AppendixAppendix
Appendix B to GM 21L.A.63Classification of changes to a type certificate
The following tables provide examples of ‘substantial’ changes. The classification may change due to cumulative effects and/or combinations of individual changes. A.1 Examples of ‘substantial’ changes for small aeroplanes (CS-23) A.1.1 Table A-1 contains examples of changes that are ‘substantial’ for small aeroplanes (CS-23).
Table A-1 — Examples of ‘substantial’ changes for small aeroplanes (CS-23)
| Example | Description of change | Notes |
|---|---|---|
| 1. | Change to wing location (tandem, forward, canard, high/low). | Proposed change to the design is so extensive that a substantially complete investigation of compliance with the applicable type-certification basis is required. |
| 2. | Fixed wing to tilt wing. | Proposed change to the design is so extensive that a substantially complete investigation of compliance with the applicable type-certification basis is required. |
| 3. | A change to the number of engines. | Proposed change to the design is so extensive that a substantially complete investigation of compliance with the applicable type-certification basis is required. |
| 4. | Replacement of piston or turboprop engines with turbojet or turbofan engines. | Proposed change to the design is so extensive that a substantially complete investigation of compliance with the applicable type-certification basis is required. |
| 5. | Change to engine configuration (tractor/pusher). | Proposed change to the design is so extensive that a substantially complete investigation of compliance with the applicable type-certification basis is required. |
| 6. | Change from an all-metal to all-composite aeroplane. | Proposed change to the design is so extensive that a substantially complete investigation of compliance with the applicable type-certification basis is required. |
A.2 Examples of ‘substantial’ changes for rotorcraft (CS-27) A.2.1 Table A-2 contains examples of changes that are ‘substantial’ for rotorcraft (CS-27).
Table A-2 — Examples of ‘substantial’ changes for rotorcraft (CS-27)
| Example | Description of change | Notes |
|---|---|---|
| 1. | Change to the number and/or configuration of rotors (e.g. main and tail rotor system to two main rotors). | Proposed change to the design is so extensive that a substantially complete investigation of compliance with the applicable type-certification basis is required. |
| 2. | Change from an all-metal rotorcraft to all-composite rotorcraft. | Proposed change to the design is so extensive that a substantially complete investigation of compliance with the applicable type-certification basis is required. |
A.3 Examples of ‘substantial’ changes for propellers (CS-P) A.3.1 Table A-3 contains an example of a change that is ‘substantial’ for propellers (CS-P).
Table A-3 — Example of a ‘substantial’ change for propellers (CS-P)
| Example | Description of change | Notes |
|---|---|---|
| 1. | Change to the number of blades. | Proposed change to the design is so extensive that a substantially complete investigation of compliance with the applicable type-certification basis is required. |
APPENDIX · Appendix B to GM 21L.A.63 — Regulation (EU) No 748/2012 · ED Decision 2023/013/R · Initial Airworthiness Easy Access Rules · EAR revision 27 Nov 2025