ENR 3.1 Lower ATS Routes

See also ENR 1.10, ENR 1.17, ENR 3.3, ENR 3.5, and Appendix 1.

  1. Low Altitude ATS Route Structure
    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. Route designators and significant points defining the routes are listed in FAA Order JO 7400.11, Airspace Designations and Reporting Points.
      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.
      3. The low altitude routes are designated as Class E airspace.