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

Available versions for ERULES-1963177438-3716

ED Decision 2017/024/R found in: Initial Airworthiness and Environmental Protection (No 748/2012) Part-21 Part-21L (Jul 2024)

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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.