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conventional routes are being designated for RNAV
use. It is important to be alert to the rapidly changing
application of RNAV techniques being applied to conventional en route airways. Published RNAV routes may
potentially be found on any NACO en route chart. The
published RNAV route designation may be obvious, or,
on the other hand, RNAV route designations may be
less obvious, as in the case where a published route
shares a common flight track with a conventional airway. Note: Since the use of RNAV is dynamic and
rapidly changing, NACO en route charts are continuously being updated for information changes and you
may find some differences between charts.
According to the International Civil Aviation
Organization (ICAO), who develops standard principles and techniques for international air navigation,
basic designators for air traffic service (ATS) routes
and their use in voice communications have been established in Annex 11. ATS is a generic ICAO term for
flight information service, alerting service, air traffic
advisory service, and air traffic control service. One of
the main purposes of a system of route designators is to
allow both pilots and ATC to make unambiguous reference to RNAV airways and routes. Many countries have
adopted ICAO recommendations with regard to ATS
route designations. Basic designators for ATS routes
consist of a maximum of five, and in no case exceed
six, alpha/numeric characters in order to be usable by
both ground and airborne automation systems. The designator indicates the type of the route such as high/low
altitude, specific airborne navigation equipment
requirements such as RNAV, and the aircraft type using
the route primarily and exclusively. The basic route
designator consists of one or two letter(s) followed by a
number from 1 to 999.
COMPOSITION OF DESIGNATORS
The prefix letters that pertain specifically to RNAV designations are included in the following list:
1. The basic designator consists of one letter of the
alphabet followed by a number from 1 to 999.
The letters may be:
a) A, B, G, R — for routes that form part of
the regional networks of ATS routes and are
not RNAV routes;
b) L, M, N, P — for RNAV routes that form
part of the regional networks of ATS routes;
c) H, J, V, W — for routes that do not form
part of the regional networks of ATS routes
and are not RNAV routes;
d) Q, T, Y, Z — for RNAV routes that do not
form part of the regional networks of ATS
routes.
2. Where applicable, one supplementary letter must
be added as a prefix to the basic designator as
follows:
a) K — to indicate a low level route established for use primarily by helicopters.
b) U — to indicate that the route or portion
thereof is established in the upper airspace;
c) S — to indicate a route established exclusively for use by supersonic airplanes
during acceleration/deceleration and
while in supersonic flight.
3. Where applicable, a supplementary letter may be
added after the basic designator of the ATS route
as a suffix as follows:
a) F — to indicate that on the route or portion
thereof advisory service only is provided;
b) G — to indicate that on the route or portion
thereof flight information service only is
provided;
c) Y — for RNP 1 routes at and above FL 200
to indicate that all turns on the route
between 30° and 90° must be made within
the tolerance of a tangential arc between the
straight leg segments defined with a radius
of 22.5 NM.
3-32
d) Z — for RNP 1 routes at and below FL 190
to indicate that all turns on the route
between 30° and 90° shall be made within
the tolerance of a tangential arc between the
straight leg segments defined with a radius
of 15 NM.
USE OF DESIGNATORS IN COMMUNICATIONS
In voice communications, the basic letter of a designator should be spoken in accordance with the ICAO
spelling alphabet. Where the prefixes K, U or S, specified in 2., above, are used in voice communications,
they should be pronounced as:
K = “Kopter” U = “Upper” S = “Supersonic”
as in the English language.
Where suffixes “F”, “G”, “Y” or “Z” specified in 3.,
above, are used, the flight crew should not be required
to use them in voice communications.
Example:
A11 will be spoken Alfa Eleven
UR5 will be spoken Upper Romeo Five
KB34 will be spoken Kopter Bravo Thirty Four
UW456 F will be spoken Upper Whiskey Four Fifty Six
Figure 3-36 depicts published RNAV routes in the
　
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