Aircraft provided positive control with air search radars that do not rotate in excess of 7 rpm shall be separated by a minimum of ___ miles.

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Multiple Choice

Aircraft provided positive control with air search radars that do not rotate in excess of 7 rpm shall be separated by a minimum of ___ miles.

The key idea here is how radar update rate affects safe separation. When aircraft are under positive control using an air search radar, the controller relies on periodic radar updates to know where each aircraft is and to ensure they stay apart. The rotation speed of the radar determines how often those position updates come in. If the radar rotates no more than seven times per minute, updates come relatively infrequently, so aircraft can move between sweeps in ways that aren’t immediately visible to the controller. To keep a safe buffer and still have time to notice and respond to any unexpected movement, a larger separation is required. Five miles provides that practical margin for tracking accuracy and timely intervention given this slower update rate. If the radar rotated faster, more frequent updates would allow tighter spacing because the controller has more current information about each aircraft’s position and trajectory. The other distances would be too large or too small for this specific update cadence, given the requirement that the radar not exceed seven revolutions per minute.

The key idea here is how radar update rate affects safe separation. When aircraft are under positive control using an air search radar, the controller relies on periodic radar updates to know where each aircraft is and to ensure they stay apart. The rotation speed of the radar determines how often those position updates come in. If the radar rotates no more than seven times per minute, updates come relatively infrequently, so aircraft can move between sweeps in ways that aren’t immediately visible to the controller. To keep a safe buffer and still have time to notice and respond to any unexpected movement, a larger separation is required. Five miles provides that practical margin for tracking accuracy and timely intervention given this slower update rate.

If the radar rotated faster, more frequent updates would allow tighter spacing because the controller has more current information about each aircraft’s position and trajectory. The other distances would be too large or too small for this specific update cadence, given the requirement that the radar not exceed seven revolutions per minute.

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