ED Decision 2023/013/R
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. |
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