Federal Aviation Administration Twentieth Edition
ENR 3.4 [RESERVED]

Federal Aviation Administration Twentieth Edition
ENR 3.5 Other Routes

1. Airways and Route Systems
1.1
Three fixed route systems are established for air navigation purposes. They are the Federal airway system (consisting of VOR and L/MF routes), the jet route system, and the RNAV route system. To the extent possible, these route systems are aligned in an overlying manner to facilitate transition between each.

2.
VOR and L/MF System

2.1 The VOR and L/MF (nondirectional radio beacons) Airway System consists of airways designated from 1,200 feet above the surface (or in some instances higher) up to but not including 18,000 feet MSL. These airways are depicted on IFR Enroute Low Altitude Charts.
NOTE.
The altitude limits of a victor airway should not be exceeded except to effect transition within or between route structures.
2.2 Except in Alaska, the VOR airways are: predicated solely on VOR or VORTAC navigation aids; depicted in black on aeronautical charts; and identified by a “V” (Victor) followed by the airway number (for example, V12).
NOTE.
Segments of VOR airways in Alaska are based on L/MF navigation aids and charted in brown instead of black on en route charts.
2.3 A segment of an airway which is common to two or more routes carries the numbers of all the airways which coincide for that segment. When such is the case, pilots filing a flight plan need to indicate only that airway number for the route filed.
NOTE.
A pilot who intends to make an airway flight, using VOR facilities, will simply specify the appropriate “victor” airway(s) in the flight plan. For example, if a flight is to be made from Chicago to New Orleans at 8,000 feet, using omniranges only, the route may be indicated as “departing from Chicago.Midway, cruising 8,000 feet via Victor 9 to Moisant International.” If flight is to be conducted in part by means of L/MF navigation aids and in part on omniranges, specifications of the appropriate airways in the flight plan will indicate which types of facilities will be used along the described routes, and, for IFR flight, permit ATC to issue a traffic clearance accordingly. A route may also be described by specifying the station over which the flight will pass but in this case since many VORs and L/MF aids have the same name, the pilot must be careful to indicate which aid will be used at a particular location. This will be indicated in the route of flight portion of the flight plan by specifying the type of facility to be used after the location name in the following manner: Newark L/MF, Allentown VOR.
2.4 With respect to position reporting, reporting points are designed for VOR Airway Systems. Flights using Victor airways will report over these points unless advised otherwise by ATC.
2.5 The L/MF airways (colored airways) are predicated solely on L/MF navigation aids and are depicted in brown on aeronautical charts and are identified by color name and number; e.g., Amber One. Green and Red airways are plotted east and west. Amber and Blue airways are plotted north and south.
NOTE.
Except for G13 in North Carolina, the colored airway system exists only in the state of Alaska. All other such airways formerly so designated in the conterminous U.S. have been rescinded.
CAUTION. Use of adjacently located LF/VHF airways and routes . many locations just outside the contiguous 48 states have two separate airway structures. One structure is made up from VORs and the other from L/MF NAVAIDs (nondirectional radio beacons). In some instances, the different routes appear to overlie each other. The NAVAIDs are sometimes depicted so close to each other that they will have the appearance of being collocated, or nearly so. Substituting a VOR radial for a nondirectional radio beacon bearing could, in many circumstances, cause an excessive “off course” navigational error. Strict adherence to the color coding of the route structure and NAVAID in use should be maintained. Chart procedures provide an excellent means of route differentiation through the use of color which is defined and explained in the legend.
2.6 The use of TSO.C145a or TSO.C146a GPS/WAAS navigation systems is allowed in Alaska as the only means of navigation on published air traffic routes including those Victor and colored airway segments designated with a second minimum en route altitude (MEA) depicted in blue and followed by the letter G at those lower altitudes. The

Federal Aviation Administration Twentieth Edition
altitudes so depicted are below the minimum reception altitude (MRA) of the land.based navigation facility defining the route segment, and guarantee standard en route obstacle clearance and two.way communications. Air carrier operators requiring operations specifications are authorized to conduct operations on those routes in accordance with FAA operations specifications.
　
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