Standard radar separation in ERAM, between two single aircraft operating below FL600 is 1000 feet vertically, and what metric laterally/longitudinally?

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Consider the question’s context: standard radar separation in ERAM for two single aircraft below FL600, with 1000 feet vertical separation, and determine the corresponding lateral/longitudinal separation metric.
Option 1: 3NM. This value is smaller than widely used standard separations in many radar environments and would generally be insufficient to maintain safe separation with typical radar accuracy and track uncertainty, making it an unlikely choice for standard ERAM separation below FL600.
Option 2: 10NM. A 10 nautical mile lateral/longitudinal separation is typically used in broader en route or terminal-area procedures when higher confidence margins are required, or in special conditions, but it is larger than the standard baseline separation specified for this context, so it is not the expected value here.
Option 3: 6NM. While 6NM sits between 5NM and 10NM and could be imagined as a compromise in some procedures or certain airspace configurations, the standard ERAM rule in this specific scenario is not 6NM; it does not align with the conventional pairing of 1000 feet vertical separation with a 5NM lateral/longitudinal standard.
Option 4: 5NM. This option matches the conventional standard separation paired with 1000 feet of vertical separation for single-track ERAM operations below FL600, reflecting the typical radar-based lateral/longitudinal separation metric used to maintain safe spacing between aircraft in this regime.
In summary, the other options fail to align with the established baseline separation norms for this scenario, either by being too small, too large, or not the standard pairing, whereas 5NM is the recognized lateral/longitudinal separation metric that corresponds with a 1000-foot vertical separation for single aircraft below FL600.

AT 405 Mid Term Exam

Standard radar separation in ERAM, between two single aircraft operating below FL600 is 1000 feet vertically, and what metric laterally/longitudinally?

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