Order 7110.65P, Air Traffic Control, with changes

7110.65P 2/19/04b. Intersecting flight paths with constant and samewidth protected airspace when either aircraft is at orbeyond a distance equal to the applicable lateralseparation minimum measured perpendicular to theflight path of the other aircraft. (See FIG 8−4−4.)FIG 8−4−4Separation Methodsd. Intersecting flight paths with variable widthprotected airspace when either aircraft is at or beyonda distance equal to the sum of the protected airspaceof both flight paths measured perpendicular to theflight path of the other aircraft. Measure protectedairspace for each aircraft perpendicular to its flightpath at the first point or the last point, as applicable,of protected airspace overlap.NOTE−In FIG 8−4−5, the protected airspace for westboundflight A is distance “a” (50 miles), and for southwestboundflight B, distance “b” (10 miles). Therefore, the sum ofdistances “a” and “b”; i.e., the protected airspace ofAircrafts A and B, establishes the lateral separationminimum (60 miles) applicable for either flight relevant tothe other.FIG 8−4−6Separation Methodsc. Intersecting flight paths with constant butdifferent width protected airspace when eitheraircraft is at or beyond a distance equal to the sum ofthe protected airspace of both flight paths measuredperpendicular to the flight path of the other aircraft.(See FIG 8−4−5.)FIG 8−4−5Separation MethodsNOTE−(See FIG 8−4−6.) At the first point of protected airspaceoverlap, the protected airspace for westbound flight A isdistance “a” (50 miles), and for southbound flight B,distance “b” (40 miles). The sum of distances “a” and “b”(90 miles) establishes the lateral separation minimumapplicable in this example for either flight as it approachesthe intersection. For example, Aircraft B should bevertically separated from Aircraft A by the time it reachespoint “p.”8−4−2Lateral Separation