ENR 2. Air Traffic Services Airspace
See GEN 3.3 and ENR 1.4.
Federal Aviation Administration Twentieth Edition
ENR 3. ATS ROUTES ENR 3.1 Lower ATS Routes
See also ENR 1.10, ENR 1.19, ENR 3.3, ENR 3.5, and Appendix 1.
1. Low Altitude ATS Route Structure
1.1 The U.S. does not use the term “Lower ATS Routes.” The published low altitude route structure in the U.S. consists of VOR Federal airways, L/MF Federal airways and low altitude RNAV routes (T.routes). The low altitude route structure is for use from 1,200 feet above the surface (or in some instances higher) up to but not including 18,000 feet MSL.
1.1.1 Route designators and significant points defining the routes are listed in FAA Order 7400.9, Airspace Designations and Reporting Points.
1.1.2 Applicable route tracks, radials, distances between points, changeover points, cruising altitudes for direction of flight, upper and lower limits, minimum flight altitudes and ARTCC boundaries are published on the IFR Enroute Low Altitude . U.S. chart series.
1.1.3 The low altitude routes are designated as Class E airspace.
Federal Aviation Administration Twentieth Edition
ENR 3.2 Upper ATS Routes
See also ENR 1.10, ENR 1.19, ENR 3.3, ENR 3.5, and Appendix 1.
1. High Altitude ATS Route Structure
1.1 The U.S. does not use the term “Upper ATS Routes.” The published high altitude route structure in the U.S. consists of jet routes and high altitude RNAV routes (Q.routes). The high altitude route structure is for use at and above 18,000 feet MSL.
1.1.1 Jet route and Q.route designators and significant points defining the routes are listed in FAA Order 7400.9, Airspace Designations and Reporting Points.
1.1.2 Applicable route tracks, radials, distances between points, changeover points, cruising altitudes for direction of flight, upper and lower limits, minimum flight altitudes and ARTCC boundaries are published on the IFR Enroute High Altitude .
U.S. chart series.
1.1.3 The high altitude route structure is contained within Class A airspace.
Federal Aviation Administration Twentieth Edition
ENR 3.3 Area Navigation (RNAV) Routes
1. RNAV Routes
1.1 Published RNAV routes, including Q.Routes and T.Routes, can be flight planned for use by aircraft with RNAV capability, subject to any limitations or requirements noted on en route charts, in applicable Advisory Circulars, or by NOTAM. RNAV routes are depicted in blue on aeronautical charts and are identified by the letter “Q” or “T” followed by the airway number (e.g., Q.13, T.205). Published RNAV routes are RNAV.2 except when specifically charted as RNAV.1. These routes require system performance currently met by GPS or DME/DME/IRU RNAV systems that satisfy the criteria discussed in AC 90.100A, U.S. Terminal and En Route Area Navigation (RNAV) Operations.
NOTE.
AC 90.100A does not apply to over water RNAV routes (reference 14 CFR Section 91.511, including the Q.routes in the Gulf of Mexico and the Atlantic routes) or Alaska VOR/DME RNAV routes (“JxxxR”). The AC does not apply to off.route RNAV operations, Alaska GPS routes or Caribbean routes.
1.1.1 Q.routes are available for use by RNAV equipped aircraft between 18,000 feet MSL and FL 450 inclusive. Q.routes are depicted on Enroute High Altitude Charts.
1.1.2 T.routes are available for use by RNAV equipped aircraft from 1,200 feet above the surface (or in some instances higher) up to but not including 18,000 feet MSL. T.routes are depicted on Enroute Low Altitude Charts.
1.2 Unpublished RNAV routes are direct routes, based on area navigation capability, between waypoints defined in terms of latitude/longitude coordinates, degree.distance fixes, or offsets from established routes/airways at a specified distance and direction. Radar monitoring by ATC is required on all unpublished RNAV routes.
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