FLIGHT TRAINING PUBLICATION (FLIP) STUDENT GUIDE
The High Altitude Charts portray the Jet Route Structure (18,000 feet MSL to FL 450), which is
included in the Class A airspace; therefore, all MINIMUM ENROUTE ALTITUDES (MEA)
are 18,000 feet, unless otherwise indicated. The MEA assures obstruction clearance and
adequate NAVAID reception over the entire route segment - A MAXIMUM AUTHORIZED
ALTITUDE (MAA) is indicated when other than FL450. MAA assures adequate NAVAID
reception for the entire route segment.
Jet Routes, unlike Low Altitude Airways (Victor Airways), have no defined width.
Their centerlines generally terminate at the outer edges of the NAVAID compass roses. If the
centerline continues unbroken through the compass rose, then that NAVAID is not a part of the
Jet Route; therefore, it is not indicated on the route of flight section of your Flight Plan (DD 175).
Occasionally, in a congested or high-density region, a Jet Route may be plotted inside a compass
rose or the compass rose may be deleted entirely. In both cases, the defining NAVAID radial
will be clearly shown between the NAVAID symbol and the end of the Jet Route line.
Sometimes a semicircle indicates a Jet Route bypasses a facility which is not part of that specific
Many times the path of two or more jet routes will coincide on the chart with the "J" being
printed only once. You should use the route which extends the longest distance along your
planned route of flight.
Jet Route Segments should be flown using navigation signals from the closest NAVAID
along that segment; that is, you should change TACAN channels halfway between NAVAIDs.
There are two exceptions to this rule when flying on a published Jet Route.
1. You should change TACAN channels at a named fix or mileage breakdown symbol, which
denotes a turn in the jet route or;
2. You should change TACAN channels at a specified NAVAID changeover point
indicated by a (Symbol for changeover) on the chart. The latter will only be used when the
intended changeover point is 5 NM or more in either direction from the mid-point of the
NAVAIDs. This usually results when the maximum anticipated reception range of a station is
lower than normal due to high terrain or obstructions.
All TACAN stations on this chart are Class High (H), unless otherwise indicated (i.e., L),
and have an anticipated interference free reception range of at least 130 NM between 18,000 feet
MSL and FL 450. (The reception range of other stations can be found by referring to the Radio
Class Code Table in the legend of the IFR Enroute Supplement). The normal maximum distance
for direct filing is 260 NM.
Low (L) and Terminal (T) radio NAVAIDs minimum guaranteed
range is 40 NM and 25 NM, respectively.
ENROUTE HIGH ALTITUDE CHART