Part-66 Module Exam Practice

Part-66 Prep is a practice site for the basic knowledge examinations you pass to get an aircraft maintenance licence (AML) under EASA Part-66 or UK Part-66. If you are working through your modules as an apprentice, studying at night after a shift on the line, or changing career into aircraft maintenance, you can practise here in the same format as the real module exams, for free, and learn why each answer is right.

We are an independent study aid. We are not EASA, the UK Civil Aviation Authority, a national aviation authority or a Part-147 approved maintenance training organisation. We don't book exams and we don't issue certificates of recognition. What we do is help you prepare: exam-style papers sized for your category, a bank of more than 14,000 original three-option questions, and plain-English study notes with sources and check dates.

How Part-66 module exams work

The Part-66 licence is built from modules. The syllabus in Appendix I to Part-66 splits the knowledge into 17 modules, from Module 1 mathematics to Module 17 propellers, and each licence category needs its own set. You sit one examination per module (some modules are split by category, such as 11A, 11B and 11C), and you can take them in any order, with a Part-147 organisation or, in the UK, at a CAA exam venue.

Every module exam follows the standard in Appendix II:

• Multiple choice with three options, one correct, and no negative marking.
• About 75 seconds per question, which is where the time for each paper comes from.
• A 75% pass mark for each module.
• Essays in some modules, 20 minutes each, also marked at 75% of the key points.
• A 90-day wait before you can resit a failed module, or 30 days if a Part-147 organisation gives you tailored retraining.

The details of essays and attempts now depend on which system you are in. Since 12 June 2024, EU exams follow Appendix II as replaced by Regulation (EU) 2023/989: essays only in Module 7, and a maximum of three attempts per module in any 12 months. The UK kept the earlier text in UK Part-66: essays in Modules 7, 9 and 10, and three consecutive attempts before a one-year wait. Several paper sizes differ too. Our papers follow either set of rules; you choose on the start screen.

Key fact: Module passes count towards a licence application for 10 years. Keep every certificate of recognition, because you need them all when you apply.

Licence categories and the modules each one sits

There are seven categories on this site. The table shows which modules each sits and how many questions in our bank apply to it.

Category	What it lets you certify	Modules	Questions in our bank	Practice
A	Line maintenance tasks and simple defect rectification (A1–A4)	1, 2, 3, 5, 6, 7, 8, 9, 10, 11A, 11B, 12, 15, 16, 17A (the ones for your subcategory)	8,926	Category A
B1.1	Turbine aeroplanes, mechanical and electrical	1–10, 11A, 15, 17A	7,764	B1.1
B1.2	Piston aeroplanes	1–10, 11B, 16, 17A	6,874	B1.2
B1.3	Turbine helicopters	1–10, 12, 15	7,195	B1.3
B2	Avionics and electrical systems	1–10, 13, 14	7,253	B2
B2L	Avionics with system ratings, for aircraft other than complex motor-powered aircraft	1–10, 13, 14 (per rating)	7,071	B2L
B3	Piston non-pressurised aeroplanes up to 2,000 kg	1–10, 11C, 16, 17B	6,169	B3

A B1 engineer certifies work on the structure, engines and mechanical and electrical systems, and some avionics tasks that only need simple tests. A B2 engineer certifies avionics and electrical work. Category A is the line maintenance mechanic who carries out and certifies minor scheduled tasks within an organisation. The EASA licence categories note explains privileges and experience in more detail.

Every module on one page

Modules 1 to 10 are common to almost every category, though the number of questions grows with the category. Modules 11 to 17 depend on the aircraft and engine type you are licensing for. The Part-66 modules hub lists every module with its paper size for each category under EASA and UK CAA rules, the sub-modules it covers and where to practise.

A few examples of how much the papers differ:

Module	A (EASA)	B1 (EASA)	B2 (EASA)	B1 (UK CAA)
1 Mathematics	16 Q, 20 min	32 Q, 40 min	32 Q, 40 min	32 Q, 40 min
3 Electrical fundamentals	20 Q, 25 min	52 Q, 65 min	52 Q, 65 min	52 Q, 65 min
7 Maintenance practices	76 Q + 2 essays	80 Q + 2 essays	60 Q + 2 essays	80 Q + 2 essays
9 Human factors	28 Q, 35 min	28 Q, 35 min	28 Q, 35 min	20 Q + 1 essay
10 Aviation legislation	32 Q, 40 min	44 Q, 55 min	44 Q, 55 min	40 Q + 1 essay

If you sit with a UK Part-147 school or at a CAA venue, use the UK CAA column. If you sit anywhere in the EU or another EASA state, use EASA. Your Part-147 organisation can confirm which standard its exams follow.

What you get on Part-66 Prep

Exam-style papers sized for your category

Each module has ten exam-style papers for each category that sits it. Paper 1 is free. A paper uses the real question count and timer for your category and authority, spreads the questions over the sub-modules in proportion to the official guidance, and marks you against the 75% line. After you submit, you get your score by sub-module, weakest first, and every question with its explanation.

Try one now: Module 7 paper 1 for B1.1, Module 10 paper 1 for B2 or Module 3 paper 1 for B1.1.

A diagnostic for every category

The free 20-question diagnostic samples every module your category sits, so in about 20 minutes you know which ones need the most work. Start with the B1.1 diagnostic or the B2 diagnostic.

Explanations you can learn from

Each question explains why the right answer is right and, for most questions, why each wrong option is wrong. It also gives the syllabus reference, such as 3.6 DC circuits or 10.3 approved maintenance organisations, so you can go straight to the right part of your notes. Wrong options are built from the mistakes people actually make, as Appendix II asks: a correction applied the wrong way, a unit not converted, a rule from the wrong Part.

Calculation questions with new numbers

Modules 1 to 4 and parts of 8, 15 and 16 have calculations. Many of our calculation questions are templates, so each paper and drill shows new numbers, and you can't pass by remembering answers. CAA venues and many Part-147 schools don't allow calculators, so practise by hand.

Study notes written from the syllabus

There are 149 study notes, one or more for every sub-module, each with its sources. The three exam guides and the first note of every module are free, for example Module 1 arithmetic, Module 7 safety and workshop practices and Module 10 regulatory framework. See them all in study notes.

Printable questions

Every module has a printable sheet of 50 free questions with an answer key, for revising on paper or offline. Open, for example, the Module 10 printable questions and use your browser's "Save as PDF".

Who uses Part-66 Prep

Apprentices and Part-147 students

Your course gives you lessons and progress tests. Use our papers between blocks to find weak sub-modules early and to get used to the clock before the real exam. Ten papers per module means you see the syllabus from many angles, not just the questions your instructor happens to set.

Self-study candidates

Many mechanics and technicians take modules on their own, booking each exam at a Part-147 organisation or a CAA venue when they are ready. Without a course, the hard part is knowing when you are ready. Our readiness rule is simple: three different papers at 85% or more, then book.

Engineers adding a category or moving between systems

If you hold B1 and want B2, or you are adding modules after a move between the EASA and UK systems, you only need certain modules. Pick your category, open the modules you still need and use the paper sizes for the authority you will sit with.

How to prepare for a module exam

1. Book a realistic date. Big modules such as 7, 11A, 13 and 15 take weeks to months; smaller ones such as 8 and 9 can take a couple of weeks of steady evenings.
2. Take the diagnostic for your category to see where you are starting from.
3. Read the notes for the module, starting with the free first note, and keep the official syllabus open from the EASA Easy Access Rules or the UK text so you know what each sub-module expects.
4. Do quick practice every day with instant explanations, for example Module 9 quick practice.
5. Sit full papers against the clock. Paper 1 is free; Pro has nine more per module plus sub-module drills.
6. Book when you score 85% on three different papers. That gives you a buffer above the 75% pass mark for nerves and unfamiliar wording.

For the licence itself, the UK CAA engineer licensing pages and the EASA Part-66 FAQs explain experience, applications and fees. Exams are only one part: you also need logged practical experience before a licence is issued.

Changes coming to Part-66

Part-66 keeps changing, which is one reason old question banks go stale.

• EASA added Module 18. Regulation (EU) 2025/111, applicable since 13 February 2026, created a B1.E subcategory for aeroplanes with electric power plants and a new Module 18 on electric power plants, and restructured Module 11. Existing B1.1 and B1.2 holders have a transition period. Our bank covers Modules 1 to 17; we will add Module 18 once its examination details are settled in the consolidated rules.
• The UK plans to follow, slowly. The CAA consulted in January 2026 on adopting the revised syllabus (merging 7A/7B, 9A/9B, 11A/B/C and 17A/B and adding Module 18). It says the law will be made in 2027 and mostly come into force in 2029, with a four-year transition for courses already started. Until then, UK exams follow the current UK Appendix II, which is what our UK CAA paper sizes use.
• Paper sizes changed in 2024. If a book or website still shows Module 9 with an essay under EASA rules, or Module 8 at 20 questions for an EU exam, it predates Regulation (EU) 2023/989.

We date every page and re-check paper sizes, fees and booking rules every quarter. If you spot something out of date, email us and we will fix it.

Pricing in short

Everything above has a free way in: the diagnostic, quick practice and paper 1 for every module, the exam guides and first notes. Pro costs £6.99 a week, £11.99 a month or £22.99 for three months, billed in pounds by Stripe, and unlocks papers 2 to 10, sub-module drills, the mixed-module paper and every note for all seven categories. Cancel anytime. There is no pass guarantee: the papers help you prepare, and passing is down to you.