---
title: "ATS.TR.135 Minimum cruising level for IFR flights — SPECIFIC REQUIREMENTS FOR PROVIDERS OF AIR TRAFFIC SERVICES, ATM/ANS · Avioverse"
description: "Air traffic control units shall not assign cruising levels below the minimum flight altitudes established by the Member States, except when specifically…"
url: "https://avioverse.aero/regulations/easa/atm-ans/part-ats/subpart-b/ats-tr-135"
---

# ATS.TR.135 Minimum cruising level for IFR flights

SPECIFIC REQUIREMENTS FOR PROVIDERS OF AIR TRAFFIC SERVICES · Regulation (EU) 2017/373 · EAR revision 12 Mar 2025

Official sources: [EASA Easy Access Rules (opens in a new tab)](https://www.easa.europa.eu/en/document-library/easy-access-rules/easy-access-rules-air-traffic-managementair-navigation-services-provision-services) · [EUR-Lex 2017/373 (opens in a new tab)](https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32017R0373)

IR Implementing rule

## ATS.TR.135 Minimum cruising level for IFR flights

(a) Air traffic control units shall not assign cruising levels below the minimum flight altitudes established by the Member States, except when specifically authorised by the competent authority.

(b) Air traffic control units shall:

(1) determine the lowest usable flight level or levels for the whole or parts of the control area for which they are responsible;

(2) assign flight levels at or above such level or levels;

(3) pass the lowest usable flight level or levels on to pilots on request.

IR · ATS.TR.135 — Regulation (EU) 2017/373 · Commission Implementing Regulation (EU) 2020/469 · ATM/ANS Easy Access Rules · EAR revision 12 Mar 2025

GM Guidance material

## GM1 ATS.TR.135(b) Minimum cruising level for IFR flights

The lowest usable flight level is that flight level which corresponds to, or is immediately above, the established minimum flight altitude.

GM · GM1 ATS.TR.135(b) — 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 AIR TRAFFIC SERVICES (ATS.TR)](https://avioverse.aero/regulations/easa/atm-ans/part-ats/subpart-b)

Consolidated from the EASA Easy Access Rules (revision 12 Mar 2025, extracted 2 Nov 2026) for convenience. Not the official publication — verify against the Official Journal of the European Union and the EASA publications before operational use.