Part-66 Modules by Category: A, B1.1, B1.2, B1.3, B2, B2L and B3

Searching for "B1 modules" or a "B1.1 modules list" usually turns up all 17 modules and leaves you to pick out yours. This page works the other way: it starts from your licence category and gives you the exact Part-66 modules by category, the sub-module letters (11A, 11B, 11C, 7A, 7B and the rest) decoded, the number of questions on every paper you will sit under EASA and UK CAA rules, and a sensible order to take them in. Each module links to its practice questions.

Part-66 Prep is an independent study aid, not EASA, the UK CAA or a Part-147 organisation. The module list for each category comes from the modularisation table in Appendix I to Part-66, and the paper sizes from Appendix II: for the EU in Regulation (EU) No 1321/2014 as amended by Regulation (EU) 2023/989 (applied from 12 June 2024), and for the UK in the retained UK Part-66 text. If you want what each module covers rather than who sits it, read the Part-66 modules guide.

Part-66 modules by category: the master table

Modules 1 to 10 are the common core. After that, your category adds two or three specialist papers that match the aircraft and engine you will certify.

Category	Core modules	Airframe	Engine	Propeller	Papers
A1 turbine aeroplanes	1–3, 5–10 (no 4)	11A	15	17A	12
A2 piston aeroplanes	1–3, 5–10 (no 4)	11B	16	17A	12
A3 turbine helicopters	1–3, 5–10 (no 4)	12	15	none	11
A4 piston helicopters	1–3, 5–10 (no 4)	12	16	none	11
B1.1 turbine aeroplanes	1–10	11A	15	17A	13
B1.2 piston aeroplanes	1–10	11B	16	17A	13
B1.3 turbine helicopters	1–10	12	15	none	12
B1.4 piston helicopters	1–10	12	16	none	12
B2 avionics	1–10	13	14	none	12
B2L avionics, system ratings	1–10	13 (parts per rating)	14 (some ratings)	none	varies
B3 light piston aeroplanes	1–10 (UK: 7B, 9B)	11C	16	17B	13

Key fact: The quickest way to read your list is "1 to 10, plus the airframe module, plus the engine module, plus the propeller module if you have one". Turbine means 15, piston means 16, helicopters mean 12, avionics means 13 and 14.

This site practises A (all A modules in one category), B1.1, B1.2, B1.3, B2, B2L and B3; B1.4 is shown for completeness.

What the module letters mean

EASA and the UK now name some modules differently, which is where most of the confusion comes from.

11A, 11B and 11C

All three cover aeroplane aerodynamics, structures and systems. 11A is the turbine version (A1, B1.1), 11B the piston version (A2, B1.2) and 11C the B3 version for light piston aeroplanes. Since June 2024 the EU text presents Module 11 as one module with separate columns for A1, A2, B1.1, B1.2 and B3, but the papers are still different for each, so the 11A, 11B and 11C labels remain in everyday use and on this site. All three are practised from the Module 11 questions page.

7A and 7B, 9A and 9B

Only the UK keeps these splits. Under UK rules every category except B3 sits Module 7A and Module 9A; B3 sits the shorter 7B and 9B. Under EASA rules Module 7 and Module 9 are single modules, with the paper length still set by category. See the Module 7 questions and Module 9 questions pages for the content differences.

13 and 14

These are the avionics engineer's version of the airframe and engine papers. Module 13 covers the aircraft and its systems at B2 depth, with avionics in detail; Module 14 covers propulsion from the indicating, starting and ignition side. B2L candidates sit Module 13 in parts, one for each system rating, plus a basic part; Module 14 applies only to the instruments and airframe systems ratings. The B2L licence guide lists each part.

15 and 16, 17A and 17B

Module 15 is the gas turbine engine and Module 16 the piston engine. Module 17A is the propeller module for A1, A2, B1.1 and B1.2, and 17B is the B3 version. Helicopter categories have no propeller module: rotor systems sit inside Module 12.

Exam tip: When you book, check the module code and category on the booking form. Under UK rules 7B and 9B are the B3 papers, not the ones B1 and B2 candidates sit, and the same module number can be a different paper length for different categories, so book the version your licence needs.

Module 18 and B1.E (EASA only)

Regulation (EU) 2025/111, applicable from 13 February 2026, adds subcategory B1.E for electric-powered aeroplanes and a Module 18 on electric power plants, and restructures Module 11. EASA now has 18 modules; this site covers Modules 1 to 17 and has no Module 18 questions yet. UK exams still follow the current UK Appendix II.

Question counts per module for every category

Each module paper is three-option multiple choice, about 75 seconds per question, with a 75% pass mark. The tables below give questions per paper. Where a cell shows "+ 2E" or "+ 1E", the paper also has that many essays of 20 minutes each.

Under EASA rules (from 12 June 2024)

Module	A	B1.1	B1.2	B1.3	B2 / B2L	B3
1	16	32	32	32	32	32
2	32	52	52	52	52	32
3	20	52	52	52	52	24
4	–	20	20	20	40	20
5	20	40	40	40	72	20
6	52	80	80	80	60	80
7	76 + 2E	80 + 2E	80 + 2E	80 + 2E	60 + 2E	80 + 2E
8	24	24	24	24	24	24
9	28	28	28	28	28	28
10	32	44	44	44	44	44
11A / 11B / 11C	108 (11A), 72 (11B)	140	100	–	–	60
12	100	–	–	128	–	–
13	–	–	–	–	188	–
14	–	–	–	–	32	–
15	60	92	–	92	–	–
16	52	–	76	–	–	76
17A / 17B	20	32	32	–	–	32

Under UK CAA rules

Module	A	B1.1	B1.2	B1.3	B2 / B2L	B3
1	16	32	32	32	32	28
2	32	52	52	52	52	28
3	20	52	52	52	52	24
4	–	20	20	20	40	8
5	16	40	20	40	72	16
6	52	72	72	72	60	60
7A / 7B	72 + 2E	80 + 2E	80 + 2E	80 + 2E	60 + 2E	60 + 2E (7B)
8	20	20	20	20	20	20
9A / 9B	20 + 1E	20 + 1E	20 + 1E	20 + 1E	20 + 1E	16 + 1E (9B)
10	32 + 1E	40 + 1E	40 + 1E	40 + 1E	40 + 1E	32 + 1E
11A / 11B / 11C	108 (11A), 72 (11B)	140	100	–	–	60
12	100	–	–	128	–	–
13	–	–	–	–	180	–
14	–	–	–	–	24	–
15	60	92	–	92	–	–
16	52	–	72	–	–	68
17A / 17B	20	32	32	–	–	28

Two details are easy to miss. Under UK rules the B1.2 Module 5 paper is 20 questions against 40 for B1.1 and B1.3, while under EASA rules all three B1 subcategories sit the same 40. And for B2L, the real Module 13 is examined per system rating (for example 24 questions for the com/nav part under both systems); on this site the B2L Module 13 paper uses the full B2 size, so B2L candidates practise more than they need for a single rating.

Totals per category: papers, questions and time

Times include 20 minutes per essay.

Category	Papers	EASA questions	EASA time	UK CAA questions	UK CAA time	Essays (EASA / UK)
A1	12	488	10 h 50 min	468	11 h 5 min	2 / 4
A2	12	444	9 h 55 min	424	10 h 10 min	2 / 4
A3	11	460	10 h 15 min	440	10 h 30 min	2 / 4
A4	11	452	10 h 5 min	432	10 h 20 min	2 / 4
B1.1	13	716	15 h 35 min	692	15 h 45 min	2 / 4
B1.2	13	660	14 h 25 min	612	14 h 5 min	2 / 4
B1.3	12	672	14 h 40 min	648	14 h 50 min	2 / 4
B1.4	12	656	14 h 20 min	608	14 h	2 / 4
B2	12	684	14 h 55 min	652	14 h 55 min	2 / 4
B3	13	552	12 h 10 min	448	10 h 40 min	2 / 4

B2L is left out because its total depends on the ratings you choose. The B2L guide works through examples.

Key fact: B1.1 is the biggest set of basic papers in both systems, and B3 has the largest gap between the two: about 100 more questions under EASA rules than under UK rules.

The B1 modules list, subcategory by subcategory

B1.1 modules list

B1.1 is the turbine aeroplane licence, so it adds the turbine airframe (11A), the gas turbine engine (15) and propellers (17A) to the core. 11A at 140 questions and Module 15 at 92 are the two longest papers in the set. Free starting points: 11A paper 1, Module 15 paper 1 and 17A quick practice.

B1.2 modules list

B1.2 swaps the turbine papers for piston ones: 11B and Module 16, and keeps 17A. Under UK rules it is also the B1 subcategory with the shortest Module 5. Try 11B paper 1 and Module 16 quick practice.

B1.3 modules list

B1.3 is the turbine helicopter licence. It shares Modules 1 to 10 and Module 15 with B1.1 at the same paper sizes, then replaces 11A and 17A with Module 12 (128 questions), which covers rotor aerodynamics, transmissions and helicopter systems. Start with Module 12 paper 1. For privileges, experience and type ratings across all four subcategories, see the B1 licence guide.

B2 and B2L modules

B2 candidates sit the same Modules 1 to 10 as B1, but at different depth: Module 4 doubles to 40 questions and Module 5 rises to 72, while Module 6 and Module 7 drop to 60. Then comes Module 13, the longest single paper in Part-66 (188 under EASA, 180 under UK rules), and the short Module 14. The free Module 13 paper 1 for B2 shows what 235 minutes of systems questions feels like. Read the B2 licence guide for privileges and experience, and the B2L guide for the system ratings.

B3 licence modules

B3 covers piston, non-pressurised aeroplanes of 2,000 kg MTOM or less, and its module list mirrors B1.2: core modules, then 11C, Module 16 and 17B. The paper sizes are where B3 differs, especially under UK rules, where Module 4 is only 8 questions and Module 6 is 60. Module 11C quick practice is a good first look. The B3 licence guide compares B3 with B1.2.

Category A modules

Category A follows the B1 pattern without Module 4 and with shorter papers (Module 3 is 20 questions against 52). See the category A licence guide.

Adding a second category: which modules overlap

Many engineers add a category later, most often B1.1 to B2 or B1.1 to B1.3. The paper sizes show where the overlap is, but they are not the whole story: the syllabus in Appendix I sets a knowledge level for each sub-module per category, and the EASA Part-66 FAQs say that the competent authority that issued your licence carries out a gap analysis and may give credit for basic knowledge you already hold. Treat this table as a starting point for that conversation.

You hold	You want	New modules	Shared modules that may need the higher-level paper
B1.1	B1.3	12	none on paper size: 1 to 10 and 15 match
B1.1	B1.2	11B, 16	none on paper size
B1.2	B1.1	11A, 15	UK: Module 5 (40 against 20)
B1.1	B2	13, 14	4 (40 against 20), 5 (72 against 40)
A1	B1.1	4	B1-level versions of 1, 2, 3, 5, 6, 7, 10 and the specialist modules

You also need extra experience for the new category, set out in Appendix IV to Part-66; the experience requirements guide explains it.

Two UK points from the CAA engineer knowledge requirements page are worth knowing. The CAA treats an essay pass at category A level as equivalent to a category B pass, so A-level essay certificates count towards a B application. And the UK does not accept EASA Part-147 certificates of recognition dated after 31 December 2022, which matters if you trained in the EU and want a UK licence.

Exam tip: Get the gap analysis in writing before you study for an extension. Sitting a paper you did not need costs a fee and an attempt; skipping one you did need delays the licence.

Recommended order for your modules

Neither EASA nor the UK CAA fixes an order, and Part-147 courses follow their own programme. For self-study, this order works for most categories:

1. Modules 1, 2 and 3: maths, physics and electrics underpin almost everything after them.
2. Modules 8 and 9: short papers that give early passes and get you used to exam conditions.
3. Modules 4, 5 and 6: electronics, digital systems and materials.
4. Module 10, once you have seen some real maintenance paperwork.
5. Module 7, which draws on 6 and needs essay practice.
6. Your specialist modules last, starting with the engine paper and finishing with the airframe paper (11A, 11B, 11C, 12 or 13), the longest.

Adjust it for your category:

Category	Adjustment
B1.1, B1.3	Leave 11A or 12 and Module 15 until last; together they are around a third of your questions.
B1.2, B3	Module 16 sits well straight after Module 6, while engine hardware is fresh.
B2, B2L	Take 3, 4 and 5 back to back: they are your heaviest core papers and Module 13 builds on them.
A	Your papers are shorter, so pair them: 1 with 2, 8 with 9, and 15 or 16 with 17A.

Whatever the order, plan around the retake rules: 90 days before a resit (30 after tailored Part-147 retraining), three attempts per module in any 12 months under EASA rules, and three consecutive attempts then a one-year wait under UK rules. The Part-66 exams guide covers booking and attempts.

Practice questions for every module

Each module has its own questions page with sample questions and links into the practice tool:

Modules 1 to 9	Modules 10 to 17
Module 1 questions	Module 10 questions
Module 2 questions	Module 11 questions (11A, 11B, 11C)
Module 3 questions	Module 12 questions
Module 4 questions	Module 13 questions
Module 5 questions	Module 14 questions
Module 6 questions	Module 15 questions
Module 7 questions	Module 16 questions
Module 8 questions	Module 17 questions (17A, 17B)
Module 9 questions

Papers are sized for your category under EASA or UK CAA rules, chosen on the start screen. They are original exam-style papers, not past papers, which neither authority publishes.

Your study plan

1. Find your column in the master table and write down your papers, using the UK names (7A, 9B and so on) if you sit under UK CAA rules.
2. Take the free diagnostic for your category: A, B1.1, B1.2, B1.3, B2, B2L or B3. It samples every module you sit and shows where to start.
3. Begin with Module 1: read the free arithmetic note, do the 20-question quick practice, for example Module 1 quick practice for B1.1, then sit paper 1 against the clock.
4. Book a module once you score 85% or more on several different papers. Papers 2 to 10 and the sub-module drills come with Pro; there is no pass guarantee, only more practice.
5. Keep every certificate of recognition together. You will need the full set for your licence application, and each pass counts for 10 years.