---
title: "Appendix I Basic training course duration — Part-147 · Avioverse"
description: "The minimum duration of a complete basic training course shall be as follows:"
url: "https://avioverse.aero/regulations/easa/continuing-airworthiness/part-147/appendices-to-annex-iv-part-147/appendix-i"
---

# Appendix I Basic training course duration

Annex IV (Part-147) · Regulation (EU) No 1321/2014 · EAR revision 2 Sep 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-continuing-airworthiness) · [EUR-Lex 2014/1321 (opens in a new tab)](https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=CELEX:32014R1321)

Appendix Appendix

## Appendix I Basic training course duration

The minimum duration of a complete basic training course shall be as follows:

| Basic Course | Duration (in hours) | Theoretical Training Ratio (in %) |
| ------------ | ------------------- | --------------------------------- |
| A1           | 800                 | 30–35                             |
| A2           | 650                 | 30–35                             |
| A3           | 800                 | 30–35                             |
| A4           | 800                 | 30–35                             |
| B1.1         | 2 400               | 50–60                             |
| B1.2         | 2 000               | 50–60                             |
| B1.E         | 2 000               | 50–60                             |
| B1.3         | 2 400               | 50–60                             |
| B1.4         | 2 400               | 50–60                             |
| B2           | 2 400               | 50–60                             |
| B2L          | 1 500 (\*)          | 50–60                             |
| B3           | 1 000               | 50–60                             |

(\*) This number of hours shall be increased as follows, depending on the additional system ratings selected:

| System Rating    | Duration (in hours) | Theoretical Training Ratio (in %) |
| ---------------- | ------------------- | --------------------------------- |
| COM/NAV          | 90                  | 50–60                             |
| INSTRUMENTS      | 55                  |                                   |
| AUTOFLIGHT       | 80                  |                                   |
| SURVEILLANCE     | 40                  |                                   |
| AIRFRAME SYSTEMS | 100                 |                                   |

APPENDIX · Appendix I — Regulation (EU) No 1321/2014 · Regulation (EU) 2018/1142 · Continuing Airworthiness Easy Access Rules · EAR revision 2 Sep 2025

[All rules in APPENDICES TO ANNEX IV (Part-147)](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-147/appendices-to-annex-iv-part-147)

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