IRImplementing rule
2. Modularisation
Qualification on basic subjects for each aircraft maintenance licence category or subcategory shall be in accordance with the following matrix, where applicable subjects are indicated by an ‘X’, while ‘n/a’ means that the subject module is neither applicable nor required.
| Subject module | B1.1 A1 | B1.2 A2 | B1.3 A3 | B1.4 A4 | B3 | B2 | B2L | C |
|---|---|---|---|---|---|---|---|---|
| Turbine engine | Piston engine | Turbine engine | Piston engine | Piston-engine nonpressurised aeroplanes MTOM ≤ 2 t | ||||
| 1. MATHEMATICS | X | X | X | X | X | X | X | X |
| 2. PHYSICS | X | X | X | X | X | X | X | X |
| 3. ELECTRICAL FUNDAMENTALS | X | X | X | X | X | X | X | X |
| 4. ELECTRONICS FUNDAMENTALS | X (n/a for A1) | X (n/a for A2) | X (n/a for A3) | X (n/a for A4) | X | X | X | X |
| 5. DIGITAL TECHNIQUES/ELECTR-ONIC INSTRUMENT SYSTEMS | X | X | X | X | X | X | X | X |
| 6. MATERIALS AND HARDWARE | X | X | X | X | X | X | X | X |
| 7. MAINTENANCE PRACTICES | X | X | X | X | X | X | X | X |
| 8. BASIC AERODYNAMICS | X | X | X | X | X | X | X | X |
| 9. HUMAN FACTORS | X | X | X | X | X | X | X | X |
| 10. AVIATION LEGISLATION | X | X | X | X | X | X | X | X |
| 11. AEROPLANE AERODYNAMICS, STRUCTURES AND SYSTEMS | X | X | n/a | n/a | X | n/a | n/a | 11, 15 & 17 as B1.1 or 11, 16 & 17 as B1.2 or 12 & 15 as B1.3 or 12 & 16 as B1.4 or 13 & 14 as B2 |
| 12. HELICOPTER AERODYNAMICS, STRUCTURES AND SYSTEMS | n/a | n/a | X | X | n/a | n/a | n/a | |
| 13. AIRCRAFT AERODYNAMICS, STRUCTURES AND SYSTEMS | n/a | n/a | n/a | n/a | n/a | X | X | |
| 14. PROPULSION | n/a | n/a | n/a | n/a | n/a | X | X | |
| 15. GAS TURBINE ENGINES | X | n/a | X | n/a | n/a | n/a | n/a | |
| 16. PISTON ENGINE | n/a | X | n/a | X | X | n/a | n/a | |
| 17. PROPELLER | X | X | n/a | n/a | X | n/a | n/a |
IR — Regulation (EU) No 1321/2014 · Regulation (EU) 2023/989 · Continuing Airworthiness Easy Access Rules · EAR revision 2 Sep 2025