--- title: "3.1 – 4.2: APPENDICES TO ANNEX III (Part-66) (Part-66) — rule index · Avioverse" description: "3.1 – 4.2, Regulation (EU) No 1321/2014. Basic knowledge for categories A, B1, B2, B2L and B3 is indicated by knowledge levels (1, 2 or 3) of each…" url: "https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66" --- # APPENDICES TO ANNEX III (Part-66) Annex III (Part-66) · Continuing Airworthiness · Regulation (EU) No 1321/2014 · 3.1 – 4.2 On this page 1. ## [Appendix I Basic Knowledge Requirements (except for category L licence)](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/appendix-i) Appendix I — Basic Knowledge Requirements (except for category L licence) 2. ## [1. Knowledge levels for category A, B1, B2, B2L, B3 and C aircraft maintenance licences](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/1-knowledge-levels-for-category-a-b1-b2-b2l-b3-and-c-aircraft-maintenance) Basic knowledge for categories A, B1, B2, B2L and B3 is indicated by knowledge levels (1, 2 or 3) of each applicable subject. 3. ## [2. Modularisation](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/2-modularisation) Qualification on basic subjects for each aircraft maintenance licence category or subcategory shall be in accordance with the following matrix, where… 4. ## [MODULE 1. MATHEMATICS](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-1-mathematics) MODULE 1. MATHEMATICS LEVEL A B1 B2 B2L B3 1.1 Arithmetic 1 2 1.2 Algebra (a) Simple algebraic expressions; 5. ## [MODULE 2. PHYSICS](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-2-physics) MODULE 2. PHYSICS LEVEL A B3 B1 B2 B2L 2.1 Matter 1 2 2.2. Mechanics 2.2.1 Statics 1 2 2.2.2 Kinetics 1 2 2.2.3 Dynamics (a) Mass, force and energy; 6. ## [MODULE 3. ELECTRICAL FUNDAMENTALS](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-3-electrical-fundamentals) MODULE 3. ELECTRICAL FUNDAMENTALS LEVEL A B1 B2 B2L B3 3.1 Electron theory 1 1 1 3.2 Static electricity and conduction 1 2 1 3.3 Electrical terminology 1… 7. ## [MODULE 4. ELECTRONIC FUNDAMENTALS](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-4-electronic-fundamentals) MODULE 4. ELECTRONICS FUNDAMENTALS LEVEL A B1 B3 B2 B2L 4.1 Semiconductors 4.1.1 Diodes (a) Description and characteristics; 8. ## [MODULE 5. DIGITAL TECHNIQUES/ELECTRONIC INSTRUMENT SYSTEMS](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-5-digital-techniques-electronic-instrument-systems) MODULE 5. DIGITAL TECHNIQUES/ELECTRONIC INSTRUMENT SYSTEMS LEVEL A B3 B1 B2 B2L 5.1 Electronic instrument systems 1 1 1 1 5.2 Numbering systems — — 1 2… 9. ## [MODULE 6. MATERIALS AND HARDWARE](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-6-materials-and-hardware) MODULE 6. MATERIALS AND HARDWARE LEVEL A B1 B3 B2 B2L 6.1 Aircraft materials — ferrous (a) Alloy steels used in aircraft; 10. ## [MODULE 7. MAINTENANCE PRACTICES](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-7-maintenance-practices) MODULE 7. MAINTENANCE PRACTICES LEVEL A B1 B3 B2 B2L 7.1 Safety precautions – aircraft and workshop 3 3 3 7.2 Workshop practices 3 3 3 7.3 Tools 3 3 3… 11. ## [MODULE 8. BASIC AERODYNAMICS](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-8-basic-aerodynamics) MODULE 8. BASIC AERODYNAMICS LEVEL A B3 B1 B2 B2L 8.1 Physics of the atmosphere 1 2 International Standard Atmosphere (ISA), application to aerodynamics. 12. ## [MODULE 9. HUMAN FACTORS](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-9-human-factors) MODULE 9. HUMAN FACTORS LEVEL ALL 9.1 General 2 9.2 Human performance and limitations 2 9.3 Social psychology 1 9.4 Factors that affect performance 2 9.5… 13. ## [MODULE 10. AVIATION LEGISLATION](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-10-aviation-legislation) MODULE 10. AVIATION LEGISLATION LEVEL A B1 B2 B2L B3 10.1 Regulatory framework 1 1 10.2 Certifying Staff — maintenance 2 2 10.3 Approved maintenance… 14. ## [MODULE 11. AEROPLANE AERODYNAMICS, STRUCTURES AND SYSTEMS](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-11-aeroplane-aerodynamics-structures-and-systems) MODULE 11. TURBINE AEROPLANE AERODYNAMICS, STRUCTURES AND SYSTEMS (Appendix I to Part-66) MODULE 11. 15. ## [MODULE 12. HELICOPTER AERODYNAMICS, STRUCTURES AND SYSTEMS](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-12-helicopter-aerodynamics-structures-and-systems) MODULE 12. HELICOPTER AERODYNAMICS, STRUCTURES AND SYSTEMS LEVEL A3 A4 B1.3 B1.4 12.1 Theory of flight — rotary wing aerodynamics 1 2 12.2 Flight control… 16. ## [MODULE 13. AIRCRAFT AERODYNAMICS, STRUCTURES AND SYSTEMS](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-13-aircraft-aerodynamics-structures-and-systems) C/N: Communication & Navigation; Ins.: Instruments; A/F: Autoflight; 17. ## [MODULE 14. PROPULSION](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-14-propulsion) MODULE 14. PROPULSION LEVEL B2 B2L Instruments B2L Airframe \& 18. ## [MODULE 15. GAS TURBINE ENGINE](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-15-gas-turbine-engine) MODULE 15. GAS TURBINE ENGINE LEVEL A1 A3 B1.1 B1.3 15.1 Fundamentals 1 2 15.2 Engine performance — 2 15.3 Inlet 2 2 15.4 Compressors 1 2 15.5 Combustion… 19. ## [MODULE 16. PISTON ENGINE](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-16-piston-engine) MODULE 16. PISTON ENGINE LEVEL A2 A4 B1.2 B1.4 B3 16.1 Fundamentals 1 2 16.2 Engine performance 1 2 16.3 Engine construction 1 2 16.4 Engine fuel systems… 20. ## [MODULE 17. PROPELLER](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-17-propeller) (Appendix I to Part-66) MODULE 17. PROPELLER LEVEL A1 A2 B1.1 B1.2 B1.E B3 17.1 Fundamentals 1 2 17.2 Propeller construction 1 2 17.3 Propeller pitch… 21. ## [MODULE 18. ELECTRIC POWER PLANT](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/module-18-electric-power-plant) MODULE 18. ELECTRIC POWER PLANT LEVEL B1.E 18.1 Fundamentals 3 18.2 Engine performance 3 18.3 Engine construction 3 18.4 Electric energy system 3 18.4.1… 22. ## [3. Basic training methods](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/3-basic-training-methods) An appropriate training method, or combination of methods, shall be determined for the entire course or for each of its modules or submodules, with… 23. ## [AMC1 Appendix I — Basic Knowledge Requirements (except for category L licence) Section 2](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/amc1-appendix-i-basic-knowledge-requirements-except-for-category-l-licence) MODULARISATION MODULE 1 — MATHEMATICS MODULE 1 — MATHEMATICS LEVEL A1 A2 A3 A4 B1 B2 B2L B3 1.1 Arithmetic 1 2 Arithmetical terms and signs, methods of… 24. ## [AMC1 Appendix I — Basic Knowledge Requirements (except for category L licence) Section 3](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/amc1-appendix-i-basic-knowledge-requirements-except-for-category-l-licence-2) Basic training methods Training methods are categorised as follows: 25. ## [Appendix II Basic examination standard (except for category L licence)](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/appendix-ii) Appendix II — Basic examination standard (except for category L licence) 26. ## [1. General](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/1-general) 1.1. All basic examinations shall be carried out using the multi-choice question format and essay questions as specified below. 27. ## [2. Number of questions per module](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/2-number-of-questions-per-module) 2.1. MODULE 1 – MATHEMATICS Category A: 16 multiple-choice, no essay questions. 28. ## [AMC1 Appendix II — Basic examination standard (except for category L licence)](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/amc1-appendix-ii-basic-examination-standard-except-for-category-l-licence) The tables below show the acceptable number of questions for the submodules. 29. ## [Appendix III Aircraft type training and type evaluation standard – on-the-job training (OJT)](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/appendix-iii) Appendix III Aircraft type training and type evaluation standard – on-the-job training (OJT) 30. ## [1. General](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/1-general-2) Aircraft type training shall consist of theoretical training and examination, and, except for the category C ratings, practical training and assessment. 31. ## [2. Aircraft type training levels](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/2-aircraft-type-training-levels) The three levels listed below define the objectives, the depth of training and the level of knowledge that the training is intended to achieve. 32. ## [3. Aircraft type training standard](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/3-aircraft-type-training-standard) Although aircraft type training includes both theoretical and practical elements, courses can be approved for the theoretical element, the practical… 33. ## [3.1 Theoretical element](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/3-1) Objective: On completion of a theoretical training course the student shall be able to demonstrate, to the levels identified in the Appendix III… 34. ## [3.2 Practical element](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/3-2) Objective: The objective of practical training is to gain the required competence in performing safe maintenance, inspections and routine work according… 35. ## [4. Type training examination and assessment standard](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/4-type-training-examination-and-assessment-standard) Type training examination and assessment standard 36. ## [4.1 Theoretical element examination standard](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/4-1) After the theoretical portion of the aircraft type training has been completed, a written examination shall be performed, which shall comply with the… 37. ## [4.2 Practical element assessment standard](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/4-2) After the practical element of the aircraft type training has been completed, an assessment must be performed, which must comply with the following: 38. ## [5. Type evaluation standard for Group 2 and Group 3 aircraft](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/5-type-evaluation-standard-for-group-2-and-group-3-aircraft) Type evaluation relative to aircraft of Group 2 or Group 3 shall be conducted by training organisations appropriately approved in accordance with Annex… 39. ## [6. On-the-job training (OJT)](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/6-on-the-job-training-ojt) 6.1 General The OJT is the training that the applicant is given on a particular aircraft type in a real workplace, having the possibility to learn… 40. ## [AMC to Appendix III to Part-66 ‘Aircraft Type Training and Examination Standard. On-the-Job Training’](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/amc-to-appendix-iii-to-part-66-aircraft-type-training-and-examination-standard) Aircraft Type Training and On-the-Job Training The theoretical and practical training providers, as well as the OJT provider, may contract the services… 41. ## [AMC1 Appendix III Aircraft type training and type evaluation standard — on-the-job training (OJT) Section 1](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/amc1-appendix-iii-aircraft-type-training-and-type-evaluation-standard-on-the-job) Aircraft Type Training 1. Aircraft type training may be sub-divided in airframe and/or powerplant and/or avionics/electrical systems type training courses. 42. ## [AMC to Paragraphs 1(b), 3.2 and 4.2 of Appendix III to Part-66 ‘Aircraft Type Training and Examination Standard. On-the-Job Training’](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/amc-to-paragraphs-1-b-3-2-and-4-2-of-appendix-iii-to-part-66-aircraft-type) Practical Element of the Aircraft Type Training 1. The practical training may include instruction in a classroom or in simulators but part of the… 43. ## [AMC to Paragraph 1(c) of Appendix III to Part-66 ‘Aircraft Type Training and Examination Standard. On-the-Job Training’](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/amc-to-paragraph-1-c-of-appendix-iii-to-part-66-aircraft-type-training-and) Differences Training Approved difference training is not required for different variants within the same aircraft type rating (as specified in Appendix I… 44. ## [GM1 Appendix III Aircraft type training and type evaluation standard — on-the-job training (OJT) Section 1(c)](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/gm1-appendix-iii-aircraft-type-training-and-type-evaluation-standard-on-the-job) DIFFERENCES TRAINING If the holder of a B1 and B2 licence, without any type rating, successfully completes a combined type training course (B1 + B2)… 45. ## [AMC1 Appendix III Aircraft type training and type evaluation standard — on-the-job training (OJT) Section 3](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/amc1-appendix-iii-aircraft-type-training-and-type-evaluation-standard-on-the-job-2) AIRCRAFT TYPE TRAINING STANDARD Training methods are categorised as ‘instructor-centred’, ‘student-centred’ and ‘blended training’. 46. ## [AMC1 Appendix III Aircraft type training and type evaluation – on-the-job training (OJT) Section 3.1(d)](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/amc1-appendix-iii-aircraft-type-training-and-type-evaluation-on-the-job-training) Training needs analysis (TNA) for the theoretical element of the aircraft type training 1. 47. ## [AMC1 Appendix III Aircraft type training and type evaluation standard — on-the-job training (OJT) Section 4.1](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/amc1-appendix-iii-aircraft-type-training-and-type-evaluation-standard-on-the-job-3) Type training examination and assessment standard 4.1 Theoretical element examination standard Examinations may be computer or paper based, or a… 48. ## [AMC to Section 5 of Appendix III to Part-66 ‘Aircraft Type Training and Examination Standard. On-the-Job Training’](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/amc-to-section-5-of-appendix-iii-to-part-66-aircraft-type-training-and) Type Examination Standard This Section 5 ‘Type Examination Standard’ does not apply to the examination performed as part of type training. 49. ## [AMC1 Appendix III Aircraft type training and type evaluation standard — on-the-job training (OJT) Section 6](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/amc1-appendix-iii-aircraft-type-training-and-type-evaluation-standard-on-the-job-4) On-the-job training (OJT) General ‘Maintenance organisations appropriately approved according to this Regulation for the maintenance of that aircraft… 50. ## [Appendix IV Experience and basic knowledge modules or partial modules required for extending an aircraft maintenance licence under Annex III (Part-66)](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/appendix-iv) Experience requirements Table A below shows the experience requirements, in months, for adding a new category or subcategory to a licence granted in… 51. ## [Appendix V Application Form — EASA Form 19](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/appendix-v) This Appendix contains an example of the form used for applying for the aircraft maintenance licence referred to in Annex III (Part-66). 52. ## [Appendix VI Aircraft Maintenance Licence referred to in Annex III (Part-66) — EASA Form 26](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/appendix-vi) An example of the aircraft maintenance licence referred to in Annex III (Part-66) can be found on the following pages. 53. ## [Appendix VII Basic knowledge requirements for category L aircraft maintenance licence](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/appendix-vii) The definitions of the different levels of knowledge required in this Appendix are the same as those set out in point 1 of Appendix I. 54. ## [AMC1 Appendix VII Basic knowledge requirements for category L aircraft maintenance licence](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/amc1-appendix-vii-basic-knowledge-requirements-for-category-l-aircraft) MODULE 1L — BASIC KNOWLEDGE MODULE 1L — BASIC KNOWLEDGE Level 1L.1 Mathematics Arithmetic: 55. ## [Appendix VIII Basic examination standard for category L aircraft maintenance licence](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/appendix-viii) The standardisation basis for examinations related to the Appendix VII basic knowledge requirements shall be as follows: 56. ## [AMC1 Appendix VIII — Basic examination standard for category L aircraft maintenance licence](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/amc1-appendix-viii-basic-examination-standard-for-category-l-aircraft) NUMBER OF QUESTIONS PER SUBMODULE The tables below show the number of questions recommended for each submodule. 57. ## [Appendix IX Assessment method for the multimedia-based training (MBT)](https://avioverse.aero/regulations/easa/continuing-airworthiness/part-66/appendices-to-annex-iii-part-66/appendix-ix) The purpose of this Appendix is to establish the requirements for the assessment and approval by a competent authority of any course that includes MBT in… Consolidated from the EASA Easy Access Rules (revision 2 Sep 2025, extracted 13 Oct 2026) for convenience. 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