EASA Part 66 Modules: The Complete Syllabus Guide

Master the EASA Part 66 modules with this complete syllabus breakdown. Get clear, practical insights for every module and discover the core topics you need to know to start your aircraft maintenance career.

Module 1: Mathematics

Arithmetic: Basic operations, fractions, decimals, ratios, proportions, and averages.
Algebra: Simple equations, indices, powers, logarithms, and simultaneous equations.
Geometry: Trigonometric relationships, coordinates, area/volume calculations, and geometric constructions.

Module 2: Physics

Matter: Nature of matter, chemical elements, molecules, and states of matter.
Mechanics: Statics, kinetics, dynamics, gyroscopic principles, and fluid dynamics (specific gravity, viscosity).
Thermodynamics: Temperature scales, heat transfer, and the fundamental laws of thermodynamics.
Optics (Light): Reflection, refraction, lenses, and the basic principles of fiber optics.
Wave Motion and Sound: Wave propagation, speed of sound, Doppler effect, and the foundations of ultrasonic testing.

Module 3: Electrical Fundamentals

Electron Theory & Static Electricity: Atomic structure, electrical conduction, and static charge distribution.
DC Circuits & Batteries: Resistance, Ohm’s Law, Kirchhoff’s Laws, power calculations, and detailed maintenance/hazards of Lead-Acid and Ni-Cd batteries.
Capacitance & Inductance: The behavior of capacitors and inductors in both DC and AC circuits, including time constants.
Magnetism: Electromagnetism, magnetic circuits, and core motor/generator theory.
AC Theory: Purely resistive, capacitive, and inductive circuits, including phase relationships and resonance.
Transformers & Filters: Voltage transformation, power losses, and low/high/band-pass signal processing.
AC Machines: The practical operation of single-phase/polyphase AC generators and synchronous/induction motors.

Module 4: Electronic Fundamentals

Semiconductors: Diodes, Zener diodes, bipolar junction transistors (BJTs), Field Effect Transistors (FETs), and Integrated Circuits (ICs).
Printed Circuit Boards (PCBs): Construction, usage, handling precautions, and maintenance.
Servomechanisms: Open and closed-loop systems, feedback mechanisms, analog transducers, synchros, and resolvers.

Module 5: Digital Techniques / Electronic Instrument Systems

Numbering Systems & Logic Circuits: Binary, octal, and hexadecimal systems, plus core logic gate operations (AND, OR, NAND, NOR).
Electronic Systems: Integrated Modular Avionics (IMA) and Data Buses (ARINC 429, ARINC 629, MIL-STD-1553).
Computing: Basic computer structure (RAM/ROM), microprocessors, and multiplexing.
Fiber Optics: Data transmission, handling, bend radii, and termination of fiber optic cables.
Displays: CRT, LED, LCD, and aircraft display systems (EFIS, EICAS, ECAM).
Safety & Control: Electrostatic Sensitive Devices (ESD) handling, software management control, and Electromagnetic Environment (HIRF/Lightning protection).

Module 6: Materials & Hardware

Aircraft Materials: Properties and testing of ferrous, non-ferrous, composite, and non-metallic materials (plastics, rubbers, sealants).
Corrosion: Identification of different types (galvanic, pitting, fretting), removal, and chemical/physical protection.
Fasteners: Screws, bolts, studs, aviation rivets (solid and blind), and mechanical solid locking devices.
Mechanical Components: Pipes, unions, springs, bearings, and flight control transmissions (cables, pulleys, turnbuckles).
Electrical Hardware: Cables, wire types, crimping, connectors, and loom routing/identification.

Module 7: Maintenance Practices

Safety: Workshop, flight line, and aircraft-specific safety precautions (fire, hazardous substances, rotating equipment).
Workshop Skills: Proper hand tool usage, reading engineering drawings (ATA 100), and calibration standards.
Fits and Clearances: Drill sizes, interference fits, limits, tolerances, bowing, and twist measurements.
Non-Destructive Testing (NDT): Dye penetrant, ultrasonic, eddy current, magnetic particle, and radiographic testing.
Welding, Brazing, and Soldering: Techniques, inspection standards, and bonding practices.
Specialized Tasks: EWIS (Electrical Wiring Interconnection System) practices, riveting procedures, and material handling.
On-Aircraft Tasks: Weight and balance center of gravity calculations, aircraft handling (towing/jacking), storage, and disassembly/assembly.
Abnormal Events: Structural inspection following lightning strikes, heavy landings, flight through turbulence, or HIRF interference.

Module 8: Basic Aerodynamics

Physics of the Atmosphere: Composition of air, gas laws, and understanding the International Standard Atmosphere (ISA).
Aerodynamics: Airflow properties, boundary layer, lift generation, types of drag, and wing shapes/aspect ratios.
Theory of Flight: Flight stability (active and passive), dynamics, and primary/secondary control surfaces.
High-Speed Flight: Mach number, critical Mach, shock waves, sweepback, and compressibility effects.

Module 9: Human Factors

Performance: Physical and mental limitations of the maintenance technician, including vision, hearing, and information processing.
Social Psychology: Teamwork, leadership, peer pressure, and effective shift communication/handovers.
Environment: The physiological impact of noise, fumes, lighting, vibration, and temperature on task performance.
Error Management: Identifying the “Dirty Dozen,” understanding the Swiss Cheese Model, risk mitigation, and proactive safety management.

Module 10: Aviation Legislation

Regulatory Framework: The hierarchy and roles of ICAO, EASA, and Member State National Aviation Authorities.
Organizations: Part-147 (Training Organizations), Part-145 (Maintenance Organizations), and Part-21 (Design and Production).
Certifying Staff: EASA Part-66 licensing categories, type ratings, and continuation training requirements.
Continuing Airworthiness: Part-M, Part-CAMO, Part-ML, Airworthiness Directives (ADs), Service Bulletins (SBs), and certification of aircraft/components.
Modern Challenges: Cybersecurity protocols and data protection in aviation maintenance environments.

Module 11: Aeroplane Aerodynamics, Structures and Systems

Theory of Flight: Fixed-wing specific principles, high lift devices, and boundary layer control (11A Turbine / 11B Piston).
Structures: Fail-safe, safe-life, and damage tolerance concepts. Construction of fuselage, wings, stabilizers, and flight control attachments.
Standard ATA Chapter Systems: Deep dive into Air Conditioning & Pressurization (ATA 21), Electrical Power (ATA 24), Fire Protection (ATA 26), Flight Controls (ATA 27), Fuel (ATA 28), Hydraulics (ATA 29), Ice/Rain Protection (ATA 30), Landing Gear (ATA 32), Oxygen (ATA 35), and Pneumatics (ATA 36).
Cabin Systems: Water/waste management (ATA 38) and cabin entertainment/communication networks (ATA 44).
Modern Tech: Integrated Modular Avionics (IMA), On-board Maintenance Systems (OMS), and Central Maintenance Computers (CMC).

Module 12: Helicopter Aerodynamics, Structures and Systems

Rotary Wing Theory: Autorotation, retreating blade stall, ground effect, and gyroscopic precession.
Dynamic Components: Main rotor heads, tail rotors, blade tracking, transmission gearboxes, and vibration analysis (track and balance).
Structures & Systems: Helicopter-specific flight controls (cyclic, collective), skids/floats, and unique airframe layouts.

Module 13: Aircraft Aerodynamics, Structures and Systems (Avionic)

Autoflight (ATA 22): Autopilot loops, flight director system logic, autothrottle, and automatic landing systems.
Communication & Navigation (ATA 23/34): VHF, HF, SATCOM, ILS, VOR, ADF, GPS, Weather Radar, TCAS, and GPWS operations.
Avionic Integration: Detailed electronic study of the systems listed in Module 11, focusing on sensors, computers, and data bus communication.
Software Management: Field Loadable Software (FLS) updating and verification procedures.

Module 14: Propulsion

Engine Foundations: Core principles of turbine, APU, piston, electric, and hybrid propulsion systems and their airframe interfaces.
Control Systems (EEC/FADEC): The electronic interface between the engine and the airframe, fuel metering control, and thrust management.
Indication (ATA 77): Electronic engine monitoring (EGT, EPR, N1/N2/N3 rpm), vibration monitoring, and flight deck primary/secondary display systems.

Module 15: Gas Turbines

Fundamentals: Engine cycles (Brayton), performance metrics, thermodynamics, and thrust/propulsive efficiency.
Sections: Inlet cowls, centrifugal/axial compressors, combustion chambers, high/low-pressure turbines, and exhaust/thrust reverser systems.
Systems: Lubrication (ATA 79), fuel and control (ATA 73), internal air sealing/cooling, and starting/ignition (ATA 80/81).
Engine Control Systems: Full Authority Digital Engine Control (FADEC) architecture and protective logic, explicitly including Thrust Control Malfunction Accommodation (TCMA) and overspeed protection.
Operation: Condition monitoring, boroscope inspections, ground running procedures, power checks, and long-term preservation.

Module 16: Piston Engines

Construction: Fundamentals of 2-stroke/4-stroke internal combustion, engine blocks, cylinders, pistons, and valve mechanisms.
Systems: Float chamber carburetors, fuel injection, lubrication, starting/ignition (magnetos), and supercharging/turbocharging.
Maintenance: Overhaul practices, top-end inspections, engine removal/installation, and ground testing troubleshooting.

Module 17: Propellers

Construction: Wood, metal, and composite blade manufacturing, aerodynamic forces, and slipstream effects.
Control: Constant-speed pitch control mechanisms, feathering, reverse pitch, and synchronization/synchrophasing.
Maintenance: Static and dynamic propeller balancing, electrical/fluid de-icing systems, and preservation/storage procedures.