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New ICAO publication (Doc 8585)

Doc 8585, Designators for Aircraft Operating Agencies, Aeronautical Authorities and Services. Edition No. 200, April 2022.

This document contains designators for aircraft operating agencies and for authorities and services associated with international aviation. The designators currently consist of: a) three-letter designators intended for use on the international aeronautical telecommunications service; b) telephony designators for aircraft operating agencies and for authorities and services operating aircraft, which may be used as appropriate.

In accordance with a decision of the ICAO Council, three-letter designators are being applied for all current purposes with effect from 25 October 1987. This document contains details of the three-letter designators which have been reserved for use by aircraft operating agencies, aeronautical authorities and services at the time of publication.

Three-letter designators may be used following the Location Indicator as the fifth, sixth and seventh letters of Addressee Indicators followed by the filler letter “X”, or by a letter representing a department or division within the organization addressed, (see Annex 10 — Aeronautical Telecommunications, Volume II, in the Shortened Address, Address, Origin and/or text parts of AFTN messages, (the filler letter need not be repeated in the text part of the message). The three-letter designator may also be used in the aircraft identification as used in the Flight Plan and associated messages (see Procedures for Air Navigation Services — Air Traffic Management (PANS-ATM, Doc 4444)).

For the convenience of message originators, the document also includes the postal and telecommunications addresses (commercial and aeronautical) of government civil aviation authorities.

The designators consist of: a) three-letter designators which are used primarily for messaging purposes on the international aeronautical telecommunication service and for aircraft identification by air traffic control (ATC); and b) telephony designators which form the prefix of the aircraft call sign and the call sign for aeronautical ground stations in radiotelephony communications. Parts 1, 2 and 3 consist of encode and decode tables linking aircraft operating agencies, aeronautical authorities and services with their assigned ICAO three-letter and telephony designators. Addresses of government civil aviation authorities are listed in Part 4.

This edition incorporates designators registered and corrective material received from States up to 04/4/22.


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