Longitudinal separation must be applied so that the spacing between the estimated positions of the aircraft being separated is never less than a prescribed minimum.
NOTE: Consider separation to exist when the estimated positions of the aircraft being separated are never less than a prescribed minimum.
In situations where one aircraft requires a different time-based longitudinal standard than another, apply the larger of the two standards between the aircraft concerned.
Longitudinal separation expressed in distance may be applied as prescribed in Chapter 6, Nonradar.
In situations where an update to a control estimate indicates that the minimum being applied no longer exists, controllers must ensure that separation is reestablished. Issue traffic information as necessary.