Phraseology Database

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Reading the syntax:

Words in square parentheses indicate optional additional words or information that may be necessary in specific instances.

Words in parentheses indicate that specific information, such as a level, a place or a time, etc., must be inserted to complete the phrase, or alternatively that optional phrases may be used.

About the content:

The phrases presented in this database are extracted from ICAO Annex 10, Volume 2, and ICAO Doc 4444.

Users should note that regional and local differences of phraseology may exist from those indicated in these ICAO documents. Users should check their local AIPs for potential differences. The ATFM phraseology from ICOA DOC7030 and from ICAO EUR/RAC - 24 are not included in this database.

The phraseologies contained in this database are not intended to be exhaustive, and when circumstances differ, pilots, ATS personnel and other ground personnel will be expected to use plain language, which should be as clear and concise as possible, to the level specified in the ICAO language proficiency requirements contained in Annex 1 — Personnel Licensing, in order to avoid possible confusion by those persons using a language other than one of their national languages.

Phraseologies for the movement of vehicles, other than tow-tractors, on the manoeuvring area shall be the same as those used for the movement of aircraft, with the exception of taxi instructions, in which case the word "PROCEED" shall be substituted for the word "TAXI" when communicating with vehicles.

Conditional phrases, such as "behind landing aircraft" or "after departing aircraft", shall not be used for movements affecting the active runway(s), except when the aircraft or vehicles concerned are seen by the appropriate controller and pilot.

The aircraft or vehicle causing the condition in the clearance issued shall be the first aircraft/vehicle to pass in front of the other aircraft concerned. In all cases a conditional clearance shall be given in the following order and consist of:

  • a) identification;
  • b) the condition;
  • c) the clearance; and
  • d) brief reiteration of the condition.

For example:

Note.— This implies the need for the aircraft receiving the conditional clearance to identify the aircraft or vehicle causing the conditional clearance.


Application version:
2.1 (uploaded July 2020)

Database version:
ICAO 1.02 (updated 16th July 2020)

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