- The separation used when aircraft position information is derived from radar sources (ICAO). The traffic is spaced out in accordance with the established minimums. The separation minimums are basically 5 NM and, at the discretion of the authority, when within 40 NM of the radar and below flight level 245, 3 NM; both these assume that primary and secondary radars are available. If only the secondary is available, then the radar separation is 8 NM.
Aviation dictionary. 2014.
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