---
title: "ATCO.D.050 Prerequisites of unit training — ANNEX I – PART ATCO – REQUIREMENTS FOR THE LICENSING OF AIR TRAFFIC CONTROLLERS, ATCO · Avioverse"
description: "Unit training may only be started by persons who are holders of:"
url: "https://avioverse.aero/regulations/easa/atco/part-atco-requirements-for-the-licensing-of-air/subpart-d/atco-d-050"
---

# ATCO.D.050 Prerequisites of unit training

ANNEX I – PART ATCO – REQUIREMENTS FOR THE LICENSING OF AIR TRAFFIC CONTROLLERS · Regulation (EU) 2015/340 · EAR revision 14 Jun 2024

IR Implementing rule

## ATCO.D.050 Prerequisites of unit training

Unit training may only be started by persons who are holders of:

(a) a student air traffic controller [licence](https://avioverse.aero/glossary/easa/licence) with the appropriate [rating](https://avioverse.aero/glossary/easa/rating) and, if applicable, [rating endorsement](https://avioverse.aero/glossary/easa/rating-endorsement); or

(b) an air traffic controller licence with the appropriate rating and, if applicable, rating endorsement;

provided that the requirements set out in ATCO.B.001(d) and ATCO.B.010(b) are met.

\[applicable until 3 August 2024 - Regulation (EU) 2015/340]

Provided that the requirements set out in points ATCO.B.001(d), ATCO.B.005(e) and ATCO.B.010(b) are met:

(a) unit training may only be started by persons who have successfully completed initial training relevant to the rating and, if applicable, rating endorsement;

(b) the on-the-job training phase of unit training may only be started by persons who are holders of a student air traffic controller licence or an air traffic controller licence with the appropriate rating and, if applicable, rating endorsement.

\[applicable from 4 August 2024 - Implementing Regulation (EU) 2023/893]

IR · ATCO.D.050 — Regulation (EU) 2015/340 · Regulation (EU) 2023/893 · ATCO Easy Access Rules · EAR revision 14 Jun 2024

[All rules in SUBPART D – AIR TRAFFIC CONTROLLER TRAINING](https://avioverse.aero/regulations/easa/atco/part-atco-requirements-for-the-licensing-of-air/subpart-d)

Consolidated from the EASA Easy Access Rules (revision 14 Jun 2024, 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.