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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 services 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; 

d. Z—for RNP 1 routes at and below FL 190 to indicate that all turns on the route between 30° and 90° should be made within the tolerance of a tangential arc between the straight leg segments defined with a radius of 15 NM. 

Note: RNAV Q-routes require en route RNAV 2, corresponding NAV/E2 code and PBN/C1-C4 based on navigation system update source. 

## Use of Designators in Communications 

In voice communications, the basic letter of a designator should be spoken in accordance with the International Civil Aviation Organization (ICAO) spelling alphabet. Where the prefixes K, U, or S, previously mentioned, are used in voice communications, they should be pronounced as: 

K—Kopter U—Upper, as in the English language S—Supersonic 

Where suffixes F, G, Y or Z specified in above, are used, the flight crew should not be required to use them in voice communications. Below is an example of how the letters and numbers are spoken. 

A11—Alpha Eleven UR5—Upper Romeo Five KB34—Kopter Bravo Thirty Four UW456—Upper Whiskey Four Fifty Six 

<img src='content_image/531961.jpg'>

