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Complete written learning material for the theory behind all 17 basic-knowledge modules, organised the way the exam is: by EASA syllabus paragraph, for licence categories A, B1, B2, B2L and B3. One payment, 12 months of access to comprehensive notes for every module, the theory companion to your practice questions.
Module 3 — Electrical Fundamentals
A capacitor stores energy in an electric field between two conductive plates separated by an insulator (dielectric). Capacitors are found throughout aircraft systems — in power supply filtering, radio tuning circuits, timing circuits, and surge protection.
Module 3 — Electrical Fundamentals
Electricity can be generated by several different methods, each converting a different form of energy into electrical energy. Aircraft systems exploit many of these methods — from generators (magnetism) and thermocouples (heat) to piezoelectric sensors (pressure).
Module 3 — Electrical Fundamentals
This section defines the fundamental electrical quantities and their units. A clear understanding of voltage, current, resistance, and related concepts is essential before studying circuits, components, and systems in the remaining sections of Module 3.
Module 3 — Electrical Fundamentals
Static electricity deals with electric charges at rest, as opposed to current electricity where charges flow continuously. Static build-up on aircraft can damage sensitive electronics, cause radio interference, and even pose ignition hazards during refuelling.
Module 3 — Electrical Fundamentals
Electron theory explains the fundamental nature of electricity by examining atomic structure and the behaviour of electrons. This section lays the groundwork for understanding how electrical current flows and why different materials conduct electricity to different degrees.
The notes are written out in full, the way a good instructor would explain the topic, and every note can also play as narrated slides.
Switch between Read and Watch on note 3.9, Capacitance.
All 17 EASA Part-66 basic-knowledge modules, 296 notes, one for each syllabus paragraph. The first note of every module is free to read.
Module 1 · MathematicsAircraft maintenance licence candidates all sit a Module 1 exam covering arithmetic, algebra, geometry & trigonometry — without a calculator.6 notes · Arithmetic, Algebra, Geometry
Module 2 · PhysicsModule 2 covers the physics every aircraft maintenance engineer needs on the line: matter, mechanics, fluid behaviour, thermodynamics, optics and waves.8 notes · Matter, Mechanics, Thermodynamics and 2 more
Module 3 · Electrical FundamentalsModule 3 covers the electrical theory that underpins every system on a modern aircraft — from electron flow and Ohm's Law through DC and AC circuits, magnetism, transformers and motors.18 notes · Electrical Fundamentals, DC Circuits & Power, Capacitance, Magnetism & Inductance and 2 more
Module 4 · Electronic FundamentalsModule 4 covers the semiconductor devices, integrated circuits, printed circuit boards and servomechanisms that sit underneath every modern avionics box.5 notes · Diodes, Transistors, Integrated Circuits and 2 more
Module 5 · Digital Techniques / Electronic Instrument SystemsModule 5 covers the digital and avionics knowledge every B1, B2 and B3 engineer needs — numbering systems, logic gates, data buses, microprocessors, displays, ESDS handling, HIRF protection and typical glass-cockpit systems.15 notes · Electronic Instrument Systems, Numbering Systems, Data Conversion and 2 more
Module 6 · Materials and HardwareModule 6 covers the metals, composites, fasteners and hardware that hold an aircraft together — ferrous and non-ferrous alloys, corrosion, rivets, bolts, pipes, bearings and electrical cables.16 notes · Ferrous Materials, Non-Ferrous Materials, Composites & Corrosion and 2 more
Module 7 · Maintenance PracticesModule 7 covers the workshop and hangar skills every licensed engineer uses daily — safe working, hand and precision tools, riveting, electrical wiring, inspection methods and the documentation that turns hands-on work into a certified job.28 notes · Safety Precautions, Tools, Electrical Wiring (EWIS) and 2 more
Module 8 · Basic AerodynamicsModule 8 covers the physics of the atmosphere, how lift and drag are generated, the theory of flight and how aircraft remain stable about all three axes.5 notes · Physics of the Atmosphere, Aerodynamics, Theory of Flight and 1 more
Module 9 · Human FactorsEvery Part-66 licence category — A, B1, B2, B2L and B3 — sits a Module 9 paper covering how human performance, error, communication and teamwork shape aircraft maintenance safety.10 notes · Human Error & Just Culture, Human Performance & Limitations, Communication & Teamwork and 1 more
Module 10 · Aviation LegislationModule 10 of the EASA Part-66 syllabus covers the regulatory framework that governs aircraft maintenance in Europe — ICAO, EASA, Part-145, Part-M, Part-66 itself, occurrence reporting and the new cybersecurity section.10 notes · Regulatory Framework, Certifying Staff, Maintenance Organisations and 2 more
Module 11 · Aeroplane Aerodynamics, Structures and SystemsModule 11 covers everything from theory of flight and airframe construction to the ATA-chapter aircraft systems — hydraulics, pneumatics, electrical, flight controls, fuel, landing gear and avionics.54 notes · Theory of Flight, Airframe Structures, Hydraulics & Landing Gear and 2 more
Module 12 · Helicopter Aerodynamics, Structures and SystemsModule 12 is the helicopter-specific counterpart to Module 11, sat only by rotary-wing licence candidates. It covers rotor aerodynamics, swashplate and tail-rotor control, main gearbox and freewheel units, airframe construction and the systems that keep a helicopter airborne.22 notes · Rotary Wing Aerodynamics, Flight Control Systems, Transmissions and 2 more
Module 13 · Aircraft Aerodynamics, Structures and SystemsModule 13 is the B2 avionics omnibus — theory of flight, airframe structures, electrical power, autoflight, comms, navigation, instruments and integrated modular avionics in one 188-question paper.46 notes · Electrical Power, Instruments, Communication / Navigation and 2 more
Module 14 · PropulsionModule 14 covers turbine, piston, APU and electric/hybrid propulsion, plus engine indication, propellers, starting and ignition — sat by B2 and B2L avionics candidates.8 notes · Engines, Engine Control, Engine Indication and 2 more
Module 15 · Gas Turbine EngineModule 15 covers the gas turbine engine end-to-end — Brayton cycle theory, intake and compressor behaviour, combustion, the hot section, fuel and oil systems, indications, and ground operation.22 notes · Fundamentals & Performance, Intake & Compressor, Combustion Section and 2 more
Module 16 · Piston EngineModule 16 covers the fundamentals, performance, construction and systems of piston aeroplane engines — from four-stroke Otto theory to magneto ignition, carburettor icing and lubrication layouts.16 notes · Fundamentals, Performance & Induction, Fuel & Carburettors and 2 more
Module 17 · PropellerModule 17 covers propeller theory, construction, pitch control, synchronising, ice protection and maintenance — sat by piston-aeroplane and turboprop candidates (A1/A2, B1.1, B1.2, B3).7 notes · Fundamentals & Construction, Pitch Control, Synchronising and 2 more
Every module is broken down the same way as the official syllabus, one note per syllabus paragraph. Study in the order you will be examined, jump straight to a weak topic, and always know which syllabus reference you are looking at.
18 study notes, one per syllabus paragraph
Sample chapter scores. See every module's syllabus
The note for that syllabus paragraph, written out in full: worked examples in their own boxes, typeset formulas, diagrams and tables, and tip and warning callouts on what examiners catch people out on.
Switch to Watch and the note plays as narrated slides, section by section, each point lighting up as it is read out.
Every note opens its chapter drill: 10, 20 or 30 questions from that paragraph only, with a quiz subscription.
The Intelligent Progress Center reads how you answer, ranks your weakest syllabus chapters and links you straight to that chapter's note.
Online Access for 12 months, the offline PDF books to keep, or a licence for your training organisation.
Just €5.88 a module · no auto-renewal
Just €17.65 a module · yours to keep
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They are complete written learning material covering the theory of all 17 EASA Part66 modules, organised by EASA syllabus paragraph. They explain each topic in full — with worked examples, formulas, diagrams and exam tips — to prepare you for the aircraft maintenance licence exams in categories A, B1, B2, B2L and B3.
All 17 basic-knowledge modules are covered, across licence categories A, B1, B2, B2L and B3. You get every module in one purchase, so the notes work whichever category you are studying for.
Yes. The first paragraph of every one of the 17 modules is free to read, so you can see the real depth and style of the notes before deciding to buy. No payment is needed to preview.
Online Access (€99.99) lets you read all notes in your browser on any device, always kept up to date, and needs a free account. The Offline PDF (€299.99) is a downloadable ZIP holding one bookmarked, print-friendly PDF book per module — 17 books, 9,500+ pages — which you can study without internet and without an account. Online Access is one payment for 12 months of access; the Offline PDF is a one-time purchase that is yours to keep.
They serve different jobs. The study notes are where you learn the theory (one payment for 12 months of online access); the quiz subscription is where you practise exam-style questions. Many members use both — notes to understand each topic, questions to test that they are above the 75% pass mark.
Yes. The notes are written against the current EASA Part66 syllabus and maintained as the regulations change, so you are always studying the material that reflects the exam.
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