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EASA Part-66 Exam Preparation
UK CAA Part-66 Compatible Australia CASA Part 66
Updated to EU 2023/989 & 2025/111
Intelligent Progress Center
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EASA Part-66 Exam Preparation Online

Practice with thousands of EASA Part-66 exam questions across all 18 modules, track your progress, and join a community of aviation maintenance engineers preparing for their licence. New to it? Read what EASA Part-66 is — the licence, modules and exams explained.

Every question explained: all 17,000+ EASA Part-66 questions come with a clear, regulation-grounded explanation shown the moment you answer — so you understand why, not just memorise the answer.

Essays marked in seconds: Modules 7, 9 and 10 are examined by written essay, and multiple choice cannot prepare you for one. Write a real answer here against the 20-minute clock and get it back marked against the examiner Key Points — each one covered or missed, 75% to pass. Try Essay Practice →

Practise one chapter at a time: a whole-module quiz cannot tell you whether the topic you studied this morning went in. Drill a single syllabus chapter instead — ten questions from that chapter and nothing else, across 307 chapters in all 18 Part66 modules. It records no quiz result, so a bad run cannot dent your module average — but your mistakes still feed Weak Areas. Open any module below and choose By chapter.

It works out what to study next: the Intelligent Progress Center reads every answer you give and ranks your weakest syllabus chapters — not by raw score, but by how confident the evidence makes it that the gap is real, so eight answers at 50% outrank one unlucky question. It names the chapter, opens the drill and links the study note. Module readiness, an eight-week study map and where your effort actually went come with it.

All EASA module content aligned with Commission Implementing Regulation (EU) 2023/989 and (EU) 2025/111, which added Module 18 and subcategory B1.E from 13 February 2026 — covering categories A, B1, B2, B2L, B3 and B1.E. UK CAA Part-66 candidates: the 75% pass mark and question format are the same, but the UK still examines to its 2020 syllabus text, and Module 10 differs. UK CAA vs EASA → UK candidates can practise UK CAA Module 10, written to UK law, next to the 18 EASA modules. Valid prep for Australia's CASA Part 66 self-study exams too. CASA vs EASA →

Part-66 worldwide: the same module-based study also prepares you for Part-66-aligned exams in the UAE (GCAA CAR-66), Qatar (QCAR Part-66), Singapore (SAR-66), Hong Kong (HKAR-66) and India (DGCA CAR-66) and Kenya (KCAA), plus where EASA / UK-CAA Part-66 exams are sat locally in Egypt (ECAA) and Nigeria (NCAA).

Aircraft Type Training: practice question banks for the Airbus A320 (CEO & NEO), A220 and A330 and Boeing 737NG, 737 MAX and 787, organised by ATA chapter with worked answers and timed practice.

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4. Electronic fundamentals

ICs are classified by integration: SSI (1-10 gates), MSI (10-100), LSI (100-10,000), VLSI (10,000+).

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Recent Q&A Activity

P

Thanks for raising this. Module 12 is Helicopter Aerodynamics, Structures and Systems, so it covers the whole helicopter, not only the rotor-specific parts. Many of its systems topics are the same as on aeroplanes, and they are examined that way. ILS is in scope. The avionic systems section of the Module 12 syllabus includes navigation systems, and helicopters certified for instrument flight fly ILS approaches just as aeroplanes do. You should expect ILS questions in the real exam. Cargo compartment classes are a closer call. The Module 12 syllabus covers fire protection (detection and extinguishing) and cabin and cargo layout, including cargo retention, so cargo fire protection is fair game. The Class A, B, C classification itself comes from large aeroplane certification, though, so a question that rests entirely on those classes is more aeroplane than helicopter. On contesting: if you think a question in your real exam is outside the syllabus, raise it with the organisation or au…

PART66Online replied to kenguan76's question ·5h ago

K

I've been going through some of the sample questions from this website & also from other sources, and I find that there are some questions in Module 12 that is not "related" to helicopters. Do these questions pop up in the actual Module 12 exam? And if they do, can we "contest" it as not related to the module? Example of questions (I stand corrected if some of them are actually related to helicopters): 1. Cargo containment class A, B, C... 2. ILS system

kenguan76 asked a question ·7h ago

P

Thanks for flagging this - you are right. Fibre optic cable on Airbus aircraft has a purple (violet) outer jacket. The Airbus-qualified fibre cable (ABS0963 / EN 4641-100) is purple, which matches what you saw on the A320neo. This question was originally keyed purple. Earlier this year it was changed to orange during a review, on the basis that orange is the standard fibre colour. That is true for ground telecom cabling (TIA-598 uses orange for multimode and yellow for single-mode fibre), but it is not how fibre is identified in Airbus aircraft wiring, so that change was a mistake. I have moved the correct answer back to purple and rewritten the explanation. The question now also says which aircraft it means, so it no longer implies one colour for every manufacturer: "On Airbus aircraft, fibre optic cable can be identified by its jacket colour, which is" Hands-on checks like yours are the best way we have of catching this kind of thing, so please keep reporting anything …

PART66Online replied to Rhysfaulkner96's question ·2d ago

R

they are purple ??? was literally looking at fibre optic cables on a A320 neo.

Rhysfaulkner96 asked a question ·2d ago

P

Good question, and you're right. A high body temperature, from a fever or from working in heat, also slows you down and makes mistakes more likely, so as this question was worded both "high" and "low" body temperature were true. What the question is really after is the circadian rhythm, the body's daily clock. Over a normal day your core temperature rises and falls, and it is at its lowest around 4 to 6 in the morning. That low point is when alertness and performance are at their worst, which is why errors go up on night shifts. That is the effect the marked answer (low body temperature) is pointing at. The question should have said so, and I've now reworded it so it is clearly asking about the normal daily cycle. Thanks for pointing it out, and keep the reports coming.

PART66Online replied to filipninkovic2007's question ·8d ago

F

what about high temepture does this affect to

filipninkovic2007 asked a question ·9d ago

P

Thanks for raising this, you were right. The main job of the abradable lining is to let the blade tips run with minimum clearance and cut their own track without damage; the acoustic role is secondary. We have reworded the question and moved the correct answer to match.

PART66Online replied to alectaylorob's question ·12d ago

D

Per the EASA syllabus, the correct option is A, although the wording is loose. The study notes on this site describe the fan track liner as a sacrificial layer that the blade tips are designed to cut, so the tip is protected and the running clearance stays as small as the installation allows; they add that on many engines the same panel is perforated and honeycomb-backed, so it is also part of the sound-absorbing medium. Per Module 15.19 powerplant installation, the acoustic role is therefore secondary and the question should ask for the primary purpose; the full explanation is in the section The Abradable Lining in the Fan Case at part66online.com/study-notes/module/1...

Devraj_S replied to alectaylorob's question ·12d ago

P

Thanks for raising this, you were right that the wording was unclear. The question has now been reworded to: To inhibit the fuel system of an installed engine for storage, with inhibiting oil supplied to the fuel inlet, you should... The correct answer is unchanged (dry motor the engine), but the stem now makes it clear that this is about preserving the fuel system for storage, not priming it or clearing a wet start. Thanks again for reporting it.

PART66Online replied to alectaylorob's question ·13d ago

A

This answer isnt wrong but isnt its main purpose to provide tip clearance? I feel aiding in acoustics is no where as important?

alectaylorob asked a question ·13d ago

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