EASA Part-66 Module Exam Pass Rates: What the Data Shows

The Reality of EASA Part-66 Module Exam Pass Rates

Every aspiring aircraft maintenance engineer asks the same question: how hard are the module exams really? The honest answer is that the EASA module exams are designed to be challenging — and the pass rates reflect that. While EASA does not publish itemised pass rates for every module at every examination centre, data gathered from maintenance training organisations (MTOs), national aviation authorities, and candidate surveys reveals clear patterns about which modules are the toughest and where candidates tend to struggle most.

Understanding these statistics is not just about satisfying curiosity. Knowing which modules have the lowest pass rates allows you to allocate your study time strategically, focus your preparation efforts where they matter most, and avoid the common mistakes that cause first-time failures. This guide compiles the best available data on EASA Part-66 module exam pass rates and provides actionable strategies to put the odds in your favour.

Estimated Pass Rates by Module

Based on data collected from EASA-approved maintenance training organisations, national CAA exam records, and online Part-66 candidate communities, the estimated first-attempt pass rates for representative module exams are as follows:

Note: These figures are estimates compiled from MTO exam records, national CAA feedback, and candidate surveys. EASA does not release official module-by-module pass rate data. Individual results vary by preparation method, background, and study effort.

Module-by-Module Breakdown

M1 Mathematics — ~75–85% Pass Rate

M1 (32 questions, 40 minutes) consistently shows the highest pass rate of the Part-66 modules. This is because the content — arithmetic, algebra, geometry, trigonometry, and graphs — is taught thoroughly in school and in MTO programmes, and is broadly applicable to all maintenance work. Candidates who struggle with M1 usually do so because they underestimate it. The exam is short, which means pacing matters: 32 questions in 40 minutes leaves little time to double-check calculations. The key to success on M1 is fast, accurate calculation and familiarity with the exact syllabus in Appendix I.

M7 Maintenance Practices — ~65–72% Pass Rate

M7 (140 questions, 175 minutes) tests the practical knowledge every certifying engineer uses daily: safety, workshop practices, tools, engineering drawings, tolerances, riveting, fasteners, wiring, weight and balance, handling, and inspection. The moderate-to-high difficulty comes from the sheer breadth of the subject matter, and B1/B2 candidates must also answer essay questions. Weakness in electrical wiring interconnection systems (EWIS), NDT methods, and weight and balance calculations is a common failure pattern.

M15 Gas Turbine Engine — ~60–68% Pass Rate

M15 (108 questions, 135 minutes) is widely regarded as one of the hardest Part-66 modules, with a low estimated first-attempt pass rate. The exam covers gas turbine theory, compressor and turbine design, combustion, fuel systems, control systems (including FADEC), starting, lubrication, and engine instruments. The challenge is the depth of technical detail required — you need to understand not just how an engine works, but specific tolerances, inspection intervals, and troubleshooting procedures. Successful candidates report spending 40–50% more study time on M15 than on foundational modules like M1 or M2.

Why Do Candidates Fail? Common Failure Patterns

Understanding why candidates fail is just as important as knowing what to study. Across all modules, several recurring failure patterns emerge:

• Underestimating question depth — Many candidates assume the module exams test surface-level knowledge. In reality, questions often require applying multiple concepts to a single scenario. A typical M15 question might ask you to determine the most likely cause of an engine condition using knowledge of fuel, ignition, and indicating systems together.
• Insufficient practice volume — Candidates who attempt fewer than 300 practice questions per module before their exam date have significantly higher failure rates, according to MTO programme data. The largest modules — M7, M11, and M13 — typically require the most practice.
• Poor time management — Each module has a strict time limit (from 40 minutes for M1 to 175 minutes for M7). Candidates who spend too long on difficult questions early in the exam often run out of time for questions they could have answered correctly later.
• Overconfidence in known topics — Candidates who work professionally in one area (e.g., an engineer specialising in engines) sometimes assume M15 will be easy — and then fail because the exam covers topics outside their day-to-day experience.
• Ignoring the Appendix I syllabus — Part-66 Appendix I defines exactly which knowledge elements are covered in each module, at depth levels 1, 2, or 3. Candidates who study from generic or outdated materials rather than aligning their preparation with the syllabus often miss entire topic areas.
• Not using adaptive practice tools — Traditional study methods (reading textbooks, reviewing notes) are passive. Active practice with adaptive difficulty that targets your weak areas is significantly more effective for exam preparation.

How Exam Difficulty Affects Licensing Timelines

The pass rates directly impact how long it takes to complete all the modules for your licence category. Most candidates complete their module exams within 12 to 24 months, often while working. However, candidates who fail one or more modules on their first attempt can face significant delays because of the 30-day minimum wait between attempts and the 12-month wait after three consecutive failures (66.A.25). In practice, failing even one module can add 1–3 months to your licensing timeline depending on examination centre availability.

The most efficient strategy is to attempt the hardest modules (M15, M7, then M11/M13) when you are most prepared and have the most study time available. Many successful candidates take the foundational modules (M1, M2, M8) first as confidence builders, then schedule the harder modules with more preparation behind them. For a complete guide to structuring your study schedule, see our EASA Part-66 module exam structure guide.

Tips to Beat the Averages

While the statistics may seem daunting, thousands of candidates pass these exams every year. Here is what the most successful candidates do differently:

• Start early and study consistently — Cramming is the number one cause of failure. The human brain learns best through spaced repetition — studying for 45–60 minutes daily over 6–12 weeks is far more effective than 6-hour sessions on weekends. Skylicence Europe's AI-powered platform uses spaced repetition algorithms to optimise your study schedule automatically.
• Use adaptive difficulty practice — Instead of studying linearly, start with easier questions to build foundational knowledge and let the system progressively challenge you with harder questions as your confidence grows. This approach, used by Skylicence Europe, ensures you are always studying at the edge of your ability — the zone where learning is most efficient.
• Simulate real exam conditions — Before your exam date, complete at least 3–5 full-length timed practice exams per module using the official question quotas and time limits. This builds exam-day stamina, teaches you to manage time under pressure, and reveals which question formats you find most challenging.
• Analyse your mistakes — Every wrong answer is a learning opportunity. The most effective candidates spend as much time reviewing their mistakes as they do answering new questions. Detailed answer explanations that explain not just why the correct answer is right, but why each wrong option is wrong, accelerate this learning process dramatically.
• Focus on your weakest modules first — If pass rate data shows M15 is the toughest module, do not save it for last. Tackle your hardest module when your motivation and study momentum are highest. The confidence boost from passing a hard module will carry you through the rest.
• Join a community of candidates — Studying in isolation is harder than studying with peers. Engaging with other Part-66 candidates through forums, study groups, or social media communities helps you discover new perspectives, clarify confusing topics, and stay motivated.

How Skylicence Europe Improves Your Chances

Skylicence Europe was built specifically for the EASA Part-66 module exams. Unlike generic quiz apps or outdated question banks, Skylicence Europe's AI-powered platform is tailored to the Part-66 Appendix I syllabus and the official exam structure. Here is how it helps you beat the averages:

• AI-powered adaptive difficulty — The platform continuously assesses your performance and adjusts question difficulty in real time. If you are strong on electrical theory but weak on fuel systems, you will see more fuel system questions until you reach mastery.
• Appendix I-aligned question bank — Every question maps directly to a specific knowledge element in Part-66 Appendix I, across all 17 modules and 8 licence categories. You can track your coverage progress and identify gaps immediately.
• Detailed explanations — Each question includes a thorough explanation of why each answer option is correct or incorrect, with references to the module syllabus and EASA AMC/GM, turning every practice session into a learning session.
• Performance analytics — See your score by module, by knowledge element, and by question type. Identify exactly where you need more practice at a glance.
• Timed practice exams — Simulate the real exam experience with the official question quotas and time limits from Appendix II, including the 75% pass mark.

Start your EASA Part-66 exam preparation with Skylicence Europe →

Frequently Asked Questions

Does EASA publish official pass rates?

No, EASA does not publicly release itemised pass rate data for individual module exams at each examination centre. The figures cited in this article are estimates compiled from MTO exam records, national CAA feedback, and candidate surveys. For official information about the exams themselves, consult Part-66 Appendix I (syllabus) and Appendix II (examination standard).

Which EASA module exam has the lowest pass rate?

Based on available data, M15 (Gas Turbine Engine) has the lowest estimated first-attempt pass rate at approximately 60–68%. M7 (Maintenance Practices) follows at 65–72%, while M1 (Mathematics) has the highest estimated pass rate at approximately 75–85%.

Can I retake a failed module exam immediately?

No. Under 66.A.25, you must wait at least 30 days before retaking a failed module exam, and you may take a maximum of three consecutive attempts per module — after the third consecutive failure you must wait 12 months. Use the waiting time wisely — analyse your results, identify weak areas, and focus your practice on those specific knowledge elements.

How many practice questions should I do per module?

Most successful candidates report completing 300–500 practice questions per module before their exam date. For the largest modules (M7, M11, M13) and the hardest (M15), many candidates do 500–700 questions. The quality of practice matters as much as quantity — ensure you are reviewing explanations for every question, not just counting reps.

For a more detailed look at each module's structure, question format, and preparation requirements, visit our EASA Part-66 module exam structure guide or explore our recommended study resources.