Many thanks to Hatrack....

Many thanks to Hatrack. https://www.faa.gov/sites/faa.gov/files/FAA_SEI_list_EU_products_Rev5.pdf

On PAGE 5.

Fatigue and Damage

Tolerance

25.571,

25.1529,

Appendix H

SEI Applicable only to new TC and changes classified as significant under 14 CFR

21.101. The showing of compliance with fatigue and damage tolerance

requirements is a complex task, with many issues to be considered, and with

various possible compliance approaches, in particular for new TCs, amended

TCs (derivative airplane/model) or significant STCs (such as passenger to

freighter conversions). This includes compliance approaches to address new

inspection methods (e.g., structural health monitoring systems, such as

comparative vacuum monitoring), establish inspection programs based on an

initial flaw, and develop full-scale fatigue test evidence. Given the importance

of the subject for the overall safety level of the airplane, the means of

compliance needs to be understood