AMC1 21.A.609(c) and (d) Obligations of holders of ETSO authorisations

• ED Decision 2021/007/R found in: Initial Airworthiness and Environmental Protection (748/2012) Part-21 Part-21L (Jul 2024)

AMC1 21.A.609(c) and (d) Obligations of holders of ETSO authorisations ED Decision 2021/007/R In CS-ETSO, there is no specification related to ICA, neither in Subpart A, nor in each specific ETSO. Although an ETSO article itself typically does not require ICA, the applicable airworthiness standards may require the design approval holder (DAH) or the design approval applicant (DAA) who install an ETSO article into their product to develop ICA that describe an ETSO article’s installation requirements, within the context of the product, to the extent necessary to ensure the product’s continued airworthiness. In addition, if the DAH or the DAA who install an ETSO article into their product explicitly uses ETSO provisions to demonstrate compliance with an installation requirement, they should review all the maintenance and inspection instructions for the particular ETSO article when defining the ICA of the product. It may be necessary for the DAH or the DAA to incorporate these instructions into the ICA of the product to ensure that the ETSO article continues to satisfy the terms of its ETSO authorisation after installation. Any DAH or DAA who wishes to install an ETSO article should comply with point [21.A.303](#_DxCrossRefBm1649097397). For this, the applicant for an ETSO authorisation may provide by the time of the application and before the authorisation is issued (in accordance with point [21.A.605](#_DxCrossRefBm1649096862)) the following: — instructions that cover periodic maintenance, calibration, and repair for the continued airworthiness of the article, including specific guidance on the limits of wear and damage that would warrant replacement; — the recommended inspection intervals, which may be affected by storage and operating conditions (i.e. temperature, humidity, etc.). ##### AMC1 21.A.609(c) and (d) Obligations of holders of ETSO authorisations *ED Decision 2021/007/R* In CS-ETSO, there is no specification related to ICA, neither in Subpart A, nor in each specific ETSO. Although an ETSO article itself typically does not require ICA, the applicable airworthiness standards may require the design approval holder (DAH) or the design approval applicant (DAA) who install an ETSO article into their product to develop ICA that describe an ETSO article’s installation requirements, within the context of the product, to the extent necessary to ensure the product’s continued airworthiness. In addition, if the DAH or the DAA who install an ETSO article into their product explicitly uses ETSO provisions to demonstrate compliance with an installation requirement, they should review all the maintenance and inspection instructions for the particular ETSO article when defining the ICA of the product. It may be necessary for the DAH or the DAA to incorporate these instructions into the ICA of the product to ensure that the ETSO article continues to satisfy the terms of its ETSO authorisation after installation. Any DAH or DAA who wishes to install an ETSO article should comply with point [21.A.303](#_DxCrossRefBm485230889). For this, the applicant for an ETSO authorisation may provide by the time of the application and before the authorisation is issued (in accordance with point [21.A.605](#_DxCrossRefBm485230352)) the following: — instructions that cover periodic maintenance, calibration, and repair for the continued airworthiness of the article, including specific guidance on the limits of wear and damage that would warrant replacement; — the recommended inspection intervals, which may be affected by storage and operating conditions (i.e. temperature, humidity, etc.).