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Which ATS designator is used for a low-level route for helicopters?

COMPOSITION OF DESIGNATOR
The ATS route designator shall consist of a basic designator supplemented, if necessary, by:

(1) One prefix; and
(2) One additional letter.

  • The number of characters required to compose the designator shall not exceed six characters.
  • The number of characters required to compose the designator should, whenever possible, be kept to a maximum of five characters.
  • The basic designator shall consist of one letter of the alphabet followed by a number from 1 to 999.

Selection of the letter shall be made from those listed hereunder:

A, B, G, RRoutes which form part of the regional networks of ATS routes and are not area navigation routes.
L, M, N, PArea navigation routes which form part of the regional networks of ATS routes.
H, J, V, WRoutes which do not form part of the regional networks of ATS routes and are not area navigation routes.
Q, T, Y, ZArea navigation routes which do not form part of the regional networks of ATS routes.

In addition to the basic designator, where applicable, one supplementary letter shall be added as a prefix to the basic designator in accordance with the following:

(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) K to indicate a low-level route by helicopters (in voice communications this is spoken as "KOPTER");
(d) S to indicate a route for use by supersonic aircraft;
(e) U to indicate that the route or portion in the upper airspace.

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