When simultaneous instrument approaches are being conducted to parallel runways, ATC employs a no-transgression zone (NTZ) of variable dimensions to monitor and ensure proper separation, as depicted below. The FAA's Aeronautical Information Manual has lots more detail on the various ways NTZs are implemented, which aren't really relevant to VFR pattern operations at either towered or non-towered airports.
Airports and their runways come in all shapes and sizes, from turf strips lacking any real markings, but with trees at both ends, to massive, busy, complicated affairs like ATL, DFW, JFK or ORD. And p…
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