Part-21 including Part-26 Familiarization

Overview

A familiarization course on EASA Part-21 (Annex I to Regulation (EU) No 748/2012) — the initial-airworthiness rule that governs how aircraft, engines, propellers and parts are designed, certified, produced, released and identified, and who is approved to do it. Written for both non-technical and technical readers, it walks the airworthiness lifecycle and every Part-21 subpart — general provisions (A), type certificates (B), changes and STCs (D, E), production and the POA (F, G), certificates of airworthiness and noise (H, I), design organisations and the DOA (J), parts, repairs and identification (K, M, Q), ETSO authorisations (O) and permits to fly (P) — then covers the Certification Specifications (CS) and CS-ETSO, the Section B authority procedures and Part-21 Light, what Commission Implementing Regulation (EU) 2026/100 changes, and Part-26 (Regulation (EU) 2015/640), the additional retroactive airworthiness specifications for in-service aircraft. Regulations are cited by paragraph number throughout.

Course content is maintained against the latest applicable regulatory amendments reviewed as of 21 June 2026.

Syllabus

15 modules, completed in order — each with its keywords and objective.

1. 1

   Welcome and course scope

   scopeaudiencestructureassessment

   Objective: Orient to the Part-21 familiarization scope and assessment.

2. 2

   The regulatory map - where Part-21 sits

   748/2012initial airworthinessregulatory map

   Objective: Place Part-21 within the initial-airworthiness regulatory map.

3. 3

   The airworthiness lifecycle at a glance

   designproductioncertificationreleaselifecycle

   Objective: Describe the airworthiness lifecycle from design to release.

4. 4

   Subpart A - the general provisions every holder shares

   Subpart Ageneral provisionsobligationsmarking

   Objective: Explain the Subpart A general provisions shared by all holders.

5. 5

   Subpart B - type certificates

   type certificateTCtype designcertification basis

   Objective: Describe how type certificates are obtained under Subpart B.

6. 6

   Subparts D and E - changes and supplemental type certificates

   changesSTCmajor/minorSubpart D/E

   Objective: Distinguish changes and STCs under Subparts D and E.

7. 7

   Subparts F and G - production and the POA

   productionPOASubpart F/Gconformity

   Objective: Explain production under Subpart F and the POA under Subpart G.

8. 8

   Subpart J - design organisations (DOA)

   DOAdesign organisationprivilegesSubpart J

   Objective: Describe the design organisation approval under Subpart J.

9. 9

   Subparts H and I - certificates of airworthiness and noise

   CofAnoise certificateSubpart H/IARC

   Objective: Explain certificates of airworthiness and noise under Subparts H and I.

10. 10

    Subparts K, M and Q - parts, repairs and identification

    partsrepairsidentificationSubpart K/M/QForm 1

    Objective: Describe parts, repairs and identification under Subparts K, M and Q.

11. 11

    Subpart O - ETSO authorisations

    ETSOarticlesauthorisationSubpart O

    Objective: Explain ETSO authorisations under Subpart O.

12. 12

    Certification Specifications and permits to fly

    CSCS-ETSOpermit to flySubpart P

    Objective: Relate the Certification Specifications and permits to fly to Part-21.

13. 13

    Section B, Part-21 Light and what 2026/100 changes

    Section BPart-21 Light2026/100authority procedures

    Objective: Summarise Section B, Part-21 Light and the 2026/100 changes.

14. 14

    Part-26 - additional airworthiness specifications

    Part-262015/640retroactivein-service

    Objective: Explain Part-26 additional airworthiness specifications for in-service aircraft.

15. 15

    Summary, document map and citation discipline

    summarydocument mapcitationparagraph numbers

    Objective: Consolidate the document map and apply citation discipline.

Final assessment

• Format: 12 multiple-choice questions drawn from the course question bank, with the options shuffled each attempt.
• Pass mark: 75%.
• Certificate: issued automatically on passing, according to Regulation (EU) No 748/2012, Annex I (Part-21), as amended through Commission Implementing Regulation (EU) 2026/100; with EASA Certification Specifications (CS) and CS-ETSO, and Part-26 to Regulation (EU) 2015/640.