environments where multiple helicopters may be operating in a short vertical and horizontal operational space.