How Hard Are the EASA Part-66 Module Exams?

What Makes the Part-66 Module Exams So Challenging?

The Part-66 module exams are not like typical classroom exams. Each one demands precise recall of technical facts, exact regulatory requirements, and the ability to apply complex knowledge to real-world maintenance scenarios. The foundation modules — M1 Mathematics, M2 Physics, M3 Electrical Fundamentals — establish the basics every category requires. The technical modules go deep: M6 Materials and Hardware, M7 Maintenance Practices (the largest exam at 140 questions), M9 Human Factors, M10 Aviation Legislation, M11 Aeroplane Aerodynamics Structures and Systems, M13 Aircraft Structures and Systems, M14 Propulsion, M15 Gas Turbine Engine, M16 Piston Engine, and M17 Propeller.

Administered at approved maintenance training organisations (MTOs), each module has a set question quota and time limit — for example, Module 7 has 140 questions in 175 minutes, Module 11 has 120 questions in 150 minutes, and Module 15 has 108 questions in 135 minutes. To pass, you must score at least 75% (66.A.25). Questions are drawn from the syllabuses in Part-66 Appendix I, where each subject is assigned a depth level — 1 (overview), 2 (detailed) or 3 (in-depth) — and B category licences demand the deeper levels.

What makes these exams particularly difficult is the level of detail required. You are expected to know specific regulation references (such as Part-66 66.A.30 experience requirements), the content of the Certificate of Release to Service, and the precise conditions under which an aircraft can be released to service. This is not a test of general aviation knowledge — it is a test of technical and regulatory precision.

Pass Rates: What the Data Shows

EASA does not publish official pass rates for the individual module exams. However, feedback from approved MTOs and industry training providers consistently suggests that first-attempt pass rates for the foundation modules land in the 65–80% range, with the technical modules varying widely — M9 Human Factors and M1 Mathematics typically pass at higher rates, while M10 Aviation Legislation, M15 Gas Turbine Engine, and the largest systems modules (M11, M13) are more often retaken.

Module 10's legislation portion is a common source of failures. Regulatory questions are abstract and text-heavy, requiring dedicated memorisation and application practice. By contrast, candidates who have worked in a hangar or completed hands-on training tend to find the technical questions in M6 and M7 more intuitive.

It is important to note that these figures are estimates based on industry sources rather than official statistics. However, the consistent pattern across multiple data points confirms that the module exams deserve serious, structured study — and that the practical experience and assessments required by 66.A.30 are where candidates are most likely to be retested.

The 75% Pass Mark: Why It Matters

The 75% pass mark applies to every Part-66 module exam, and it is notably higher than the pass mark used in some other licensing systems — the FAA knowledge tests, for example, require 70%. On Module 10 (64 questions), that means at least 48 correct answers; on Module 7 (140 questions), at least 105. While 75% may sound achievable, the reality is that each question has multiple answer choices, and the distractors are carefully designed to test nuanced understanding rather than surface-level recall.

Common question formats include:

• Direct regulatory recall — "Under Part-66, which of the following must be included in every Certificate of Release to Service?"
• Scenario-based application — "An aircraft undergoes a scheduled maintenance check. The engineer discovers a crack in a wing spar. What approved data applies and what documentation is required?"
• Technical calculation — "What is the total voltage drop in a circuit with... ?" (electrical, physics, and weight & balance problems appear regularly)
• Definition questions — "According to Regulation (EU) No 1321/2014, what is a maintenance training organisation?"

The challenge is that many answer choices are technically correct in a general sense but inaccurate according to the specific regulation or Part-66 syllabus. This requires you to know the material well enough to distinguish between nearly identical statements — a skill that only develops through repeated practice with real exam-style questions.

Retaking a Failed Module: The Stakes

If you fail a module exam, you can retake it at an approved MTO — there is no limit on the number of attempts, though each attempt typically requires a new registration and fee. The practical impact is significant: a failed exam means a return trip to the training organisation, additional fees, and a delay in your licensing timeline. For apprentices close to completing their experience requirements, a failed module can push back the practical assessments — and the promotion that comes with a Part-66 licence.

This is why thorough preparation is not just recommended — it is essential. Treating the module exams as something you will "give a try and see how it goes" is a strategy that costs many candidates time and money. The best approach is to prepare until you are consistently scoring 80% or higher on practice exams before booking your official exam date. Your module exam result shows your performance by subject area, so even a failed attempt gives you a precise map of what to study before retaking.

Proven Study Strategies for the Part-66 Module Exams

Based on feedback from hundreds of successful Part-66 candidates, the following strategies consistently produce the best results:

1. Study the Part-66 Appendix I Syllabus — Not Random Question Banks

Part-66 Appendix I is the authoritative document that defines every subject area and depth level tested on the module exams. Many candidates make the mistake of drilling random question banks without understanding the underlying structure. Use the syllabus as your roadmap: for each module and subject, work through the associated knowledge elements at the required depth level (1, 2 or 3) until you can explain them from memory.

Focus especially on the legislation module (M10), the maintenance practices of M7, and the depth-level 3 subjects of your licence category. Pay special attention to sections that contain numbers, dates, or conditional language ("shall," "may," "must").

2. Use Active Recall with Practice Questions

Passive reading is one of the least effective study methods for technical and regulatory exams. Active recall — testing yourself repeatedly on the material — has been shown by cognitive science research to dramatically improve long-term retention. This is especially important for the Part-66 exams, where the ability to recall specific facts and references under time pressure is critical.

Platforms like Skylicence Europe use adaptive algorithms that generate practice questions calibrated to the Part-66 syllabuses, track your performance across every module, and automatically focus on your weakest areas. This targeted approach is far more efficient than working through a static question bank in order.

3. Create a Reference Sheet for Regulations and Formulas

Build a personal reference document organised by module: for each regulation or requirement, write down the key point in plain English and the exact reference; for each technical area, list the formulas and values you must memorise (Ohm's law, weight & balance equations, load factors, module quotas). The act of writing this document — even if you rarely look at it again — forces your brain to process and organise the information in a way that passive reading does not.

4. Simulate Exam Conditions

Before your official exam, take at least three full-length practice tests under timed conditions for each module (for example, 92 questions in 115 minutes for Module 3, 64 questions in 80 minutes for Module 10). Sit in a quiet room, eliminate all distractions, and do not pause or look up answers during the test. This builds the mental stamina and time-management skills you will need on exam day. Review every incorrect answer in detail afterward — understanding why you got a question wrong is more valuable than getting it right by luck.

5. Allocate at Least 4–6 Weeks of Dedicated Study Per Module

The Part-66 module exams are not something you can cram for in a weekend. Most successful candidates report studying 4 to 6 weeks per module, dedicating 5–10 hours per week to subject-specific review. Spread your study sessions across multiple days rather than doing marathon sessions — spaced repetition is scientifically proven to improve retention for technical material.

How Skylicence Europe Prepares You for the Part-66 Module Exams

Skylicence Europe was built specifically to address the unique challenges of the EASA Part-66 module exams. Our platform offers:

• Syllabus-aligned question banks — 4,464 practice questions across all 17 modules, organised by subject area and directly mapped to Part-66 Appendix I.
• Adaptive difficulty — The AI identifies your weak areas and generates more questions in those domains until you reach mastery.
• Detailed explanations — Every question includes a full explanation with the exact regulation or syllabus reference, so you learn the rule behind the answer.
• Timed practice exams — Full-length simulations that replicate the real module quotas and time limits, complete with the 75% pass-mark calculator.
• Progress analytics — Track your scores by module and subject area and see exactly which sections need more work before exam day.

Start preparing with Skylicence Europe →