Under precision runway monitoring, the minimum separation distance is within which range?

• A. Less than 4300 ft
• B. Less than 4300 ft but no less than 3000 ft
• C. More than 4300 ft
• D. Exactly 4300 ft

Answer: (B)

Under precision runway monitoring, two aircraft on final approaches to parallel runways are allowed to be closer than standard radar separation, but only within a defined range. The minimum spacing must be at least 3,000 feet and less than 4,300 feet. This range provides enough margin for safe maneuvering and reaction time while still leveraging the capacity gains PRM offers. If spacing were smaller than 3,000 feet, safety margins could be compromised; if it were 4,300 feet or more, you’d be operating more like conventional separation, not taking full advantage of PRM capabilities.