---
title: "145.A.20 Terms of approval and scope of work — Part-145 · Avioverse"
description: "The organisation’s scope of work shall be specified in the maintenance organisation exposition (MOE) in accordance with point 145.A.70."
url: "https://avioverse.aero/regulations/easa/continuing-airworthiness/part-145/section-a-technical-and-organisation-requirements/145-a-20"
---

# 145.A.20 Terms of approval and scope of work

Annex II (Part-145) · Regulation (EU) No 1321/2014 · EAR revision 2 Sep 2025

IR Implementing rule

## 145.A.20 Terms of approval and scope of work

(a) The [organisation](https://avioverse.aero/glossary/easa/organisation)’s scope of work shall be specified in the [maintenance](https://avioverse.aero/glossary/easa/maintenance) organisation exposition (MOE) in accordance with point 145.A.70.

(b) The organisation shall comply with the terms of approval attached to the organisation certificate issued by the competent authority, and with the scope of work specified in the MOE.

IR · 145.A.20 — Regulation (EU) No 1321/2014 · Regulation (EU) 2021/1963 · Continuing Airworthiness Easy Access Rules · EAR revision 2 Sep 2025

AMC Acceptable means of compliance

## AMC1 145.A.20 Terms of approval and scope of work

The following table identifies the ATA Specification 2200 chapter for the category C [component](https://avioverse.aero/glossary/easa/component) rating. If the [maintenance](https://avioverse.aero/glossary/easa/maintenance) manual (or equivalent document) does not follow the ATA chapters, the corresponding subjects still apply to the applicable C rating.

\<table>

\<tr>

\<td>CLASS\</td>

\<td>RATING\</td>

\<td>ATA CHAPTERS\</td>

\</tr>

\<tr>

\<td rowspan="23">COMPONENTS OTHER THAN COMPLETE ENGINES OR APUs\</td>

\<td>C1 Air Cond \&amp; Press\</td>

\<td>21\</td>

\</tr>

\<tr>

\<td>C2 Auto Flight\</td>

\<td>22\</td>

\</tr>

\<tr>

\<td>C3 Comms and Nav\</td>

\<td>23 – 34\</td>

\</tr>

\<tr>

\<td>C4 Doors — Hatches\</td>

\<td>52\</td>

\</tr>

\<tr>

\<td>C5 Electrical Power \&amp; Lights\</td>

\<td>24 – 33 – 85\</td>

\</tr>

\<tr>

\<td>C6 Equipment\</td>

\<td>25 – 38 – 44 – 45 – 50\</td>

\</tr>

\<tr>

\<td>C7 Engine – APU\</td>

\<td>49 – 71 – 72 – 73 – 74 – 75 – 76 – 77 – 78 – 79 – 80 – 81 – 82 – 83\</td>

\</tr>

\<tr>

\<td>C8 Flight Controls\</td>

\<td>27 – 55 – 57.40 – 57.50 –57.60 – 57.70\</td>

\</tr>

\<tr>

\<td>C9 Fuel\</td>

\<td>28 – 47\</td>

\</tr>

\<tr>

\<td>C10 [Rotorcraft](https://avioverse.aero/glossary/easa/rotorcraft) — Rotors\</td>

\<td>62 – 64 – 66 – 67\</td>

\</tr>

\<tr>

\<td>C11 Rotorcraft — Trans\</td>

\<td>63 – 65\</td>

\</tr>

\<tr>

\<td>C12 Hydraulic Power\</td>

\<td>29\</td>

\</tr>

\<tr>

\<td>C13 Indicating/Recording Systems\</td>

\<td>31 – 42 – 46\</td>

\</tr>

\<tr>

\<td>C14 Landing Gear\</td>

\<td>32\</td>

\</tr>

\<tr>

\<td>C15 Oxygen\</td>

\<td>35\</td>

\</tr>

\<tr>

\<td>C16 Propellers\</td>

\<td>61\</td>

\</tr>

\<tr>

\<td>C17 Pneumatic \&amp; Vacuum\</td>

\<td>36 – 37\</td>

\</tr>

\<tr>

\<td>C18 Protection ice/rain/fire\</td>

\<td>26 – 30\</td>

\</tr>

\<tr>

\<td>C19 Windows\</td>

\<td>56\</td>

\</tr>

\<tr>

\<td>C20 Structural\</td>

\<td>53 – 54 – 57.10 – 57.20 – 57.30\</td>

\</tr>

\<tr>

\<td>C21 Water Ballast\</td>

\<td>41\</td>

\</tr>

\<tr>

\<td>C22 Propulsion Augmentation\</td>

\<td>84\</td>

\</tr>

\<tr>

\<td>C23 Others\</td>

\<td>\</td>

\</tr>

\</table>

The rating for an [organisation](https://avioverse.aero/glossary/easa/organisation) approved for the maintenance of an electric engine that powers a propeller/rotor to generate thrust and/or lift for the [aircraft](https://avioverse.aero/glossary/easa/aircraft) should be B4, rather than C5.

C23 should be used as component rating when C1 to C22 or the corresponding ATA chapters are not adequate for the component; for instance, in case of innovative aircraft architectures/systems.

AMC · AMC1 145.A.20 — Regulation (EU) No 1321/2014 · Continuing Airworthiness Easy Access Rules · EAR revision 2 Sep 2025

AMC Acceptable means of compliance

## AMC2 145.A.20 Terms of approval and scope of work

Facilities such as stores, line stations, [component](https://avioverse.aero/glossary/easa/component) or subcontractors workshops that are not located together with the main facilities of the [organisation](https://avioverse.aero/glossary/easa/organisation) may be covered by the organisation approval without being identified on the organisation certificate, provided that the MOE identifies these facilities and contains procedures to control such facilities, and the competent authority is satisfied that they form an integral part of the approved [maintenance](https://avioverse.aero/glossary/easa/maintenance) organisation.

AMC · AMC2 145.A.20 — Regulation (EU) No 1321/2014 · ED Decision 2022/011/R · Continuing Airworthiness Easy Access Rules · EAR revision 2 Sep 2025

[All rules in SECTION A — TECHNICAL AND ORGANISATION REQUIREMENTS](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-145/section-a-technical-and-organisation-requirements)

Consolidated from the EASA Easy Access Rules (revision 2 Sep 2025, 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.