---
title: "GM1 to AMC1 ATCO.B.020(a) Unit endorsements — ANNEX I – PART ATCO – REQUIREMENTS FOR THE LICENSING OF AIR TRAFFIC CONTROLLERS, ATCO · Avioverse"
description: "There might be cases where, for a given aerodrome, air traffic control service is provided from a ‘conventional tower’ (defined in EASA ‘Guidance…"
url: "https://avioverse.aero/regulations/easa/atco/part-atco-requirements-for-the-licensing-of-air/subpart-b/gm1-to-amc1-atco-b-020-a-unit-endorsements"
---

# GM1 to AMC1 ATCO.B.020(a) Unit endorsements

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

GM Guidance material

## GM1 to AMC1 ATCO.B.020(a) Unit endorsements

There might be cases where, for a given aerodrome, [air traffic control service](https://avioverse.aero/glossary/easa/air-traffic-control-service) is provided from a ‘conventional tower’ (defined in EASA ‘Guidance Material on remote aerodrome air traffic services’ — Issue 2) during certain time periods and from a ‘remote tower’ (defined in the EASA ‘Guidance Material on remote aerodrome air traffic services’ — Issue 2) at other times. In such cases, the [unit endorsement](https://avioverse.aero/glossary/easa/unit-endorsement)(s) should indicate the working position(s) (conventional and/or remote tower) from which the [licence](https://avioverse.aero/glossary/easa/licence) holder is authorised to provide the service.

NOTE: This does not refer to contingency arrangements/contingency facilities, as the related training and use are deemed to be covered by any unit endorsement. When this is done on a temporary basis for shorter/limited time periods, e.g. during a [validation](https://avioverse.aero/glossary/easa/validation) or for transitional purposes, different unit endorsements for conventional and remote tower may not be considered necessary.

GM — Regulation (EU) 2015/340 · ED Decision 2019/004/R · ATCO Easy Access Rules · EAR revision 14 Jun 2024

[All rules in SUBPART B – LICENCES, RATINGS AND ENDORSEMENTS](https://avioverse.aero/regulations/easa/atco/part-atco-requirements-for-the-licensing-of-air/subpart-b)

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.