Part-66 Module 10 Syllabus: What Appendix I Requires

What is in Part-66 Module 10 after Regulation (EU) 2023/989?

Module 10, Aviation Legislation, runs to ten sub-modules — 10.1 Regulatory framework through 10.10 Cybersecurity in aviation maintenance — since Regulation (EU) 2023/989 replaced Appendix I to Part-66 with effect from 12 June 2024. The module grew from seven headings to ten, three of them entirely new, and the examination lost its essay question in every category. This guide walks the current syllabus topic by topic, then the examination rules. For the history of what changed and why, see our companion guide on Module 10 after 2023/989; this one is about what a candidate studies today. Module 9 is walked the same way in our Part-66 Module 9 syllabus guide. Where Module 10 sits beside a maintenance organisation’s own training duties is covered in our clause-by-clause Part-145 training map.

The module exists to be examined: 66.A.25(a) requires every applicant for an aircraft maintenance licence to demonstrate knowledge of the applicable modules by examination, in accordance with Appendix I. The Appendix I modularisation matrix marks Module 10 with an X in every category column, A1 to A4, B1.1 to B1.4, B3, B2, B2L and C, so aviation legislation sits alongside Module 9 as one of the two subjects every Part-66 candidate studies regardless of category.

Module 10 at a glance

Figure	What it is
10 sub-modules	Module 10’s syllabus size, up from 7 headings, three entirely new — Appendix I to Part-66, as replaced by Regulation (EU) 2023/989
32 questions, 40 minutes	Category A multiple-choice exam format, no essay — Appendix II to Part-66, point 2.10
44 questions, 55 minutes	Category B1, B2, B2L and B3 multiple-choice exam format, no essay — Appendix II to Part-66, point 2.10
75% pass mark	8 wrong answers out of 32 (Category A) or 11 out of 44 (Category B) is the most a pass can absorb — Appendix II to Part-66, point 1.7
90 days	Standard wait to retake a failed module exam; 30 days after Part-147 retraining tailored to the failed subjects — Appendix II to Part-66, point 1.11
12 June 2024	Date the ten-sub-module Module 10 and its multiple-choice-only exam became applicable

What level does each licence category need?

Unlike Module 9, which uses a single level column for every category, Appendix I splits Module 10 into two columns: category A, and category B, which covers B1, B2, B2L and B3 at the same depth.

MODULE 10. AVIATION LEGISLATION — LEVEL: Cat. A / Cat. B 10.1 Regulatory framework — 1/1 10.2 Certifying staff – maintenance — 2/2 10.3 Approved maintenance organisations — 2/2 10.4 Independent certifying staff — —/3 10.5 Air operations — 1/1 10.6 Certification of aircraft, parts, and appliances — 2/2 10.7 Continuing airworthiness — 2/2 10.8 Oversight principles in continuing airworthiness — 1/1 10.9 Maintenance and certification beyond the current EU regulations (if not superseded by EU requirements) — —/1 10.10 Cybersecurity in aviation maintenance — 1/1

— Appendix I to Part-66, Module 10, as replaced by Regulation (EU) 2023/989

Category A and category B are examined to the same level on every heading they share, with two exceptions. 10.4 Independent certifying staff is examined only for category B, at level 3, the deepest requirement anywhere in the module. 10.9 Maintenance and certification beyond the current EU regulations is likewise examined only for category B, at level 1. A category A candidate never sits either heading.

10.1 Regulatory framework (level 1/1). The structure of the rules a licence holder works within: how EASA rulemaking, the Basic Regulation and the implementing rules that make up Part-66, Part-145 and the surrounding Annexes fit together.

10.2 Certifying staff – maintenance (level 2/2). The privileges, limitations and responsibilities of the certifying staff role itself, tied to 66.A.20 and the licence a candidate is working towards.

10.3 Approved maintenance organisations (level 2/2). What it takes for an organisation to hold and keep a Part-145 or Part-CAO approval, and how that approval frames the certifying staff working inside it.

10.4 Independent certifying staff (level —/3, category B only). New with 2023/989. This is the licence holder certifying maintenance outside an approved organisation, a privilege 66.A.20 grants directly rather than through an organisation’s approval — the deepest single requirement in Module 10, and the clearest sign the module now expects more of B-category candidates than before.

10.5 Air operations (level 1/1). How the aircraft operator side of the system, the rules an airline or operator works to, bears on continuing airworthiness and maintenance planning.

10.6 Certification of aircraft, parts, and appliances (level 2/2). The design and production side: type certification, production approvals, and how a part or appliance gets the paperwork that lets it go on an aircraft.

10.7 Continuing airworthiness (level 2/2). The Part-M and Part-CAMO territory: maintenance programmes, airworthiness review, and keeping an aircraft in a condition for safe operation between the certification event and the next one. What that territory asks of each approved organisation’s training is set out in our EASA Part-M training guide.

10.8 Oversight principles in continuing airworthiness (level 1/1). New with 2023/989. This is the competent authority’s side of the system — how a national aviation authority or EASA itself oversees organisations and licence holders — brought into the licence syllabus for the first time.

10.9 Maintenance and certification beyond the current EU regulations (level —/1, category B only). Renumbered from the old 10.7 Applicable national and international requirements heading. It covers maintenance and certification matters not, or not yet, superseded by EU requirements — the parenthetical qualifier is part of the regulation’s own heading.

10.10 Cybersecurity in aviation maintenance (level 1/1). New with 2023/989 and entirely new ground for a basic licence module: the security dimension of the systems and data a maintenance environment now depends on.

The sub-topics under each heading are set out in AMC1 to Appendix I to Part-66 in the EASA Easy Access Rules; the Regulation itself gives only the headings and the levels shown above.

How does the EU syllabus differ from the UK’s?

The two Module 10 syllabi are no longer the same document. Since Regulation (EU) 2023/989, the EU examines ten sub-modules, 10.1 to 10.10, while UK Appendix I still runs 10.1 to 10.7, and the UK’s Appendix II still requires essays for Modules 7A, 7B, 9A, 9B and 10. The UK left the EASA system on 31 December 2020 and did not adopt the 2023 amendment, so its assimilated text preserves the pre-2024 seven-heading structure, ending at what the old syllabus called applicable national and international requirements rather than picking up independent certifying staff, oversight principles, the beyond-EU-regulations heading or cybersecurity. A candidate aiming at a UK CAA licence studies the seven-topic module and sits an essay; a candidate aiming at an EASA licence studies the ten-topic module with a multiple-choice-only paper. Our certificates guide sets out what that divergence means for recognition of training between the two systems.

How is Module 10 examined?

Appendix II fixes the format; a training provider cannot vary it:

“2.10. MODULE 10 – AVIATION LEGISLATION. Category A: 32 multiple-choice, no essay questions. Time allowed: 40 minutes. Category B1, B3, B2 and B2L: 44 multiple-choice, no essay questions. Time allowed: 55 minutes.” — Appendix II to Part-66, point 2.10

The pass mark is 75% under Appendix II point 1.7, so a category A candidate can afford eight wrong answers out of 32 and a category B candidate eleven out of 44. Both papers sit below the 90-minute threshold at which Appendix II point 1.12 allows an examination to be split into partial exams, so Module 10 is always sat in one sitting, for either category. Failing has a waiting cost, the same rule that applies across every basic module:

“An examination in a module may not be retaken earlier than 90 days following the date of a failed examination in that module, except in the case of a maintenance training organisation approved in accordance with Annex IV (Part-147) which delivers a course of retraining tailored to the failed subjects in the particular module; the failed module may be retaken after 30 days.” — Appendix II to Part-66, point 1.11

Related courses. Part-66 Module 10 aviation legislation online course follows the ten post-2023/989 sub-modules one to one, and EASA Part-145 regulatory training online course is the organisational counterpart for staff who need Annex II rather than a licence module.