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AIS.TR.400 Distribution services

SPECIFIC REQUIREMENTS FOR THE PROVIDERS OF AERONAUTICAL INFORMATION SERVICES · Regulation (EU) 2017/373 · EAR revision 12 Mar 2025

IRImplementing rule

AIS.TR.400Distribution services

(a)A predetermined distribution system for NOTAM transmitted on the AFS shall be used whenever possible.

(b)Distribution of NOTAM series other than those distributed internationally shall be granted upon request.

(c)NOTAM shall be prepared in conformity with ICAO communication procedures laid down in ICAO Annex 10, Volume II.

(d)Each NOTAM shall be transmitted as a single telecommunication message.

(e)The exchange of ASHTAM beyond the territory of a Member State, and NOTAM where Member States use NOTAM for distribution of information on volcanic activity, shall include volcanic ash advisory centres and the world area forecast centres, and take account of the requirements of long-range operations.

IR · AIS.TR.400 — Regulation (EU) 2017/373 · Commission Implementing Regulation (EU) 2020/469 · ATM/ANS Easy Access Rules · EAR revision 12 Mar 2025

GMGuidance material

GM1 AIS.TR.400(a)Distribution services

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NOTAM

(a)The predetermined distribution system provides for incoming NOTAM (including SNOWTAM and ASHTAM) to be channelled through the aeronautical fixed service (AFS) directly to designated addressees predetermined by the receiving country concerned while concurrently being routed to the international NOTAM office for checking and control purposes.

(b)The addressee indicators for those designated addressees are constituted as follows:

(1)First and second letters The first two letters of the location indicator for the AFS communication centre associated with the relevant international NOTAM office of the receiving country.

(2)Third and fourth letters The letters ‘ZZ’ indicating a requirement for special distribution.

(3)Fifth letter The fifth letter differentiating between NOTAM (letter ‘N’), SNOWTAM (letter ‘S’), and ASHTAM (letter ‘V’).

(4)Sixth and seventh letters The sixth and seventh letters, each taken from the series A to Z, denoting the national and/or international distribution list(s) to be used by the receiving AFS centre. The fifth, sixth and seventh letters replace the three-letter designator YNY which, in the normal distribution system, denotes an international NOTAM office.

(5)Eighth letter The eighth position letter shall be the filler letter ‘X’ to complete the eight-letter addressee indicator.

(c)Member States are to inform the States from which they receive NOTAM of the sixth and seventh letters to be used under different circumstances to ensure proper routing.

GM · GM1 AIS.TR.400(a) — Regulation (EU) 2017/373 · ED Decision 2020/008/R · ATM/ANS Easy Access Rules · EAR revision 12 Mar 2025

All rules in SUBPART B — TECHNICAL REQUIREMENTS FOR PROVIDERS OF AERONAUTICAL INFORMATION SERVICES (AIS.TR)

Consolidated from the EASA Easy Access Rules (revision 12 Mar 2025, extracted 17 Aug 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.

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