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. 86+ free simulations across 17 modules.
Mathematics
Arithmetic, algebra and geometry underpinning all maintenance theory.
Practise →Physics
Matter, mechanics, fluids, thermodynamics, optics and wave motion.
Practise →Electrical Fundamentals
DC theory, circuits, capacitance, magnetism and AC fundamentals.
Practise →Electronic Fundamentals
Semiconductors, printed circuit boards and servomechanisms.
Practise →Digital Techniques / Electronic Instrument Systems
Number systems, logic, data buses and electronic instruments.
Practise →Materials & Hardware
Ferrous/non-ferrous materials, composites, fasteners and pipes.
Practise →Maintenance Practices
Safety, tooling, fits and clearances, riveting and inspection.
Practise →Basic Aerodynamics
Atmosphere, aerofoils, lift, drag and flight stability.
Practise →Human Factors
Human performance, error, communication and safety culture.
Practise →Aviation Legislation
Regulatory framework, certification and continuing airworthiness.
Practise →Turbine Aeroplane Structures & Systems
Airframe structures, air conditioning, flight controls and systems (B1).
Practise →Helicopter Aerodynamics, Structures & Systems
Rotor theory, transmissions and rotary-wing systems.
Practise →Aircraft Aerodynamics, Structures & Systems
Avionics systems, autoflight, communications and instruments (B2).
Practise →Propulsion
Engines and engine control, engine indication, propellers, and starting and ignition (B2).
Practise →Gas Turbine Engine
Engine construction, fuel, air, starting and indicating systems.
Practise →Piston Engine
Reciprocating engines, fuel systems, induction and exhaust.
Practise →Propeller
Propeller construction, pitch control, synchronising and maintenance.
Practise →Ready for the full question banks and mock exams?
Every module, all 100+ simulations, the full question banks and timed mock exams at the official Appendix II lengths.