---
title: "ATCO.C.020 Validity of on-the-job training instructor endorsement — ANNEX I – PART ATCO – REQUIREMENTS FOR THE LICENSING OF AIR TRAFFIC CONTROLLERS, ATCO · Avioverse"
description: "The OJTI endorsement shall be valid for a period of three years."
url: "https://avioverse.aero/regulations/easa/atco/part-atco-requirements-for-the-licensing-of-air/subpart-c/atco-c-020"
---

# ATCO.C.020 Validity of on-the-job training instructor endorsement

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.C.020 Validity of on-the-job training instructor endorsement

(a) The OJTI endorsement shall be valid for a period of three years.

(b) The OJTI endorsement may be revalidated by successfully completing refresher training on practical instructional skills during its validity period, provided that the requirements of ATCO.C.015(a) and (b) are met.

(c) If the OJTI endorsement has expired, it may be renewed by:

(1) receiving refresher training on practical instructional skills; and

(2) successfully passing a practical instructor competence [assessment](https://avioverse.aero/glossary/easa/assessment);

within the year preceding the application for [renewal](https://avioverse.aero/glossary/easa/renewal), provided that the requirements of ATCO.C.015(a) and (b) are met.

(d) In the case of first issue and renewal the period of validity of the OJTI endorsement shall start not later than 30 days from the date on which the assessment has been successfully completed.

(e) If the requirements of ATCO.C.015(a) and (b) are not met the OJTI endorsement may be exchanged for an STDI endorsement, provided that compliance with the requirements of ATCO.C.040(b) and (c) is ensured.

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

(a) The OJTI endorsement shall be valid for a period of 3 years.

(b) The OJTI endorsement may be revalidated by successfully completing refresher training on practical instructional skills during its validity, provided that the requirement of point ATCO.C.015(a) is met.

(c) If the OJTI endorsement has expired, provided that the requirement of point ATCO.C.015(a) is met, it may be renewed if, within the 12 months preceding the application for renewal, the OJTI endorsement holder has:

(1) received refresher training on practical instructional skills; and

(2) successfully passed a practical instructor competence assessment.

(d) In the case of first issue and renewal, the period of validity of the OJTI endorsement shall start not later than 30 days from the date on which the assessment has been successfully completed.

(e) If the requirement of point ATCO.C.015(a) is not met, the OJTI endorsement may be exchanged for an STDI endorsement, provided that compliance with the requirements of point ATCO.C.040 (b) and (c) is ensured.

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

IR · ATCO.C.020 — Regulation (EU) 2015/340 · Regulation (EU) 2023/893 · ATCO Easy Access Rules · EAR revision 14 Jun 2024

GM Guidance material

## GM1 ATCO.C.020(b) Validity of on-the-job training instructor endorsement

[REVALIDATION](https://avioverse.aero/glossary/easa/revalidation)

(a) Successful completion of the refresher training in practical instructional skills may be verified by several means, for example by:

(1) dedicated or continuous [assessment](https://avioverse.aero/glossary/easa/assessment);

(2) peer assessment; or

(3) demonstration of the practical instructional skills.

(b) The verification should be undertaken following the completion of the refresher training.

GM · GM1 ATCO.C.020(b) — Regulation (EU) 2015/340 · ED Decision 2015/010/R · ATCO Easy Access Rules · EAR revision 14 Jun 2024

[All rules in SUBPART C – REQUIREMENTS FOR INSTRUCTORS AND ASSESSORS](https://avioverse.aero/regulations/easa/atco/part-atco-requirements-for-the-licensing-of-air/subpart-c)

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.