Free EASA Part-66 practice
Try Certify66 before you make an account. Every module below has interactive simulations and sample exam questions with explanations — open, playable, and completely free. 40+ free simulations across 17 modules.
Mathematics
Arithmetic, algebra and geometry underpinning all maintenance theory.
Practice free →Physics
Matter, mechanics, fluids, thermodynamics, optics and wave motion.
Practice free →Electrical Fundamentals
DC theory, circuits, capacitance, magnetism and AC fundamentals.
Practice free →Electronic Fundamentals
Semiconductors, printed circuit boards and servomechanisms.
Practice free →Digital Techniques / Electronic Instrument Systems
Number systems, logic, data buses and electronic instruments.
Practice free →Materials & Hardware
Ferrous/non-ferrous materials, composites, fasteners and pipes.
Practice free →Maintenance Practices
Safety, tooling, fits and clearances, riveting and inspection.
Practice free →Basic Aerodynamics
Atmosphere, aerofoils, lift, drag and flight stability.
Practice free →Human Factors
Human performance, error, communication and safety culture.
Practice free →Aviation Legislation
Regulatory framework, certification and continuing airworthiness.
Practice free →Turbine Aeroplane Structures & Systems
Airframe structures, air conditioning, flight controls and systems (B1).
Practice free →Helicopter Aerodynamics, Structures & Systems
Rotor theory, transmissions and rotary-wing systems.
Practice free →Aircraft Aerodynamics, Structures & Systems
Avionics systems, autoflight, communications and instruments (B2).
Practice free →Propulsion
Turbine engines, engine indication and electronic engine control (B2).
Practice free →Gas Turbine Engine
Engine construction, fuel, air, starting and indicating systems.
Practice free →Piston Engine
Reciprocating engines, fuel systems, induction and exhaust.
Practice free →Propeller
Propeller construction, pitch control, synchronising and maintenance.
Practice free →Ready for the full question banks and mock exams?
A free account unlocks progress tracking. Engineer unlocks every module, all 53+ simulations, the full question banks and timed mock exams at the official Appendix II lengths.