Part-66 Questions: Practice Questions and Mock Exams for Every Module

Part-66 questions are what stand between you and each module pass, and every module has its own set: a different paper size for each licence category, sometimes a different size again under UK CAA rules, and a mix of recall, reasoning and calculation. This hub brings all of it together. It explains how Part-66 exam questions are built, gives the question count for every module and category in one table, links the practice page for each module and sets out a plan for using practice questions so they actually raise your score.

Part-66 Prep is an independent study aid. We are not EASA, the UK CAA or a Part-147 approved maintenance training organisation, and every question on this site is an original exam-style question written for our app. If you are looking for whether official past papers exist, the Part-66 past papers guide covers that in full; this page is about practising.

What Part-66 questions are and how they are built

A Part-66 question is a multiple-choice item with three possible answers, one of them correct, written to the examination standard in Appendix II to Part-66. That standard sits in Regulation (EU) No 1321/2014 for EASA Part-66 (replaced for exams from 12 June 2024 by Regulation (EU) 2023/989) and in the retained UK Part-66 text for the UK system.

The rules that shape every question are simple to state:

• Three options, one correct. A four-option bank does not match the real format.
• Plausible wrong answers. Distractors must look equally likely to someone who does not know the subject.
• Procedural-error distractors in calculations. Wrong numbers come from mistakes a candidate could really make, such as a missed unit conversion.
• Questions follow the syllabus level. Appendix I gives every sub-module a knowledge level from 1 to 3 for each category, and the questions are written to that depth.
• Questions stay secure. Under 66.B.200, exam questions are not published, so nobody can legitimately sell the questions you will see on the day.

A Part-66 basic knowledge examination is one paper per module, sized for your category. Time is 75 seconds a question, the pass mark is 75% and a wrong answer simply scores zero. The Part-66 exam format guide works through timing, marks needed and partial exams in detail.

Why the same module gives different papers

A knowledge level is the depth at which a category must know a sub-module: level 1 is familiarity, level 2 is general theoretical and practical knowledge and level 3 is detailed knowledge. A B1 candidate sits more Module 6 questions than a category A candidate because the B1 levels are higher across more sub-modules, not because the subject changes. The syllabus is the same; the depth, and so the question count, is not.

Key fact: Every Part-66 paper size is a multiple of four, so 75% always comes to a whole number of correct answers: 24 out of 32, 39 out of 52, 60 out of 80.

Part-66 questions by licence category

Your licence category decides which modules you sit and how many questions each paper holds. The table totals the multiple-choice questions across every module paper for each category, taken from the paper sizes in our data, which follow Appendix II.

Category	Module papers	Total questions, EASA	Total questions, UK CAA	Essays, EASA / UK	Questions in our bank	Free diagnostic
A	15	712	692	2 / 4	8,926	Category A
B1.1	13	716	692	2 / 4	7,764	B1.1
B1.2	13	660	612	2 / 4	6,874	B1.2
B1.3	12	672	648	2 / 4	7,195	B1.3
B2	12	684	652	2 / 4	7,253	B2
B2L	12	684	652	2 / 4	7,071	B2L
B3	13	552	448	2 / 4	6,169	B3

Category A counts every module a subcategory might need (11A, 11B, 12, 15, 16 and 17A); a real A1 or A3 candidate sits only the modules for their subcategory. For B2L, the site uses the full B2 Module 13 paper; the real B2L Module 13 is examined per system rating, so check the size with your exam centre. The Part-66 modules by category list shows exactly which modules each category and subcategory needs.

Each diagnostic is 20 questions in 20 minutes, spread across the modules your category sits. It is the fastest way to see which modules need the most work before you open a single paper.

Exam tip: If you hold or plan a second category, the shared Modules 1 to 10 are not always the same size. Module 5 is 40 questions for B1.1 but 72 for B2, so do not assume a module carries over between categories: check the credit rules with your competent authority first.

Part-66 questions by module

The table below gives the question count for every module paper and category. Where EASA and UK CAA rules differ, the EASA figure comes first and the UK figure second. "+2E" means the paper also has two essays. Each module name links its full question guide, with the sub-modules and what examiners test.

Module	A	B1.1	B1.2	B1.3	B2 / B2L	B3	Our bank	Free paper 1
1 Mathematics	16	32	32	32	32	32 / 28	326	B1.1
2 Physics	32	52	52	52	52	32 / 28	527	B1.1
3 Electrical fundamentals	20	52	52	52	52	24	620	B1.1
4 Electronic fundamentals	–	20	20	20	40	20 / 8	437	B2
5 Digital techniques	20 / 16	40	40 / 20	40	72	20 / 16	742	B2
6 Materials and hardware	52	80 / 72	80 / 72	80 / 72	60	80 / 60	860	B1.1
7 Maintenance practices	76 / 72 +2E	80 +2E	80 +2E	80 +2E	60 +2E	80 / 60 +2E	884	B1.1
8 Basic aerodynamics	24 / 20	24 / 20	24 / 20	24 / 20	24 / 20	24 / 20	266	B1.1
9 Human factors	28 / 20 +1E	28 / 20 +1E	28 / 20 +1E	28 / 20 +1E	28 / 20 +1E	28 / 16 +1E	330	B1.1
10 Aviation legislation	32 / 32 +1E	44 / 40 +1E	44 / 40 +1E	44 / 40 +1E	44 / 40 +1E	44 / 32 +1E	482	B1.1
11A Turbine aeroplane	108	140	–	–	–	–	1,509	B1.1
11B Piston aeroplane	72	–	100	–	–	–	821	B1.2
11C Piston aeroplane (B3)	–	–	–	–	–	60	564	B3
12 Helicopter	100	–	–	128	–	–	1,283	B1.3
13 B2 aircraft systems	–	–	–	–	188 / 180	–	1,911	B2
14 Propulsion (B2)	–	–	–	–	32 / 24	–	352	B2
15 Gas turbine engine	60	92	–	92	–	–	941	B1.1
16 Piston engine	52	–	76 / 72	–	–	76 / 68	739	B1.2
17A Propeller	20	32	32	–	–	–	343	B1.1
17B Propeller (B3)	–	–	–	–	–	32 / 28	247	B3

The "+1E" on Modules 9 and 10 applies only under UK CAA rules: since 12 June 2024, EASA papers have essays in Module 7 alone. Each module guide repeats its own row with the times, and the Part-66 modules hub groups the modules by subject and suggests an order to take them.

Where the question counts bite

The big papers get the attention, but the short ones catch people out. On Module 8 under UK rules you can afford only five wrong answers out of 20. On Module 1 for category A it is four out of 16. Long papers such as Module 11A or Module 13 are tests of stamina and pacing more than of margin: you have 35 wrong answers to spare on a 140-question paper, but you have nearly three hours to stay sharp.

The modules with the largest banks on this site are 13, 11A and 12, because they are the broadest syllabuses. Smaller banks, such as Module 8 or 17B, reflect shorter syllabuses, not lighter treatment: each paper still covers every sub-module.

Exam tip: Pick your system on the start screen before your first paper. Practising Module 9 at the EASA size of 28 questions when you will sit the UK paper of 20 plus an essay trains the wrong pace and skips the essay entirely.

Types of Part-66 questions: recall, reasoning, calculation and essay

Part-66 questions fall into four practical types, and each needs a different kind of practice. The exam does not label them, but you will recognise them within a few papers.

Recall questions

A recall question asks for a fact, a definition or a limit: what a component is called, which document holds a record, what a regulation requires. They dominate Modules 9 and 10 and the descriptive parts of Modules 6, 7, 11 and 13. They are quick if you know the answer and impossible to reason out if you don't, so they reward regular short sessions with explanations switched on.

Reasoning and "which is NOT" questions

A reasoning question gives a situation and asks what follows: what happens to a reading if a component fails, which action is correct in a given order, which statement is not correct. Negative stems are common and easy to misread under time pressure. They appear in every module and are where well-built distractors do most damage, because two options are often partly true.

Calculation questions

A calculation question asks you to work a number by hand, with the two wrong options built from common procedural errors. They are central to Modules 1, 2 and 3, and appear in Module 4 (gain and voltage), Module 7 (torque correction and weight and balance), Module 8, Module 15 (thrust and fuel consumption) and Module 16 (displacement, compression ratio and power). CAA venues did not list calculators as an approved item when we checked in October 2026, so practise by hand.

Here is a short example of our own to show how the distractors work. A fuel tank holds 1,200 litres and the gauge reads 35% full. How much fuel is needed to fill it? The options might be 420 litres, 780 litres and 1,620 litres. The correct answer is 780 litres (65% of 1,200). The 420 comes from working out what is already in the tank, and the 1,620 from adding 35% to the capacity. Each wrong option is a mistake you could make in a hurry, which is exactly why they work.

On this site, calculation questions get new numbers from the app's generator on each paper, so you practise the method rather than remembering an answer.

Essay questions

A Part-66 essay is a written answer to a set topic, marked against the key points of a model answer; you pass with 75% of the required key points and no significant error. Under EASA rules there are two essays, in Module 7 only. Under UK CAA rules there are two in Module 7 and one each in Modules 9 and 10. Each essay has 20 minutes on top of the multiple-choice time.

Essays are not marked on the site. The start screen of each paper tells you how many the real paper has, and the app includes an essay coach. The Part-66 essay questions guide explains key-point marking and how to structure an answer.

Key fact: If you pass the multiple-choice part of a module and fail only the essay, or the other way round, you resit only the part you failed.

How to use Part-66 practice questions

Part-66 practice questions work best as a diagnostic tool, not a memory test: each wrong answer points to a sub-module you need to relearn. Here is how the practice on this site is set up and how to move through it. For how to sit a full timed paper under exam conditions, see our guide to the Part-66 mock exam.

Practice	Questions	Access	Use it for
Diagnostic	20 across your category	Free, no account	Finding your weakest modules
Quick practice	20 per module, instant explanations	Free, no account	Learning a module
Paper 1	Full real size and time	Free, no account	Your first timed mock for each module
Printable sheet	50 per module with answer key	Free	Revising on paper or offline
Papers 2 to 10	Full real size and time	Pro	Repeated mocks on unseen papers
Sub-module drills	By sub-module	Pro	Fixing one weak area
Mixed-module paper	60 questions, 75 minutes	Pro	Keeping earlier modules fresh

Every paper uses three options, 75 seconds a question, a 75% pass line and no negative marking, sized for your category under EASA rules by default or UK CAA rules if you choose them. Questions are spread over the sub-modules in line with the acceptable means of compliance to Appendix II, so a paper reflects the weight of each topic.

A cycle that works

1. Learn first. Read the study note for a sub-module, for example Module 7 safety and workshop practices, then do quick practice with explanations on.
2. Sit a full paper. Use the real size, the timer and no notes. Paper 1 is free for every module.
3. Sort the misses. List wrong answers by sub-module. Two or three in the same sub-module tell you what to reread.
4. Drill the weak spot. Go back to the notes, then practise that sub-module alone, for example Module 7 weight and balance.
5. Move to a new paper. Repeating a paper you sat yesterday measures memory, not knowledge.

Questions and answers or timed papers?

Both have a place. Untimed questions with answers, such as quick practice and the printable Module 10 sheet, are for learning. Timed papers are for rehearsal: they show whether you can hold 75% at 75 seconds a question. Spend the early weeks of a module on the first, and the last week or two on the second.

If you are working through modules without a course, the Part-66 self-study guide covers fitting this around shifts, and the EASA and UK CAA exam guides summarise each system's rules.

Exam tip: Keep a one-line log after every paper: module, paper number, system, score and weakest sub-module. Three entries in, the pattern usually tells you more than the scores.

Your study plan

Work through these steps in order, one module at a time:

1. Take the free diagnostic for your category, for example the B1.1 diagnostic or the B2 diagnostic, to see which modules are weakest.
2. Choose your first module from the table above and open its guide. Many candidates start with Modules 1 to 3 or with Module 7; the modules hub explains the usual orders.
3. Learn with quick practice, for example Module 1 quick practice, alongside the module's free study note such as Module 1 arithmetic.
4. Sit free paper 1 under real conditions, for example Module 10 paper 1 for B1.1, with the right system selected.
5. Review by sub-module and fix the weak areas before the next paper.
6. Sit more unseen papers. Papers 2 to 10, sub-module drills and the mixed paper come with Pro, for all seven categories on one plan. There is no pass guarantee: practice raises your odds, and passing is down to your preparation on the day.
7. Book when you are ready. Once you score 85% or more on three different papers, book through your Part-147 organisation or, in the UK, through the CAA engineer licensing pages. For EASA questions on exams and licences, the EASA Part-66 FAQs are the place to start.