Visual separation may be used instead of distance minima under what condition?

• A. When the succeeding aircraft is a fixed-wing airplane
• B. Only in zero visibility
• C. Only with a special clearance
• D. When the succeeding aircraft is a helicopter

Answer: (D)

Visual separation is allowed when the controller can rely on sight rather than fixed distance numbers to keep aircraft apart. This is specifically applicable when the succeeding aircraft is a helicopter. The helicopter’s slower speed, ability to hover, and highly maneuverable flight profile make it feasible for pilots and controllers to maintain safe separation visually, rather than by rigid minima. This relies on visual meteorological conditions and proper air traffic control procedures; it isn’t used in zero visibility or where instrument separation is required. The other scenarios don’t fit because the enabling factor is the succeeding aircraft being a helicopter.