What EASA regulation provides guidance on determining affected areas during initial airworthiness and environmental protection?

Appendix D to GM 21.A.101 provides guidance for affected areas under the Initial Airworthiness and Environmental Protection (Regulation (EU) No 748/2012).

Can you give an example of affected and unaffected sub-areas when a passenger seat fitting is changed?

If a passenger seat fitting is changed, the structure of the seat is affected, requiring updated amendment levels for structural certification specifications. However, the seat fabric may not be affected, allowing the flammability certification basis to remain unchanged.

Appendix D to GM 21.A.101 Other guidance for affected areas

Q: Under EASA regulations, how do you determine if an area is affected by a change to a product?

An area is considered affected if the answer to any of the following questions is yes: Is the area changed from the identified baseline product? Is the area impacted by a significant product-level change? Is there a functional effect on the unchanged area by a change to the system or system function that it is a part of? Does the unchanged area need to comply with a system or product-level certification specification that is part of the change? Are the product-level characteristics affected by the change? Is the existing compliance for the area invalidated?

Q: According to EASA, what happens to sub-areas within an affected area that are not themselves affected by a change?

For sub-areas within an affected area that are not affected by a change, the amendment levels at the existing certification basis remain valid, along with the previous compliance findings.

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Appendix D to GM 21.A.101 Other guidance for affected areas

ED Decision 2017/024/R

D.1 Sample Questions in Determining Affected Areas.

Below are sample questions to assist in determining whether an area is affected by the change. If the answer to any of these questions is yes, then the area is considered to be affected.

1. Is the area changed from the identified baseline product?

2. Is the area impacted by a significant product-level change?

3. Is there a functional effect on the unchanged area by a change to the system or system function that it is a part of?

4. Does the unchanged area need to comply with a system or product-level certification specification that is part of the change?

5. Are the product-level characteristics affected by the change?

6. Is the existing compliance for the area invalidated?

D.2 Sub-Areas within an Affected Area.

Within areas affected by a change, there may be ‘sub-areas’ of the area that are not affected. For those sub-areas, the amendment levels at the existing certification basis remain valid, along with the previous compliance findings. For example, if a passenger seat fitting is changed as part of a significant change, then the structure of the seat is affected. Thus, the amendment level for CS 25.561 and CS 25.562, along with other applicable structural certification specifications, would be at the amendment level on the date of application (unless an exception is granted). However, the seat fabric is not affected, so the amendment level for CS 25.853 (flammability) may remain at the existing certification basis, and a new compliance finding would not be required.

Details

Source-Title: Appendix D to GM 21.A.101 Other guidance for affected areas

Erulesid: ERULES-1963177438-3716 Compare versions

Domain: Initial airworthiness

Regulatorysource: ED Decision 2017/024/R Navigate

Regulatorysubject: Part-21

Typeofcontent: GM to IR (Guidance material to implementing rule)

Origin: EASA

Category: EAR