---
title: "SERA.14025 Principles governing the identification of ATS routes other than standard departure and arrival routes — ANNEX: Rules of the Air, SERA · Avioverse"
description: "Use of ATS route designators in communications (1) In voice communications, the basic letter of a designator shall be spoken in accordance with the…"
url: "https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-14/sera-14025"
---

# SERA.14025 Principles governing the identification of ATS routes other than standard departure and arrival routes

ANNEX: Rules of the Air · Regulation (EU) No 923/2012 · EAR revision 26 Aug 2025

IR Implementing rule

## SERA.14025 Principles governing the identification of ATS routes other than standard departure and arrival routes

(a) Use of [ATS route](https://avioverse.aero/glossary/easa/ats-route) designators in communications

(1) In voice communications, the basic letter of a designator shall be spoken in accordance with the spelling alphabet as defined in Table S14-2.

(2) Where the prefixes K, U or S are used, they shall, in voice communications, be spoken as follows:

(i) K — KOPTER

(ii) U — UPPER

(iii) S — SUPERSONIC

(b) The word ‘kopter’ shall be pronounced as in the word ‘helicopter’ and the words ‘upper’ and ‘supersonic’ as in the English language.

IR · SERA.14025 — Regulation (EU) No 923/2012 · Regulation (EU) 2016/1185 · SERA Easy Access Rules · EAR revision 26 Aug 2025

AMC Acceptable means of compliance

## AMC1 SERA.14025 Principles governing the identification of ATS routes other than standard departure and arrival routes

LETTERS ‘F’ AND ‘G’

Where letters ‘F’ or ‘G’ are added after the basic designator of the [ATS route](https://avioverse.aero/glossary/easa/ats-route) in question, in order to indicate the type of service provided:

(a) letter ‘F’ indicates that on the route or portion thereof advisory service only is provided; and

(b) letter ‘G’ indicates that on the route or portion thereof [flight information service](https://avioverse.aero/glossary/easa/flight-information-service) only is provided,

(c) the flight crew are not required to use them in voice communications.

AMC · AMC1 SERA.14025 — Regulation (EU) No 923/2012 · ED Decision 2016/023/R · SERA Easy Access Rules · EAR revision 26 Aug 2025

[All rules in SECTION 14 Voice communication procedures](https://avioverse.aero/regulations/easa/sera/annex-rules-of-the-air/section-14)

Consolidated from the EASA Easy Access Rules (revision 26 Aug 2025, extracted 13 Oct 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.