21.A.90A Scope

The term ‘changes to the type certificate’ is consistently used in Part 21 Subpart D and E, as well as in the related AMC and GM. This term does not refer to changing the document that reflects the type certificate (TC) but to the elements of the TC as defined in 21.A.41. It means that the processes for the approval of changes, as described in the said two Subparts, do not only apply to changes to the type design, but may also apply to changes to: the operating limitations; the type certificate data sheet (TCDS) for airworthiness and emissions; the applicable type-certification basis and environmental protection requirements with which the applicant has to demonstrate compliance; any other conditions or limitations prescribed for the product by EASA; the applicable operational suitability data (OSD) certification basis; the OSD; and the TCDS for noise. NOTE: OSD is only applicable to aircraft TCs and not to engine or propeller TCs. Therefore, changes to OSD are only relevant for changes to aircraft TCs.