Order 7110.65P, Air Traffic Control, with changes

2/19/047110.65PFIG 8−4−7Separation MethodsFIG 8−4−8Reduction of Route Protected AirspaceNOTE−(See FIG 8−4−7.) Distance “a” (50 miles) and “b”(30 miles) are determined at the last point of protectedairspace overlap. The sum of the distances “a” and “b”(80 miles) establishes the lateral separation minimaapplicable for either flight after it passes beyond theintersection. For example, Aircraft B could be cleared to,or through, Aircraft A’s altitude after passing point “r.”b. At and above FL 240, reduce the width of theprotected airspace to 10 miles on each side of theroute centerline to a distance of 114.29 miles from theNAVAID, then increasing in width on a 5 angle fromthe route centerline, as measured at the NAVAID, tothe maximum width allowable within the lateralminima; for example, 60 miles of protected airspaceon each side of the centerline; i.e., a lateral separationminimum of 120 miles. (See FIG 8−4−9.)FIG 8−4−9Reduction of Route Protected Airspace8−4−3. REDUCTION OF ROUTE PROTECTEDAIRSPACEWhen routes have been satisfactorily flight checkedand notice has been given to users, reduction in routeprotected airspace may be made as follows:a. Below FL 240, reduce the width of the protectedairspace to 5 miles on each side of the route centerlineto a distance of 57.14 miles from the NAVAID, thenincreasing in width on a 5 angle from the routecenterline, measured at the NAVAID, to themaximum width allowable within the lateral minima;for example, 50 miles of protected airspace on eachside of centerline; i.e., a lateral minimum of100 miles. (See FIG 8−4−8.)Lateral Separation8−4−3