--- title: "Appendix IV Experience and basic knowledge modules or partial modules required for extending an aircraft maintenance licence under Annex III (Part-66) — Part-66 · Avioverse" description: "Experience requirements Table A below shows the experience requirements, in months, for adding a new category or subcategory to a licence granted in…" url: "https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/appendix-iv" --- # Appendix IV Experience and basic knowledge modules or partial modules required for extending an aircraft maintenance licence under Annex III (Part-66) Annex III (Part-66) · Regulation (EU) No 1321/2014 · EAR revision 2 Sep 2025 Appendix Appendix ## Appendix IV Experience and basic knowledge modules or partial modules required for extending an aircraft maintenance licence under Annex III (Part-66) A. Experience requirements Table A below shows the experience requirements, in months, for adding a new category or subcategory to a licence granted in accordance with Annex III (Part-66). The experience requirements can be reduced by 50 % if the applicant has completed an approved Part-147 basic training course relevant to a particular subcategory. Table A | To: From: | A1 | A2 | A3 | A4 | B1.1 | B1.2 | B1.3 | B1.4 | B2 | B2L | B3 | L1 | L2 | L3 | L4 | L5 | | --------- | -- | -- | -- | -- | ---- | ---- | ---- | ---- | -- | --- | -- | ----- | ----- | ----- | ----- | ----- | | A1 | — | 6 | 6 | 6 | 24 | 6 | 24 | 12 | 24 | 12 | 6 | 12 | 12 | 12 | 12 | 24 | | A2 | 6 | — | 6 | 6 | 24 | 6 | 24 | 12 | 24 | 12 | 6 | 12 | 12 | 12 | 12 | 24 | | A3 | 6 | 6 | — | 6 | 24 | 12 | 24 | 6 | 24 | 12 | 12 | 12 | 12 | 12 | 12 | 24 | | A4 | 6 | 6 | 6 | — | 24 | 12 | 24 | 6 | 24 | 12 | 12 | 12 | 12 | 12 | 12 | 24 | | B1.1 | — | 6 | 6 | 6 | — | 6 | 6 | 6 | 12 | 12 | 6 | 6 | 6 | 12 | 12 | 12 | | B1.2 | 6 | — | 6 | 6 | 24 | — | 24 | 6 | 24 | 12 | — | — | — | 12 | 12 | 12 | | B1.3 | 6 | 6 | — | 6 | 6 | 6 | — | 6 | 12 | 12 | 6 | 6 | 6 | 12 | 12 | 12 | | B1.4 | 6 | 6 | 6 | — | 24 | 6 | 24 | — | 24 | 12 | 6 | 6 | 6 | 12 | 12 | 12 | | B2 | 6 | 6 | 6 | 6 | 12 | 12 | 12 | 12 | — | — | 12 | 6 | 6 | 12 | 12 | 24 | | B2L | 6 | 6 | 6 | 6 | 12 | 12 | 12 | 12 | 12 | — | 12 | 6 | 6 | 12 | 12 | 24 | | B3 | 6 | — | 6 | 6 | 24 | 6 | 24 | 12 | 24 | 12 | — | — | — | 12 | 12 | 12 | | L1 | 24 | 24 | 24 | 24 | 36 | 24 | 36 | 24 | 36 | 24 | 24 | — | 6 \* | 12 \* | 12 \* | 24 \* | | L2 | 24 | 12 | 24 | 24 | 36 | 12 | 36 | 24 | 36 | 24 | 12 | — | — | 12 \* | 12 \* | 24 \* | | L3 | 30 | 30 | 30 | 30 | 48 | 30 | 48 | 30 | 48 | 30 | 30 | 12 \* | 12 \* | — | 6 \* | 24 \* | | L4 | 30 | 30 | 30 | 30 | 48 | 30 | 48 | 30 | 48 | 30 | 30 | 12 \* | 12 \* | — | — | 24 \* | | L5 | 24 | 24 | 24 | 24 | 36 | 24 | 36 | 24 | 36 | 24 | 24 | 12 \* | 12 \* | 12 \* | — | — | B. Basic knowledge modules or partial modules required The purpose of this table is to outline the examinations required to add a new basic category/subcategory to an AML granted in accordance with this Annex. The syllabi prepared in accordance with Appendix I and Appendix VII require different levels of knowledge for different licence categories within a module; therefore, there are additional examinations applicable to certain modules for licence holders wishing to extend an AML granted in accordance with this Annex to include another category/subcategory and an analysis of the module shall be conducted to determine the subjects missing or passed at a lower level. Table B | To From | A1 | A2 | A3 | A4 | B1.1 | B1.2 | B1.3 | B1.4 | B2 | B2L | B3 | L1C | L1 | L2C | L2 | L3H | L3G | L4H | L4G | L5 | | ------- | ----------------- | ----------------- | ------------- | ------------- | ----------------- | ----------------- | ---------------- | ------------- | -------------------- | ------------------ | ------------------- | -------------- | ---------------------- | ------------------ | -------------------------- | -------------- | -------------- | -------------- | -------------- | --------------------------------------- | | A1 | None | 16. | 12. | 12, 16. | All except 9. | All except 9. | All except 9. | All except 9. | All except 9. | All except 9. | All except 2, 8, 9. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 9. | | A2 | 11, 15. | None | 12, 15. | 12. | All except 9. | All except 9. | All except 9. | All except 9. | All except 9. | All except 9. | All except 2, 8, 9. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 9. | | A3 | 11, 17. | 11, 16, 17. | None | 16. | All except 9. | All except 9. | All except 9. | All except 9. | All except 9. | All except 9. | All except 2, 8, 9. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 9. | | A4 | 11, 15, 17. | 11, 17. | 15. | None | All except 9. | All except 9. | All except 9. | All except 9. | All except 9. | All except 9. | All except 2, 8, 9. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 2L. | All except 9. | | B1.1 | None | 16. | 12. | 12, 16. | None | 16. | 12. | 12, 16. | 4, 5, 13,14 | 4, 5, 13SQ, 14SQ | 16. | 12L. | 12L. | 8L\*\*, 12L. | 8L\*\*, 12L. | 9L. | 10L. | 9L, 11L. | 10L, 11L. | 8L\*\*, 10L,11, 12L. | | B1.2 | 11,15. | None | 12, 15. | 12. | 11, 15. | None | 12, 15. | 12. | 4, 5, 13, 14 | 4, 5, 13SQ. 14SQ | None | 12L. | 12L. | 8L\*, 12L. | 8L\*, 12L. | 9L. | 10L. | 9L, 11L. | 10L, 11L. | 8L\*, 10L,11,12L. | | B1.3 | 11, 17. | 11, 16, 17. | None | 16. | 11, 17. | 11, 16, 17. | None | 16. | 4, 5, 13, 14 | 4, 5, 13SQ. 14SQ | 11, 16, 17. | 7L,12L. | 7L,12L. | 7L, 8L\*\*, 12L. | 7L, 8L\*\*, 12L. | 9L. | 10L. | 9L, 11L. | 10L, 11L. | 8L\*\*, 10L,11, 12L. | | B1.4 | 11, 15, 17. | 11, 17. | 15. | None | 11, 15, 17. | 11, 17. | 15. | None | 4, 5, 13, 14 | 4, 5, 13SQ. 14SQ | 11, 17. | 7L,12L. | 7L,12L. | 7L,8L\*, 12L. | 7L,8L\*, 12L. | 9L. | 10L. | 9L,11L. | 10L, 11L. | 8L\*, 10L, 11, 12L. | | B2 | 6, 7, 11, 15, 17. | 6, 7, 11, 16, 17. | 6, 7, 12, 15. | 6, 7, 12, 16. | 6, 7, 11, 15, 17. | 6, 7, 11, 16, 17. | 6, 7, 12, 15. | 6, 7, 12, 16. | None | None | 6, 7, 11, 16, 17. | 5L, 7L. | 4L, 5L, 6L,7L. | 5L,7L, 8L. | 4L,5L, 6L,7L, 8L. | 9L. | 10L. | 9L, 11L. | 10L, 11L. | 6, 7, 11 or 12, 15 or 16, 17, 8L, 10L | | B2L | 6, 7, 11, 15, 17. | 6, 7, 11, 16, 17. | 6, 7, 12, 15. | 6, 7, 12, 16. | 6, 7, 11, 15, 17. | 6, 7, 11, 16, 17. | 6, 7, 12, 15. | 6, 7, 12, 16. | 13SQ, 14SQ. | None | 6, 7, 11, 16, 17. | 5L, 7L, 12LSQ. | 4L, 5L, 6L, 7L, 12LSQ. | 5L, 7L, 8L, 12LSQ. | 4L, 5L, 6L, 7L, 8L, 12LSQ. | 9L. | 10L. | 9L, 11L. | 10L, 11L. | 6, 7, 11 or 12, 15 or 16, 17, 8L, 10L | | B3 | 11, 15. | 11 | 12, 15. | 12. | 2,3,5, 8, 11, 15. | 2,3,5,8, 11. | 2,3,5,8, 12, 15. | 2,3,5,8, 12. | 2,3,4, 5, 8, 13, 14. | 2,3,4, 5, 8, 13SQ. | None | 12L. | 12L. | 8L\*, 12L. | 8L\*, 12L. | 9L. | 10L. | 9L, 11L. | 10L, 11L. | 2,3,5,8, 11 or 12, 8L\*, 10L, 11L, 12L. | | To From | A1 | A2 | A3 | A4 | B1.1 | B1.2 | B1.3 | B1.4 | B2 | B2L | B3 | L1C | L1 | L2C | L2 | L3H | L3G | L4H | L4G | | ------- | --- | --- | --- | --- | ---- | ---- | ---- | ---- | --- | --- | --- | ------ | ------------- | ---------- | ----------------- | ---- | ---- | ----------- | ------------- | | L1C | All | All | All | All | All | All | All | All | All | All | All | None | 4L, 6L. | 8L. | 4L, 6L, 8L. | 9L. | 10L. | 8L,9L, 11L. | 8L, 10L, 11L. | | L1 | All | All | All | All | All | All | All | All | All | All | All | None | None | 8L. | 8L. | 9L. | 10L. | 8L,9L, 11L. | 8L,10L, 11L. | | L2C | All | All | All | All | All | All | All | All | All | All | All | None | 4L,6L. | None | 4L, 6L. | 9L. | 10L. | 9L,11L. | 10L, 11L. | | L2 | All | All | All | All | All | All | All | All | All | All | All | None | None | None | None | 9L. | 10L. | 9L,11L. | 10L, 11L. | | L3H | All | All | All | All | All | All | All | All | All | All | All | 5L,7L. | 4L,5L, 6L,7L. | 5L,7L, 8L. | 4L,5L, 6L,7L, 8L. | None | 10L. | 8L,11L. | 8L,10L, 11L. | | L3G | All | All | All | All | All | All | All | All | All | All | All | 5L,7L. | 4L,5L, 6L,7L. | 5L,7L, 8L. | 4L,5L, 6L,7L, 8L. | 9L. | None | 8L,9L, 11L. | 8L,11L. | | L4H | All | All | All | All | All | All | All | All | All | All | All | 5L,7L. | 4L,5L, 6L,7L. | 5L,7L. | 4L,5L, 6L,7L. | None | 10L. | None | 10L. | | L4G | All | All | All | All | All | All | All | All | All | All | All | 5L,7L. | 4L,5L, 6L,7L. | 5L,7L. | 4L,5L, 6L,7L. | 9L. | None | 9L. | None | SQ = it depends on system qualification \*: excluding the subjects related to piston engines \*\*: excluding the subjects related to turbine engines; APPENDIX · Appendix IV — Regulation (EU) No 1321/2014 · Regulation (EU) 2023/989 · Continuing Airworthiness Easy Access Rules · EAR revision 2 Sep 2025 [All rules in APPENDICES TO ANNEX III (Part-66)](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66) 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.